Furuno Radar Detector FR 2105 User Manual

New standard of marine radar technology through  
50 years of FURUNO’s marine electronics activities  
21” MULTI-COLOR HIGH-PERFORMANCE  
SHIPBORNE RADAR AND ARPA  
MODEL FR-2105/2105-B SERIES  
FURUNO ELECTRIC CO., LTD.  
NISHINOMIYA, JAPAN  
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SAFETY INSTRUCTIONS  
DANGER  
Before turning on the radar, make sure that there is no one near the  
scanner unit.  
Serious injury or even death may result if a rotating antenna strikes  
someone standing nearby.  
WARNING  
Radio Frequency Radiation Hazard  
The radar antenna emits electromagnetic radio frequency (RF) energy which can be  
harmful, particularly to your eyes. Never look directly into the antenna aperture from a  
close distance while the radar is in operation or expose yourself to the transmitting  
antenna at a close distance.  
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WARNING  
ELECTRICAL SHOCK HAZARD  
Do not open the equipment.  
WARNING  
Do not place liquid-filled containers on  
the top of the equipment.  
Only qualified personnel  
should work inside the  
equipment.  
Fire or electrical shock can result if a liquid  
spills into the equipment.  
Do not operate the equipment with wet  
hands.  
Turn off the radar power  
switch before servicing the  
scanner unit. Post a warn-  
ing sign near the switch  
indicating it should not be  
turned on while the scanner  
unit is being serviced.  
Electrical shock can result.  
Keep heater away from equipment.  
Heat can alter equipment shape and melt  
the power cord, which can cause fire or  
electrical shock.  
Prevent the potential risk of  
being struck by the rotating  
scanner and exposure to  
RF radiation hazard.  
Wear a safety belt and hard  
hat when working on the  
scanner unit.  
CAUTION  
Do not use the equipment for other than  
its intended purpose.  
Serious injury or death can  
result if someone falls from  
the radar scanner mast.  
Use of the equipment as a stepping stool,  
for example, can result in personal injury  
or equipment damage.  
Do not disassemble or modify the  
equipment.  
No one navigation device should ever be  
solely replied upon for the navigation of  
a vessel.  
Fire, electrical shock or serious injury can  
result.  
Turn off the power immediately if water  
leaks into the equipment or the equip-  
ment is emitting smoke or fire.  
Always confirm position against all available  
aids to navigation, for safety of vessel and  
crew.  
Continued use of the equipment can cause  
fire or electrical shock.  
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ARPA Safety Instructions  
CAUTION  
The plotting accuracy and response of  
this auto plotter meets IMO standards.  
Tracking accuracy is affected by the  
following:  
WARNING  
No one navigational aid should be relied  
upon for the safety of vessel and crew.  
The navigator has the responsibility to  
check all aids available to confirm  
position. Electronic aids are not  
Tracking accuracy is affected by course  
change. One to two minutes is required to  
restore vectors to full accuracy after an  
abrupt course change. (The actual  
amount depends on gyrocompass  
specifications.)  
The amount of tracking delay is inversely  
proportional to the relative speed of the  
target. Delay is on the order of 15—30  
seconds for high relative speed; 30—60  
seconds for low relative speed.  
a substitute for basic navigational  
principles and common sense.  
This auto plotter automatically tracks an  
automatically or manually acquired radar  
target and calculates its course and  
speed, indicating them by a vector. Since  
the data generated by the auto plotter  
are based on what radar targets are  
selected, the radar must always be  
optimally tuned for use with the auto  
plotter, to ensure required targets will not  
be lost or unwanted targets such as sea  
returns and noise will not be acquired  
and tracked.  
Display accuracy is affected by the  
following:  
Echo intensity  
Radar transmission pulsewidth  
Radar bearing error  
A target does not always mean a land-  
mass, reef, ships or other surface vessels  
but can imply returns from sea surface  
and clutter. As the level of clutter changes  
with environment, the operator should  
properly adjust the A/C SEA, A/C RAIN  
and GAIN controls to be sure target  
echoes are not eliminated from the  
radar screen.  
Gyrocompass error  
Course change (own ship or target)  
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Several labels are attached to the display  
unit and scanner unit.Do not remove these labels.  
If a label is peeling off or is illegible, contact a  
FURUNO agent or dealer.  
<Display Unit>  
Name: Warning Label (1)  
Type: 86-003-1011-0  
Code no.: 100-236-230  
WARNING  
To avoid electrical shock, do not  
remove cover. No user-serviceable  
parts inside.  
<Scanner Unit>  
Name: Radiation Warning  
WARNING  
Radiation hazard. Only qualified  
personnel should work inside scanner.  
Confirm that TX has stopped before  
opening scanner.  
Label  
Type: 03-142-3201-0  
Code no.: 100-266-890  
<Inside of the Display Unit>  
ARNING  
WARNING  
Possibility of injuly.  
WARNING  
Display unit may fall.  
Lock stay before  
servicing.  
Hold handle when  
mounting display unit.  
Name : Warning Label  
Type : 03-144-1332  
Name : Warning Label  
Type : 03-144-1333  
Code No. : 100-266-290  
Code No. : 100-266-300  
ANGER  
ANGER  
DANGER  
DANGER  
ANGER  
DANGER  
Electrical shock hazard.  
Turn off power before  
servicing.  
Electrical shock hazard.  
Do not touch anode cap  
or its cable.  
Electrical shock hazard.  
Do not touch parts inside  
this cover.  
Name : Danger Label  
Type : 14-055-4202  
Code No. : 100-245-220  
Name : Danger Label  
Type : 14-055-4201  
Code No. : 100-243-450  
Name : Danger Label  
Type : 66-022-2012  
Code No. : 100-237-730  
iv  
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TABLE OF CONTENTS  
INTRODUCTION ...........................................................................................................................................viii  
A WORD TO THE OWNER OF FURUNO RADAR................................................................................................. VIII  
SPECIFICATIONS OF FR-2105/2105-B SERIES RADAR AND ARPA.......................................................................XI  
CHAPTER 1 OPERATION............................................................................................................................1.1  
1.1 TURNING ON THE POWER ..............................................................................................................................1  
1.2 TRANSMITTER ON.........................................................................................................................................2  
1.3 CONTROL HEAD............................................................................................................................................3  
1.4 CRT BRILLIANCE ..........................................................................................................................................5  
1.5 TUNING THE RECEIVER .................................................................................................................................5  
1.6 ON-SCREEN LEGENDS AND MARKERS............................................................................................................7  
1.7 DEGAUSSING THE CRT SCREEN....................................................................................................................9  
1.8 INITIALIZING THE GYRO READOUT..................................................................................................................9  
1.9 PRESENTATION MODES...............................................................................................................................10  
1.10 SELECTING THE RANGE SCALE..................................................................................................................13  
1.11 SELECTING THE PULSELENGTH..................................................................................................................13  
1.12 ADJUSTING THE SENSITIVITY .....................................................................................................................16  
1.13 SUPPRESSING SEA CLUTTER.....................................................................................................................16  
1.14 SUPPRESSING PRECIPITATION CLUTTER ....................................................................................................18  
1.15 INTERFERENCE REJECTOR ........................................................................................................................18  
1.16 MEASURING THE RANGE ...........................................................................................................................19  
1.17 MEASURING THE BEARING.........................................................................................................................21  
1.18 COLLISION ASSESSMENT BY OFFSET EBL .................................................................................................22  
1.19 MEASURING RANGE AND BEARING BETWEEN TWO TARGETS......................................................................23  
1.20 SETTING A TARGET ALARM ZONE ..............................................................................................................23  
1.21 OFF-CENTERING.......................................................................................................................................25  
1.22 ECHO STRETCH ........................................................................................................................................26  
1.23 ECHO AVERAGING.....................................................................................................................................27  
1.24 ELECTRONIC PLOTTING AID (EPA) ............................................................................................................29  
1.25 ENTERING OWN SHIP'S SPEED....................................................................................................................33  
1.26 TARGET TRAILS (ECHO TRAILS).................................................................................................................35  
1.27 PARALLEL INDEX LINES .............................................................................................................................38  
1.28 ORIGIN MARK ...........................................................................................................................................40  
1.29 ZOOM.......................................................................................................................................................41  
1.30 MARKERS.................................................................................................................................................42  
1.31 MENU KEYS..............................................................................................................................................43  
1.32 RADAR 1, 2 AND 3 MENU SETTINGS ........................................................................................................44  
1.33 FUNCTION KEYS .......................................................................................................................................46  
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1.34 BARGE INFORMATION................................................................................................................................52  
1.35 RADAR MAP..............................................................................................................................................52  
1.36 SUPPRESSING SECOND-TRACE ECHOES ....................................................................................................57  
1.37 DISPLAYING EXTERNAL WAYPOINT AND NAVIGATION LINE ..........................................................................57  
1.38 ADJUSTING BRILLIANCE OF SCREEN DATA .................................................................................................58  
1.39 DISPLAY OF WIND/TIDE/DEPTH INFORMATION ............................................................................................59  
1.40 ALARMS....................................................................................................................................................61  
CHAPTER 2 OPERATION OF ARPA (OPTION) .........................................................................................2.1  
2.1 GENERAL .....................................................................................................................................................1  
2.2 KEYPADS FOR ARPA....................................................................................................................................2  
2.3 ARPA MENU OPERATION .............................................................................................................................3  
2.4 START-UP PROCEDURE.................................................................................................................................4  
2.5 AUTOMATIC ACQUISITION ..............................................................................................................................6  
2.6 MANUAL ACQUISITION .................................................................................................................................10  
2.7 CHANGING PLOT SYMBOL SIZE....................................................................................................................11  
2.8 ADJUSTING BRILLIANCE OF PLOT MARKS .....................................................................................................14  
2.9 DISPLAYING TARGET DATA..........................................................................................................................14  
2.10 VECTOR MODES........................................................................................................................................15  
2.11 PAST POSITION DISPLAY...........................................................................................................................16  
2.12 SET AND DRIFT (SET AND RATE) ...............................................................................................................17  
2.13 SETTING CPA/TCPA ALARM RANGES.......................................................................................................18  
2.14 SETTING A GUARD ZONE...........................................................................................................................19  
2.15 OPERATIONAL WARNINGS .........................................................................................................................21  
2.16 TRIAL MANEUVER .....................................................................................................................................23  
2.17 ARPA PERFORMANCE TEST .....................................................................................................................25  
2.18 CRITERIA FOR SELECTING TARGETS FOR TRACKING...................................................................................26  
2.19 FACTORS AFFECTING ARPA FUNCTIONS...................................................................................................28  
CHAPTER 3 RADAR OBSERVATION.........................................................................................................3.1  
3.1 GENERAL .....................................................................................................................................................1  
3.2 FALSE ECHOES.............................................................................................................................................3  
3.3 SART (SEARCH AND RESCUE TRANSPONDER) ..............................................................................................3  
3.4 RACON (RADAR BEACON)............................................................................................................................7  
CHAPTER 4 OPERATION OF VIDEO PLOTTER .....................................................................................4.1  
4.1 GENERAL .....................................................................................................................................................1  
4.2 THE VIDEO PLOTTER DISPLAY.......................................................................................................................2  
4.3 DISPLAY MODES ...........................................................................................................................................2  
4.4 SET- UP OF VIDEO PLOTTER DISPLAY............................................................................................................4  
4.5 TRACK..........................................................................................................................................................5  
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4.6 MARKS, LINES ..............................................................................................................................................8  
4.7 WAYPOINTS..................................................................................................................................................9  
4.8 NAVIGATION LINES......................................................................................................................................12  
4.9 RECORDING & REPLAYING DATA .................................................................................................................14  
4.10 PLOTTER PRESENTATION MODE ................................................................................................................16  
4.11 INITIAL SETTINGS ......................................................................................................................................17  
4.12 LATITUDE ERROR TABLE (ON 96 NM RANGE SCALR).........................................................17  
CHAPTER 5  
MAINTENANCE..................................................................................................................5.1  
5.1 PERIODIC MAINTENANCE SCHEDULE..............................................................................................................1  
5.2 LIFE EXPECTANCY OF MAJOR PARTS .............................................................................................................2  
5.3 REPLACEMENT OF BATTERY ..........................................................................................................................2  
CHAPTER 6  
TROUBLESHOOTING........................................................................................................6.1  
6.1 EASY TROUBLESHOOTING .............................................................................................................................1  
6.2 ADVANCED-LEVEL TROUBLESHOOTING...........................................................................................................2  
6.3 DIAGNOSTIC TEST.........................................................................................................................................4  
CHAPTER 7  
CHAPTER 8  
MENU OVERVIEW..............................................................................................................7.1  
ANLILLARY EQUIPMENT..................................................................................................8.1  
8.1 PERFORMANCE MONITOR ..............................................................................................................................1  
8.2 INTERSWITCHING UNIT...................................................................................................................................3  
8.3 FOR FISHING VESSEL....................................................................................................................................4  
CHAPTER 9  
DIGITAL INTERFACE (IEC61162-1)..................................................................................9.1  
CHAPTER 10 PARTS LIST AND MAJOR PARTS LOCATION .............................................................10.1  
Declaration of Conformity to Type (FR-21X5 series)  
Declaration of Conformity (FR-2155, FR-2165DS)  
vii  
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INTRODUCTION  
A Word to the Owner of FURUNO Radar  
Thank you for purchasing this FURUNO radar. We are confident you will discover why  
FURUNO has become synonymous with quality and reliability.  
Dedicated in the design and manufacture of marine electronics equipment for half a century,  
FURUNO Electric Company has gained an unrivaled reputation as a world leader in the  
industry. This is the result of our technical excellence as well as our worldwide distribution and  
service network.  
Please carefully read and follow the safety information and operating and maintenance  
instructions set forth in this manual before attempting to operate the equipment and conduct  
any maintenance. Your radar set will perform to the utmost of its ability only if it is operated  
and maintained in accordance with the correct procedures.  
FEATURES OF THIS SERIES OF RADARS AND ARPAs  
Daylight-bright rasterscan 21-inch multi-color, high-resolution display  
New microprocessing technology with high-speed high-density gate array and software  
expertise  
New cast aluminum scanner gearbox and new series of radiators  
Easy operation by combination of discrete keys, rotary controls, and menu operation, all  
logically arranged and configured  
Electronic Plotting Aid (EPA) fitted standard, Automatic Radar Plotting Aid (ARPA) option  
exceeding IMO and IEC standards .  
Reliable CPA and TCPA warning in any plotting mode, accurate target data.  
Stand-alone or integrated configuration  
Meets IMO MSC.64 (61) and IEC A.823 : 1996 as a shipborne radar, high speed craft radar  
A.820 (19), and ARPA A.823 (19).  
viii  
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FR-2105/2105-B Series of Radars and ARPAs  
The FURUNO FR-2105/2105-B Series of radars and ARPAs are designed to meet various  
customers’ needs and the exacting requirements of international and national standards and  
regulations including:  
- IMO A.477(XII):  
Performance Standards for Radar Equipment (up to 31.12.1998)  
- IMO MSC.64(67) Annex 4: Performance Standards for Radar Equipment (1.1.1999 and after)  
- IEC 60936-1:  
Shipborne Radar Operational and Performance Requirement (1.1.1999 and  
after)  
- IMO A.823(19): Performance standards for Automatic Radar Plotting Aids (ARPAs) (1.1.1997  
and after)  
- IEC 60872-1:  
Automatic Radar Plotting Aids (ARPAs) (1.1.1997 and after)  
- IEC 60945: 1996-11(3rd Ed) Marine Navigational Equipment General Requirements  
- IMO A.820(19): Performance standards for navigational radar equipment for high speed craft  
(1.1.1996 and after)  
- IEC 60936-2:  
Performance standards for navigational radar equipment for high speed craft  
Models  
This series of radar and ARPA is available in the following models:  
Model  
Freq Band  
X-band  
X-band  
X-band  
X-band  
S-band  
Output  
12 kW  
25 kW  
25 kW  
50 kW  
30 kW  
30 kW  
60 kW  
Transceiver configuration  
TR-up  
TR-up  
TR-down  
TR-up  
TR-up  
FR-2115,FR-2115-B  
FR-2125, FR-2125-B  
FR-2125W, FR-2125W-B  
FR-2155, FR-2155-B  
FR-2135S, FR-2135S-B  
FR-2135SW, FR-2135SW-B S-band  
FR-2165DS S-band  
TR-down  
TR-up  
Note: FR-2155, FR-2155-B, FR-2165DS are not IMO type-approved models.  
All comes with the EPA (Electronic Plotting Aid) standard fitted. An optional ARP-26 board is  
available to provide the full functionality of ARPA (Automatic Radar Plotting Aid). Also with  
an optional Video Plotter RP-26 board.  
Besides the choice of the above models, the FR-2105/2105-B Series is available in the Regular  
type (R-type) and IMO type. The IMO type is designed as a primary radar under the 1974  
SOLAS Convention on ships below 10,000 GT and also as a high speed craft radar when fitted  
with ARPA function (at least ATA by IEC 60936-2). The R-type satisfies the IMO and IEC  
standards but includes more flexibility of functionality to meet the fishing boats particularly  
(thus, this is an expanded type in other word).  
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The table below shows the differences between R-type and IMO type radars. Other functions  
and specifications are common. The operator cannot navigate between these two types. Your  
radar is factory set for IMO type. If you want an R-type, please ask your service representative.  
Function  
IMO type  
Regular type (R-type), Japanese  
version  
Range scales  
0.125, 0.25, 0.5, 0.75, 1.5, 3, 6, 12,  
24, 48, 96 nm  
FR-2115/2115-B:  
0.125, 0.25, 0.5, 0.75, 1.5, 3, 6, 12,  
24, 48, 72 nm  
Other models:  
0.125, 0.25, 0.5, 0.75, 1.5, 3, 6, 12,  
24, 48, 120 nm  
Alarm zones  
Radar: Target Alarm Zone:  
Radar: Target Alarm Zone:  
1st TAZ between 3 and 6 nm, 2nd  
1st and 2nd TAZs anywhere. Alarm  
TAZ anywhere provided the 1st TAZ can be selected for inside (as TAZ) or  
is valid.  
outside (as off-zone watch) mode.  
ARPA: Guard Zones:  
ARPA: Guard Zones:  
1st GZ - between 3 and 6 nm, in 0.5  
nm range depth  
1st GZ - Anywhere in 0.5 nm depth  
2nd GZ - Anywhere in 0.5 nm range  
depth, but needs 1st GZ operative  
2nd GZ - Anywhere in 0.5 nm depth  
Available on menu  
x2 Zoom  
Not available  
Echo colors  
Monochrome yellow or green in 16  
tones  
Choice of monochrome in 16 tones or  
3 colors depending on echo strengths  
Program number  
MAIN 0359149103  
ARPA 1859038103  
DISP  
RP  
1859039101  
0359150102  
(See page 6.6 to confirm this on the screen.)  
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Specifications of FR-2105/2105-B Series Radar and ARPA  
ANTENNA RADIATOR  
*: In case of FR-2155/2165DS/2155-B, 0.3 is replaced  
with 0.2.  
1. Type  
Slotted waveguide array  
2. Beamwidth and sidelobe attenuation  
4. IF  
5. Noise figure  
6. Duplexer  
60 MHz, Logarithmic. BW 28/3 MHz  
6 dB  
Ferrite circulator with diode limiter for  
FR-2115/2125/2135S/2135SW/  
2115-B/2125-B/2135S-B/  
2135SW-B/2165DS.  
Ferrite circulator with TR limiter for  
FR-2155/2155-B/2125W/2125W-B.  
X-band  
S-band  
Radiator  
Type  
XN12AF  
XN20AF  
XN24AF  
SN30AF  
SN36AF  
Length (mm)  
Beamwidth  
(H)  
1260  
1.8°  
2040  
1.23°  
2550  
0.95°  
3090  
2.5°  
3765  
2.1°  
Beamwidth  
(V)  
20°  
20°  
20°  
25°  
25°  
Sidelobe att.  
28 dB  
32dB  
28 dB  
32 dB  
28 dB  
32dB  
24dB  
30 dB  
24 dB  
30 dB  
DISPLAY  
1. Picture tube  
Within ±10°  
Sidelobe att.  
Outside ±10°  
21” multi-color, 1280 x 1024 pixels,  
Rasterscan non-interlace at 61.44  
kHz hor, 60 Hz vert.  
*
SN30AF is available for non-SOLAS ship or for HSC  
radar (FR-2135S)  
Effective display diameter 275 mm  
3. Rotation  
. FR-2115/2125/2115-B/2125-B: 24/42 rpm  
IMO type  
Yellow or green echoes in 16 levels.  
Echoes in the same color in 16  
graduation for smooth display.  
Different colors for marks, legends,  
alarms to ensure easy observation.  
Yellow or green echoes in 16 levels  
or 3 colors depending on echo  
strengths  
. FR-2125W/2135SW/2125W-B/2135SW-B:  
26 rpm (60 Hz), 21 rpm (50 Hz)  
. FR-2135S/2135S-B:  
26 rpm (60 Hz), 21 rpm (50Hz), 45 rpm (for HSC)  
. FR-2155/2155-B: 20 rpm (DC and 60 Hz),  
16 rpm (50 Hz)  
Regular type  
. FR-2165DS: 24 rpm  
2. Minimum range and discrimination  
Meets 35 m HSC requirements  
3. Range scales 0.125, 0.25, 0.5, 0.75, 1.5, 3, 6, 12,24,  
48, 96  
Note: Max. range for Japanese version is  
FR-2115/2115-B: 72 nm, Other: 120 nm  
4. Range accuracy 1% of range or 15 m, whichever is  
the greater  
5. Bearing discrimination Better than 2.5° except 9 ft  
S-band radiator. Accuracy ±1°  
RF TRANSCEIVER  
1. Frequency  
X-band  
9410 MHz ± 30 MHz (12, 25 kW)  
9415 MHz ± 30 MHz (50 kW)  
3050 MHz ± 30 MHz (35, 60 kW)  
S-band  
2. Output power  
FR-2115/2115-B : 12 kW,  
FR-2125/2125W/2125-B/2125W-B: 25 kW,  
FR-2155/2155-B: 50 kW  
6. Presentation  
Head-up, Head-up TB, North-up, TM  
Sea or ground stabilization  
FR-2165DS: 60 kW,  
FR-2135S/2135SW/2135S-B/2135SW-B: 30 kW  
3. Pulselengths and PRR  
7. Plotting facilities  
EPA  
10 targets manual plotting (standard).  
Not operational in ARPA mode.  
Automatic Radar Plotting Aid for 30  
targets automatically or manually  
acquired, dynamic and static trial  
maneuver, complies with A.823(19).  
<FR-2115/2125/2115-B/2125-B>  
Range scales  
P/L (µs)  
PRR (Hz)  
3000  
ARPA  
0.125, 0.25  
0.5  
0.07  
0.07.0.15  
3000  
0.75, 1.5  
3
2 from 0.07/0.15/0.3  
3000/1500  
2 from 0.15/0.3/0.5/0.7 3000/1500  
2 from 0.3/0.5/0.7/1.2 1500/1000  
Common features Sea and ground stabilized vectors  
and target trails, 3 target data readout  
at a time  
6
12, 24  
48, 96  
2 from 0.5/0.7/1.2  
1.2  
1000/600  
600/500  
8. Radar map  
Nav lines, coastlines, buoys, etc.  
produced by operator as required by  
IMO and IEC standards. 150 points x  
10 areas stored in EEROM.  
2 GZs at 3 and 6 nm in width of 0.5  
nm, any sector, in ARPA mode.  
<FR-2155/2125W/2135S/2135SW/2165DS/  
2155-B/2125W-B/2135S-B/2135SW-B>  
Range scales  
P/L (µs)  
PRR (Hz)  
2200  
0.125, 0.25, 0.5 0.08  
9. Guard zone  
0.75, 1.5  
3
0.08/0.3*  
2200/1100  
2200/1100  
2200/1100  
1100/600  
600/500  
10. Target alarm zone 1st zone within 3-6 nm, 2nd zone  
anywhere  
11. Target trails  
2 from 0.08/0.3*/0.6  
2 from 0.08/0.3*/0.6  
0.6/1.2  
6
Plotted in light blue not to interfere  
with radar picture, intervals 15, 30 s,  
1, 3, 6, 15, 30 min, true or relative on  
RM mode; true only in TM mode.  
12, 24  
48, 96  
1.2  
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12. Parallel index line Choice of 2, 3 or 6 lines  
8 ARPA board ARP-26 (Mandatory on HSC)  
9 Video plotter board RP-26  
INTERFACE  
IEC 61162-1  
10 ROM card (for digital charts), RAM card (for custom  
data) for RP-26, expanded radar map  
11 Sub display FMD-8001 (R-type)  
OSD, RSD, TTM, etc.  
(LISTENER 2 mA at 2 V, TALKER  
60 mA max.)  
Analog  
RGB video, H/V sync for VDR with  
optional interface board  
Built-in interface for sync signal  
20-50 V, 50-400 Hz, or stepper  
20-50 V  
POWER SUPPLY  
FR-2115/2115-B:  
24 V, 9.6 A; 32 V, 7.2 A; 230 VAC, 2.4 A  
FR-2125/2125-B:  
24 V, 10.8 A; 32 V, 8.2 A; 230 VAC, 2.7 A  
FR-2135S/2135S-B:  
Gyrocompass  
Speed log  
IEC 61162-1, contact closure or  
200/400/500 pulses/nm  
Display/Transceiver unit 230 VAC, 2.1 A  
Antenna unit 200/220/380/440 VAC, 3ø,  
1.4 A  
EQUIPMENT LIST  
Standard  
FR-2155/2155-B:  
1 Display unit (Separated to Monitor, Processor unit and  
Control unit for –B type model)  
2 Antenna unit  
Display/Transceiver unit 230 VAC, 5.7 A  
Antenna unit 200/220 VAC, 0.7A;  
24 VDC, 0.6 A  
3 Transceiver unit for TR down version;  
FR-2125W/2135SW/2125W-B/2135SW-B  
4 Power supply unit for  
FR-2155/2135S/2135SW/2165DS/2155-B/  
2135S-B/2135SW-B/2165DS-B  
Option  
1 Waveguide for TR down version  
2 Gyro interface GC-8 (built-in type)  
3 Interswitch box RJ-7, RJ-8  
4 Performance monitor PM-30 (X), PM-50 (S)  
5 42 rpm scanner motor for HSC  
(FR-2115/2115B, 2125/2125B only)  
6 45 rpm scanner motor for HSC  
(FR-2135S/2135S-B only)  
FR-2165DS:  
Display/Transceiver unit 115 VAC, 5.7 A  
Antenna unit 24 VDC, 10.9A  
FR-2125W/2125W-B:  
Display/Transceiver unit 230 VAC, 2.1 A  
Antenna unit 200/220/380/440 VAC, 3ø,  
0.7 A  
FR-2135SW/2135SW-B:  
Display/Transceiver unit 115 VAC, 5.7 A  
Antenna unit 200/220/380/440 VAC, 3ø,  
1.4 A  
X-Radiation  
None of the equipment or any device used in  
it will not give rise to dose rate > 5 µJ/kgh (0.5  
mrem/h) at 50 mm.  
7 Interface unit IF-2300 (Mandatory for IMO radar)  
Electromagnetic radiofrequency radiation  
RF power density on  
antenna aperture  
MODEL  
RADIATOR TYPE Distance to 100 W/cm2 Distance to 10 W/cm2  
FR-2115  
XN12AF (4’)  
XN20AF (6.5’)  
0.1 m worst case  
3.5 m  
150 W/cm2  
FR-2115-B  
(X, 12 kW) XN24AF (8’)  
1.4 m  
70 W/cm2  
FR-2125/2125W  
FR-2125-B  
XN12AF (4’)  
1.1 m worst case  
10.0 m worst case 200 W/cm2 worst case  
XN20AF (6.5’)  
FR-2125W-B (X, 25 kW) XN24AF (8’)  
FR-2135S/2135SW  
FR-2135S-B  
FR-2135SW-B  
(S, 30 kW)  
SN30AF (10)  
-
0.7 m  
0.5 m  
SN36AF (12)  
FR-2165DS  
(S, 60 kW)  
SN4A (8’)  
SN5A (9’)  
XN4A (8’)  
-
-
1.2 m  
1.0 m  
0.7 m  
1.6 m  
FR-2155  
FR-2155-B (X, 50 kW) XN5A (10’)  
FR-2135S/2135SW SN-30AF: Not available in Japan.  
xii  
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Category of Equipment Units  
Display unit (Monitor, Processor unit, Control unit)  
To be installed in a Protected area  
Power supply unit  
RF Transceiver unit  
Antenna unit  
To be installed in a Protected area  
To be installed in a Protected area  
To be installed in an Exposed area  
Performance Monitor To be installed in an Exposed area  
Precautions for high speed targets  
Assume your ship is making 40 kt and a target ship is approaching at 40 kt right toward you.  
Then the relative speed is 80 kt. With the antenna revolving at 42 rpm, the target blip  
appears jumping to a new location 59 m nearer. This jump corresponds to 19 mm on the  
300 mm display using the 0.25 nm range scale. On such a short range you may lose the  
track of target in the midst of sea clutter, random noise or other targets. Use one step larger  
range scale.  
ARPA can fail to track a target when the relative speed exceeds 100 kt.  
xiii  
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CONFIGURATION OF FR-2105 SERIES RADAR AND ARPA  
Your RADAR or ARPA is model FR-21xx  
consisting of checked component units. (Check by yourself or your service representative)  
FR-2115/2125  
FR-2155/2135S/2165DS  
FR-2125W/2135SW  
ANTENNA UNIT  
ANTENNA UNIT  
ANTENNA UNIT  
Performance Monitor (option)  
PM-30 for X-band  
Waveguide or  
Coax cable  
PM-50 for S-band  
TRANSCEIVER UNIT  
For FR-2125W/2135SW  
Power Supply  
Unit PSU-001  
(For FR-2155/2165DS)  
DISPLAY UNIT  
RDP-124  
Gyro  
Converter  
Gyro Interface  
Gyro  
ARPA board  
ARP-26  
Power Supply  
Unit PSU-004  
115/230 VAC,  
1φ, 50/60 Hz  
SDME (pulse)  
Video Plotter  
RP-26  
EPFS  
SDME (VBW)  
GYRO (HDT)  
Power Supply  
Unit PSU-004  
Interface  
IF-2300  
ARPA data (TTM)  
External Buzzer  
Other Radar system  
Interswitch  
115/230 VAC, 1φ, 50/60 Hz  
(Ant and disp for FR-2115/2125)  
Display unit  
Display unit  
115/230 VAC, 1φ, 50/60 Hz (FR-2125W/2135SW)  
Antenna unit  
115/230 VAC, 1φ, 50/60Hz  
115 VAC, 1φ, 50/60 Hz (FR-2155/2165DS)  
Antenna unit  
See the table in below  
See the table in below  
Optional Supply  
Power  
Please specify power supply when ordering.  
Optional transformer is required for other mains.  
ANTENNA UNIT  
FR-2115  
FR-2115-B  
RSB-0074 (24 rpm, 24VDC): Motor D8G-516  
RSB-0075 (42 rpm, 24VDC): Motor D8G-571 --- HSC X-band  
FR-2125  
RSB-0074 (24 rpm, 24VDC): Motor D8G-516  
FR-2125-B  
FR--2155  
FR-2155-B  
FR-2125W  
FR-2125W-B  
RSB-0075 (42 rpm, 24VDC): Motor D8G-571571 --- HSC X-band  
RSB-0049 (16 rpm (50Hz)/20 rpm (60 Hz), 200/220 VAC, 3ø: Motor GOB-8222  
RSB-0050 (20 rpm, 24VDC): Motor RM-6585  
RSB0076 (21 rpm (50Hz)/26 rpm (60Hz), 200/220 VAC, 3ø): Motor RM-8123  
RSB0077 (21 rpm (50Hz)/26 rpm (60Hz), 380/440 VAC, 3ø): Motor RM-8124  
RSB0078 (21 rpm (50Hz)/26 rpm (60Hz), 100 VAC, 1ø): Motor RM-8247  
RSB0026 (21 rpm (50Hz)/26 rpm (60Hz), 200/220 VAC, 3ø): Motor RM-7398  
RSB0031 (21 rpm (50Hz)/26 rpm (60Hz), 380/440 VAC, 3ø): Motor RM-7435  
RSB0088(45 rpm, 220 VAC, 3ø 50Hz): Motor RM-9519 --- HSC S-band  
RSB0089 (45 rpm, 220 VAC, 3ø 60Hz): Motor RM-9520 --- HSC S-band  
RSB0090 (45 rpm, 440 VAC, 3ø 60Hz): Motor RM-9521 --- HSC S-band  
RSB0027 (21 rpm (50Hz)/26 rpm (60Hz), 200/220 VAC, 3ø: Motor RM-7398  
RSB0032 (21 rpm (50Hz)/26 rpm (60Hz), 380/440 VAC, 3ø: Motor RM-7435  
RSB0051 (21 rpm, 24 VDC): Motor RM-6585  
FR-2135S  
FR-2135S-B  
FR-2135SW  
FR-2135SW-B  
FR-2165DS  
xiv  
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CONFIGURATION OF FR-2105-B SERIES RADAR AND ARPA  
Your RADAR or ARPA is model FR-21xx  
-B  
consisting of checked component units. (Check by yourself or your service representative)  
FR-2115-B/2125-B  
FR-2155-B/2135S-B  
FR-2125W-B/2135SW-B  
ANTENNA UNIT  
ANTENNA UNIT  
ANTENNA UNIT  
Performance Monitor (option)  
PM-30 for X-band  
Waveguide or  
Coax cable  
PM-50 for S-band  
TRANSCEIVER UNIT  
For FR-2125W/2135SW  
Power Supply  
Unit PSU-001  
(For FR-2155-B)  
MONITOR  
RDP-124-M-ES  
CONTROL UNIT  
RCU-011  
Processor unit  
RPU-011  
Gyro  
Converter  
Gyro Interface  
Gyro  
ARPA board  
ARP-26  
Power Supply  
Unit PSU-004  
115/230 VAC,  
1φ, 50/60 Hz  
SDME (pulse)  
EPFS  
Video Plotter  
RP-26  
Power Supply  
Unit PSU-004  
SDME (VBW)  
GYRO (HDT)  
Interface  
IF-2300  
ARPA data (TTM)  
External Buzzer  
Interswitch  
RJ-7/RJ-8  
Other Radar system  
115/230 VAC, 1φ, 50/60 Hz  
Display unit  
Display unit (Ant and disp for FR-2115-B/2125-B)  
115/230 VAC, 1φ, 50/60 Hz (FR-2125W-B/2135SW-B)  
115/230 VAC, 1φ, 50/60Hz  
115 VAC, 1φ, 50/60 Hz (FR-2155-B)  
Antenna unit  
200 VAC, 3φ, 50 Hz (FR-2135S-B)  
220 VAC, 3φ, 60 Hz (FR-2155-B/2135S-B)  
380 VAC, 3φ, 50 Hz (FR-2135S-B)  
440 VAC, 3φ, 60 Hz (FR-2135S-B)  
Antenna unit  
230 VAC, 1φ, 50/60 Hz (FR-2125W-B)  
220 VAC, 3φ, 60 Hz (FR-2135SW-B)  
380 VAC, 3φ, 50 Hz (FR-2125W-B/2135SW-B)  
440 VAC, 3φ, 60 Hz (FR-2125W-B/2135SW-B)  
Optional Supply  
Power  
Please specify power supply when ordering.  
Optional transformer is required for other mains.  
Note: The Display unit RDP-124 for FR-2105 series radar is separated into the Monitor  
RDP-124-M-ES, the Processor unit RPU-011 and the Control unit RCU-011 for FR-2105-B  
series radar.  
xv  
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Chapter 1 OPERATION  
DANGER  
Before turning on the radar, make sure that there is no one near the  
antenna unit.  
Serious injury or even death may result if a rotating antenna strikes  
someone standing nearby.  
Power switch  
Control head  
1.1 Turning on the Power  
The POWER switch is located at the left corner of the control head. Push it to switch on the  
radar system. To turn off the radar, push it again. The screen shows the bearing scale and  
digital timer in approximately 15 seconds after power-on. The timer counts down three  
minutes of warm-up time. During this period the magnetron, i.e., transmitter tube, is warmed  
for transmission. When the timer has reached 0:00, the indication STBY appears indicating  
that the radar is now ready to transmit pulses.  
In warm-up and standby condition, you will see the message BRG SIG MISSING. This is  
normal because a bearing (azimuth) signal is not yet generated when the antenna is not  
rotating. ON TIME and TX TIME values shown at the bottom of the screen are the time  
counts in hours and tenths of hour when the radar has been powered.  
-1.1-  
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1.2 Transmitter ON  
When the STANDBY status is displayed on the screen, press the transmit switch labeled  
STBY/TX on the control panel of the display unit.  
The radar is initially set to previously used range and pulsewidth. Other settings such as  
brilliance levels, VRMs, EBLs and menu option selections are also set to previous settings.  
The transmit switch toggles the radar between STANDBY and TRANSMIT status. The  
antenna stops in STANDBY status and rotates in TRANSMIT status.  
Quick Start  
Provided that the radar was once in use with the transmitter tube (magnetron) still warm, you  
can turn the radar into TRANSMIT condition without 3-minutes standby. If the Power Switch  
has been turned off by mistake or the like and you wish to restart the radar promptly, turn on  
the Power Switch not later than 10 seconds after power-off.  
Notes:  
1) If the antenna does not rotate in TRANSMIT status, check whether the antenna switch in  
the tuning compartment is in the OFF position.  
2) The magnetron ages with time resulting in a reduction of output power. It is highly  
recommended that the radar be set to STANDBY status when not used for an extended  
period of time.  
-1.2-  
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1.3 Control Head  
AUDIO OFF  
Acknowledges audible alarms, no effect on  
visual alarms.  
RADAR MENU  
for setting various parameters for  
radar operation and radar map.  
A/C RAIN  
Suppresses clutter from  
rain, snow, clouds.  
A/C SEA  
Suppresses sea clutter to  
improve the short range  
discrimination.  
NAV MENU  
Sets parameters for nav info.  
BRILLIANCE  
Adjusts the brightness  
of entire screen.  
PLOT MENU  
for plotting  
GAIN  
Adjusts the radar sensitivity.  
POWER  
HL  
OFF  
PANEL  
MODE  
3
AUDIO  
OFF  
RADAR  
MENU  
PLOT  
MENU  
NAV  
MENU  
BRILL  
2
1
OFF  
LOST  
VECTOR  
5
BRILLIANCE  
A/C RAIN  
A/C SEA  
GAIN  
CENTER  
TARGET  
ON  
OFF  
4
6
PM  
ACQ  
ANTENNA  
CHART  
ALIGN  
EBL  
7
MARK  
9
#1  
#3  
#2  
STBY  
TX  
TARGET  
DATA  
8
OFF  
ON  
OFF  
ON  
TUNE  
TARGET  
TRAILS  
CU, TM  
RESET  
A/C  
AUTO  
TARGET  
CANCEL  
EBL  
RANGE  
VRM  
#4  
DEGAUSS ERROR  
CANCEL  
0
ENTER  
EBL control and on/off keys  
Pressing ON key toggles  
between NO.1 and NO.2  
EBLs.  
VRM control and on/off keys  
Pressing ON key toggles  
between NO.1 and NO.2  
VRMs.  
TRACKBALL  
Shifts the cursor for plotting,  
entering reference points,  
etc.  
FUNCTION Keys  
#1: Set-up 1  
#2: Set-up 2  
#3: Set-up 3  
#4: Set-up 4  
TRANSMIT/STANDBY  
RANGE Keys  
Select the range scales.  
-1.3-  
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(3)  
(2)  
(1)  
(12)  
HL  
PANEL  
BRILL  
AUDIO  
OFF  
RADAR  
MENU  
PLOT  
MENU  
NAV  
MENU  
MODE  
3
OFF  
1
2
OFF  
LOST  
VECTOR  
5
(13)  
(4)  
(5)  
CENTER  
TARGET  
4
6
ACQ  
(8)  
EBL  
OFFSET  
CHART  
ALIGN  
MARK  
9
7
8
TARGET  
DATA  
(9)  
TARGET  
TRAILS  
CANCEL  
CU, TM  
RESET  
A/C  
AUTO  
TARGET  
CANCEL  
(10)  
0
ENTER  
(15)  
(7),  
(11)  
(6) (14)  
(16)  
1 MODE Selects presentation modes: Head-up, Head-up TB, North-up, Course-up and True  
Motion.  
2 PANEL BRILL Adjusts brightness of control panel.  
3 HL OFF Temporarily erases the heading line.  
4 OFF-CENTER Activates and deactivates off-centering of the own ship position.  
5 EBL OFFSET Activates and deactivates off-centering of the EBL origin.  
6 C U, TM RESET Resets the heading line to 000° in course-up mode; moves own ship  
position to 75% radius in stern direction in the True Motion mode.  
7 A/C AUTO Reduces sea clutter at preset level. Permits manual override by A/C SEA and  
A/C RAIN controls.  
11 TARGET TRAILS CANCEL Erases target trails.  
Keys for EPA or ARPA (optional)  
8 ACQ key Acquires a target after selecting it by trackball.  
9 TARGET DATA Displays the acquired target data for 2 or 3 targets at a time.  
10 TARGET CANCEL Terminates plotting of a specified target or all tracked targets.  
12 VECTOR Select vector mode; true or relative.  
13 LOST TARGET Silences the lost target audible alarm and erases the lost target symbol.  
14 CHART ALIGN Aligns chart with the radar display.  
15 MARK Enters/erases mark.  
16 ENTER Used to save settings on menu screen.  
Keys 0-9 Select video plotting symbols. Also used for entering numeric data in any mode as  
applicable.  
-1.4-  
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1.4 CRT Brilliance  
The BRILLIANCE control on the control head of the display unit adjusts the entire screen  
brightness. Note that the optimum point of adjustment varies with ambient light conditions,  
especially between daytime and nighttime.  
Brilliance  
control  
A/C RAIN  
A/C SEA  
GAIN  
BRILLIANCE  
Note: The CRT brilliance should be adjusted before adjusting relative brilliance levels on the  
BRILLIANCE menu to be explained later.  
1.5 Tuning the Receiver  
Tuning method can be selected at RADAR 3 menu; auto or manual.  
1. Press the RADAR MENU key.  
2. Press [0], [0], [2], [0] and [0] in sequence to reach the RADAR 3 menu item.  
3. Press the [9] key twice to change between Auto and Manual.  
4. Press the ENTER key to confirm your selection.  
5. Press the RADAR MENU key to close the menu.  
Automatic tuning  
The radar receiver is tuned automatically each time the power is turned on; thus, there is no  
front panel control for tuning. The tuning indicator and the label AUTO TUNE at the top right  
corner of the display unit show the tuning circuit is working.  
Manual tuning  
If you are not satisfied with the current tune setting, follow these steps to fine-tune the receiver:  
TUNE control  
ERROR lamp (See next page.)  
1. Set the tuning method to manual as described above.  
2. While observing the picture on the 48 mile scale, slowly adjust the TUNE control in the  
tune compartment and find the best tuning point.  
3. Make sure that the radar has been set to the best tuning point. This condition is where the  
tuning indicator lights to about 80% of its total length. Note that the tuning indicator will  
never extend to full length.  
-1.5-  
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Video Freeze-up Recovery  
Video freeze-up or lock-up can occur unexpectedly on any digital rasterscan radars. This is mainly  
caused by heavy spike noise in the power line and can be noticed by carefully watching the nearly  
visible sweep line. If you suspect that the picture is not updated every scan of the antenna or no key  
entry is accepted notwithstanding the apparently normal pictures, do Quick Start to restore normal  
operation.  
1. Turn off the Power Switch and within 10 seconds turn it on again.  
2. Press the Transmit switch labeled STBY/TX for transmit condition.  
NOTE: This equipment has self-diagnostic function to check operational software periodically. If  
any trouble has been found, the ERROR lamp lights. In this case, do the above procedure.  
-1.6-  
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1.6 On-screen Legends and Markers  
Target Alarm Zone (Radar) or Guard Zone (ARPA),  
1st zone between 3 and 6 nm, 2nd zone anywhere.  
Set & Drift values are  
accessible on RADAR MENU.  
Heading line  
Dual-axis SDME  
F: Fore/aft speed (- sign for reverse).  
SB: Port/stbd (-sign for port)  
Cursor position  
from OS  
Heading marker  
Target Data  
SOG*  
HDG 155.0°  
T
AUTO TUNE  
Disp 1  
SPD 12.0KT BT LOG  
12/ 2NM  
ARPA AUTO-MAN  
TRUE VEC 6MIN GRD STAB  
HISTORY 6MIN  
ANT 1 MAIN  
LOG F 10.0 KT  
+ 4.2NM  
320.2° R  
000  
350  
340  
010  
020  
RNG 3.5NM  
SOG SB -1.0 KT  
SET & DRIFT  
HEAD UP RM  
PULSE 1 M1  
BRG 25.5°R  
330  
030  
01  
CSE 264.0°T BT TRU  
SPD 12.3K BT TRU  
CPA 2.9NM  
320  
MAN ALIGNED  
040  
TCPA 94MIN  
BCR 2.9MIN  
310  
300  
290  
050  
060  
070  
EAV 1  
IR3  
ES1  
BCT 94MIN  
RNG 4.7NM  
BRG 78.5°R  
CSE 264.0°T BT TRU  
SPD 12.3K BT TRU  
CPA 2.9NM  
02  
TCPA 94MIN  
BCR 2.9MIN  
BCT 94MIN  
1
0
N
S
20  
280  
270  
260  
080  
090  
40  
60  
80  
100  
W
E
2
-30 20 10  
DEPTH  
21.1m  
CURRENT 1.2KT  
105.7°R  
11.3KT  
285.6  
100  
WPT 2  
150.8NM  
155.0°T  
11.7NM  
162.5°T  
250  
240  
110  
120  
01 +  
OWN SHIP GPS  
34°40.849N  
125°18.115E  
+ CURSOR POSN  
34°39.039N  
X-Band  
A/C AUTO  
NOISE  
230  
130  
135°18.303E  
TRUE TRAIL  
140  
220  
3MIN 1:25  
TGT ALARM 1  
TGT ALARM 2  
12MAR 1998  
REJ  
13:28  
210  
150  
OFFCENTER  
Long-1  
... SIGNAL MISSING ...  
200  
160  
GYRO LOG EPFS TRIGGER  
VIDEO AZIMUTH HEAD LINE  
... ARPA ALARM ...  
190  
170  
180  
EBL  
VRM  
>287.2° R<  
240.0° R  
COLLISION GUARD LOST  
TARGET FULL (AUTO + MAN)  
INDEX LINE  
>140.9  
>10.75NM<  
7.00NM  
WATCH 11:28  
°
<
This cell indicates 3rd target  
data or wind/depth data.  
Function key  
selected  
Stern marker  
North marker  
Manual chart  
alignment  
Orientation of Parallel Index Lines  
*:With the serial speed inputs and SOG selection, if the type of data is changed from SOG to  
STW, the label SOG appears in red at the upper right corner on the screen.  
Note: For W-type (Washington Ferry), ship's heading and speed are indicated as follows.  
AUTO TUNE  
HDG 18.5° GYRO  
SPEED 3.5KT BT NAV  
ANT 1 MAIN  
-1.7-  
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DATA DISPLAY  
HDG 155.0  
T
HDG: Heading T (True = corrected gyro or magnetic heading)  
SPEED 12.0KT BT LOG  
Speed data is LOG, MAN etc. showing sensor and types.  
When set/drift is manually applied, BT appears instead of WT.  
(WT: Water tracking mode, BT: Bottom Tracking mode)  
ARPA AUTO+MAN  
*
TRUE VEC 6MIN GRD STAB  
HISTORY 6MIN  
RNG 4.7NM  
01 BRG 25.5 T  
CSE 264.0 T BT TRU  
SPD 12.3KT BT TRU  
CPA 3.4NM  
SEA STAB: Sea stabilization, displayed objects subject to water,  
current.  
GND STAB: Ground stabilization, compensated for the current;  
stationary objects appear stationary on the display.  
Target NO. 01 - 40 in ARPA, 01 - 10 in EPA, automatically assigned.  
The numbers are left occupied if targets are lost or intentionally  
removed until the full numbers are used up.  
TCPA 94MIN  
BCR 2.9NM  
BCT 94NM  
RNG 2.0NM  
02 BRG 180.0 T  
CSE 200.0 T BT TRU  
SPD 10.5KT BT TRU  
CPA 1.3NM  
Interpreting Course Ex. 180.0 T BT TRU  
T: True, referenced to True North  
BT: Bottom tracking (referenced on the bottom)  
TRU: Vector orientation  
TCPA 15.1MIN  
BCR 3.0NM  
BCT 25NM  
1:23  
Numerals on division lines Ex. 1:23: Elapsed time since last plot (EPA  
only)  
RNG 2.0NM  
03 BRG 180.0 T  
CSE 200.0 T BT TRU  
SPD 10.5KT BT TRU  
CPA 1.3NM  
This third target data area may be used to indicate the graphics of wind  
and depth data if the third target data is not interested.  
TCPA 15.1MIN  
BCR 3.0NM  
BCT 25NM  
DEPTH  
CURRENT  
WIND  
21.1m  
2.2KT  
105.7 T  
11.3KT  
285.6 T  
This display cell shows digital readouts of water depth, ocean currents,  
wind if associated sensors are in use.  
WPT 2  
01  
150.8NM  
155.0 T  
Bearing and range to waypoint  
11.7NM  
162.5 T  
Bearing and range from origin mark to cursor.  
OWN SHIP [GP]  
34 40.849N  
125 18.115E  
+CURSOR POSN  
34 39.039N  
Electronic Position-Fixing System, such as GPS, DGPS, DECCA,  
LORAN C. Status (Healthy or invalid) will be indicated.  
135 18.303E  
12 MAR 1998 13:28 LOCAL  
Date and time.  
... SIGNAL MISSING ...  
GYRO LOG EPFS TRIGGER Warning and indications  
VIDEO AZIMUTH HEAD LINE  
.... ARPA ALARM ....  
COLLISION GUARD LOST  
TARGET FULL (AUTO + MAN)  
*Note: When a presentation mode other than north-up true motion is  
selected in true vector mode, TRUE VEC indication appears in  
red to alert you.  
-1.8-  
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1.7 Degaussing the CRT Screen  
Each time the radar is turned on, the degaussing circuit automatically demagnetizes the CRT  
screen to eliminate color contamination caused by earth's magnetism or magnetized ship  
structure.  
The screen is also degaussed automatically at certain time intervals. While being degaussed,  
the screen may be disturbed momentarily with vertical lines. If you wish to degauss by manual  
operation, open the tuning compartment and press the Degauss switch.  
POWER switch  
POWER  
BRILLIANCE  
A/C RAIN  
A/C SEA  
GAIN  
ON  
PM  
ANTENNA  
Tuning compartment  
#1  
#3  
#2  
STBY  
TX  
OFF  
ON  
TUNE  
EBL  
RANGE  
#4  
DEGAUSS ERR  
DEGAUSS SWITCH  
1.8 Initializing the Gyro Readout  
With a gyrocompass interfaced with the radar, ship's heading is displayed at the top of the  
screen. Upon turning on the radar, align the on-screen GYRO readout with the gyrocompass  
reading by the procedure shown below. Once you have set the initial heading correctly,  
resetting is not usually required. However, if the GYRO readout goes wrong for some reason,  
repeat the procedure to correct it.  
1. Press the RADAR MENU key to display the FUNCTIONS 1 menu.  
2. Press the [0] key twice to display the FUNCTIONS 3 menu.  
3. Press the [9] key to select GYRO SETTING option.  
4. Rotate the EBL control to adjust the gyrocompass reading.  
5. Press the ENTER key to confirm the setting.  
-1.9-  
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1.9 Presentation Modes  
This radar has the following presentation modes:  
Relative Motion (RM)  
Head-up:  
Unstabilised  
Head-up TB: Head-up with compass-stabilized bearing scale (True Bearing) where the  
bearing scale rotates with the compass reading.  
Course-up: Compass-stabilized relative to ship's intended course  
North-up:  
Compass-stabilized with reference to north  
True Motion (TM)  
North-up:  
Ground or sea stabilized with compass and speed inputs  
Selecting presentation mode  
Press the MODE key on the control head. Each time the MODE key is pressed, the  
presentation mode and mode indication at the upper-left corner of the screen change  
cyclically.  
MODE key  
HL  
PANEL  
BRILL  
MODE  
3
AUDIO  
OFF  
RADAR  
MENU  
PLOT  
MENU  
NAV  
MENU  
OFF  
2
1
OFF  
LOST  
VECTOR  
5
CENTER  
TARGET  
4
6
ACQ  
CHART  
ALIGN  
EBL  
7
MARK  
9
TARGET  
DATA  
8
TARGET  
TRAILS  
CU, TM  
RESET  
A/C  
AUTO  
TARGET  
CANCEL  
CANCEL  
0
ENTER  
Loss of Gyrocompass signal  
When the compass signal is lost, the presentation mode automatically becomes head-up and the  
HDG (heading) readout at the top of the text area shows asterisks ***. Also GYRO appears in  
red characters at the lower right corner on the screen. When the gyrocompass signal is restored,  
the SET HDG appears at the upper-right corner on the screen. Press the MODE key, and the  
asterisks and GYRO go off. Align the HDG readout with the gyrocompass reading, referring to  
the previous section 1.8. Finally press the CANCEL key to erase the message SET HDG.  
-1.10-  
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Presentation mode,  
Description  
representative display  
Heading Marker  
Heading Line  
Head-up mode  
000  
350  
010  
020  
340  
North marker330  
030  
A display without azimuth stabilization in which the line  
connecting the center with the top of the display indicates  
own ship’s heading.  
320  
040  
310  
050  
060  
070  
080  
300  
290  
The target pips are painted at their measured distances  
and in their directions relative to own ship’s heading.  
280  
090  
100  
270  
260  
250  
240  
A shore line on the bearing scale is the north marker  
indicating compass north. A failure of the compass input  
will cause the north marker to disappear and the readout  
to show asterisks (***.*) and the message GYRO appears  
in red at the lower-right corner of the screen.  
110  
120  
130  
230  
220  
140  
210  
200  
150  
160  
190  
180  
170  
Heading Marker  
Heading Line  
010  
020  
Course-up mode  
North marker  
000  
350  
340  
330  
030  
An azimuth stabilized display in which a line connecting  
the center with the top of the display indicates own ship’s  
intended course (namely, own ship’s previous heading just  
before this mode has been selected).  
320  
040  
310  
300  
290  
280  
050  
060  
070  
080  
Target pips are painted at their measured distances and in  
their directions relative to the intended course which is  
maintained at the 0-degree position while the heading line  
moves in accordance with ship’s yawing and course  
change. This mode is useful to avoid smearing of picture  
during course change. After a course change, press the  
[CU, TM RESET] key to reset the picture orientation if you  
wish to continue using the course-up mode. The heading  
line gets back to scale zero.  
090  
100  
270  
260  
250  
240  
110  
120  
130  
230  
140  
220  
210  
150  
200  
160  
190  
170  
180  
earing scale rotates with a compass signal  
Heading Marker  
Head-up TB (True Bearing) mode  
Radar echoes are shown in the same way as in the  
head-up mode. The difference from normal head-up  
presentation lies in the orientation of the bearing scale.  
The bearing scale is compass stabilized. That is, it rotates  
in accordance with the compass signal, enabling you to  
know own ship’s heading at a glance.  
340  
330  
350  
000  
320  
North marker  
310  
010  
300  
020  
290  
280  
270  
260  
030  
040  
050  
060  
070  
080  
250  
240  
This mode is available only when the radar is interfaced  
with a gyrocompass.  
230  
220  
090  
100  
110  
If the compass fails, the bearing scale returns to the state  
of head-up mode.  
210  
120  
200  
190  
130  
180  
140  
170  
150  
160  
-1.11-  
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Presentation mode,  
Description  
representative display  
North  
North-up mode  
Heading Line  
000  
350  
010  
020  
340  
330  
030  
In the north-up mode, target pips are painted at their  
measured distances and in their true (compass) directions  
from own ship, north bearing maintained up of the screen.  
The heading line changes its direction according to the  
ship’s heading.  
320  
040  
Heading  
Marker  
310  
300  
290  
280  
050  
060  
070  
080  
090  
100  
270  
260  
If the gyrocompass fails, the presentation mode changes  
to head-up and the north marker disappears. Also, the  
HDG readout shows asterisks (***.*) And the message  
GYRO appears in red at the lower-right corner of the  
screen.  
250  
240  
110  
120  
130  
230  
140  
220  
210  
150  
200  
160  
190  
170  
180  
True motion mode  
North  
Own ship and other moving objects move in accordance  
with their true courses and speed. In ground stabilized  
TM, all fixed targets, such as landmasses, appear as  
stationary echoes. In the sea stabilized TM without set  
and drift inputs, the landmass can move on the screen.  
Heading Line  
000  
350  
010  
020  
340  
330  
030  
320  
040  
Heading  
Marker  
310  
300  
290  
050  
060  
070  
080  
When own ship reaches a point corresponding to 75% of  
the radius of the display, it is automatically reset to a point  
of 75% radius opposite to the extension of the heading  
marker passing through the display center. Resetting can  
be made at any moment before the ship reaches the limit  
by pressing the [CU, TM reset]. Automatic resetting is  
preceded by a beep sound.  
280  
270  
260  
090  
100  
250  
240  
110  
120  
130  
230  
140  
220  
210  
150  
200  
160  
190  
170  
180  
If the compass fails, the mode is changed to the head-up  
and the north marker disappears. The HDG readout  
shows asterisks (***.*) and the message GYRO appears  
in red at the lower-right corner of the screen.  
350 000 010  
350 000 010  
350 000 010  
340  
340  
020  
340  
020  
020  
Target trail  
040  
330  
030  
330  
030  
330  
030  
320  
320  
320  
040  
040  
310  
300  
290  
050  
060  
070  
080  
310  
300  
290  
280  
050  
060  
070  
080  
310  
300  
290  
280  
050  
060  
070  
080  
280  
270  
090  
100  
270  
260  
090  
100  
270  
260  
090  
100  
260  
250  
240  
250  
240  
230  
250  
240  
230  
110  
120  
130  
110  
120  
110  
120  
130  
230  
130  
140  
220  
140  
220  
220  
140  
210  
210  
210  
150  
150  
150  
200  
160  
200  
160  
200  
160  
190 180 170  
190 180 170  
190 180 170  
(a) True motion Is selected  
(b) Own ship has reached a (c) own ship is automatically  
point 75% of display radius reset to 75% of radius  
-1.12-  
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1.10 Selecting the Range Scale  
The display range scale is changed by pressing the [+] and [-] keys. The selected range scale  
and range ring interval are shown at the upper left corner on the screen. When a target of  
interest comes closer, reduce the range scale so that it appears in 50 - 90 % of the display  
radius. The range scales are:  
0.1250.250.50.751.53−6−12−24−48−96 nm (IMO-type)  
(Maximum range for Regular type or Japanese version is 72 nm for FR-2115/2115-B or 120  
nm for other models)  
1.11 Selecting the Pulselength  
The pulselength in use is displayed at the upper-left position of the screen using the  
abbreviations shown in the table below.  
Appropriate pulselengths are preset to individual range scales and function keys. Therefore,  
you are not usually required to select them. If you are not satisfied with the current pulselength  
settings, however, it is possible to change them by the Radar menu operation shown below.  
You can choose the pulselength 1 or 2 on the scales 0.5 to 24 nm ranges on FR-2115/2125  
models (0.75 to 24 nm ranges on the other models).  
Selecting pulselength 1 or 2  
1. Press the RADAR MENU key to display the FUNCTIONS 1 menu.  
2. Press the [6] key to select PULSELENGTH 1 or 2 as appropriate.  
3. Press the RADAR MENU key to close the FUNCTIONS menu.  
LABEL  
P/L in FR-2115/2125/  
2115-B/2125-B  
P/L in other models  
S (Short pulse)  
-
0.08 µs  
S1 (Short pulse 1)  
S2 (Short pulse 2)  
M1 (Medium pulse 1)  
M2 (Medium pulse 2)  
M3 (Medium pulse 3)  
L (Long pulse)  
0.07 µs  
0.15 µs  
0.3 µs  
0.5 µs  
0.7 µs  
1.2 µs  
-
-
0.3 µs (0.2 µs in FR-2155, 2165DS)  
0.6 µs  
-
1.2 µs  
-1.13-  
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Presetting pulselengths 1 and 2  
Pulselength 1 and 2 can be preset on the PULSE WD 1 and 2 menus. Shown below are  
examples of the pulselength setup procedure:  
1. To enable selection of S1 (0.07 µs) and S2 (0.15 µs) pulselength on the 0.5 nm range on  
FR-2115/2125/2115-B/2125-B model, select S1 at 0.5 nm on the PULSE WD 1 menu and  
S2 at 0.5 nm on the PULSELENGTH 2 menu.  
2. To enable selection of S2 (0.15 µs) and M1 (0.3 µs) pulselength on the 3 nm range on  
FR-2115/2125/2115-B/2125-B model, select S2 at 3 nm in the PULSE WD 1 menu and  
M1 at 3 nm in the PULSE WD 2 menu.  
A longer pulse provides an increased detection range, but with reduced discrimination. If you  
need discrimination in preference to detection, choose a shorter pulse.  
Example: To select S1 (0.07 µs) as Pulselength 1 for the 0.5 nm range, display the  
PULSELENGTH 1 menu following the steps shown above and hit the [2] key to choose "0.5  
NM." Further hit the [2] key until the menu option "S1" is highlighted to the right of "0.5  
NM."  
-1.14-  
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[RADAR MENU] key  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM*  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
[0] key  
[1] key  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/ COLOR*  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
7 SET, DRIFT  
OFF/MAN  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
*: R-type only  
*1: Fishing mode only (one type of R-type)  
[0] key  
[1] key  
[FUNCTIONS 3]  
[RADAR 1]  
1 [FUNCTIONS 2]  
2 [RADAR 1]  
1 [FUNCTIONS 3]  
2 EBL 1 *  
3 EBL 2 *  
4 VRM 1 *1  
5 VRM 2 *1  
REL/TRUE  
REL/TRUE  
NM/km (IMO: nm only)  
NM/km (IMO: nm only)  
REL/TRUE  
3 [FUNCTION KEY 1]  
4 [FUNCTION KEY 2]  
5 [FUNCTION KEY 3]  
6 [FUNCTION KEY 4]  
7 RADAR*  
7 INTER SWITCH  
8
9 GYRO SETTING EBL = xxx.x°  
0 [FUNCTIONS 4]  
6 TRAIL  
1/2  
[2] 7 TRAIL GRAD  
8 [PULSE WD 1]  
9 [PULSE WD 2]  
0 [RADAR 2]  
SGL/MULT  
In RADAR 1 menu, select 8 for pulselength 1 or 9 for pulselength 2. Selection available is as  
below for FR-2115/2125/2115-B/2125-B:  
0.5 nm range  
1.5 nm range  
6 nm range  
S1/S2  
0.75 nm range S1/S2/M1  
3 nm range S2/M1/M2/M3  
S1/S2/M1  
M1/M2/M3/L 12-24 nm range M2/M3/L  
-1.15-  
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1.12 Adjusting the Sensitivity  
The GAIN control is used to adjust the sensitivity of the receiver, and thus the intensity of  
echoes as they appear on the screen. It should be adjusted so that speckled background noise  
is just visible on the screen.  
To become acquainted with the way the GAIN control works, try rotating it between fully  
counterclockwise and clockwise positions while observing the radar picture. You will notice  
that clockwise rotation increases the echo intensity level. A low gain setting results in the loss  
of weak echoes and a reduced detection range. If you turn the GAIN control too far clockwise  
for an excessive gain setting, desired echoes will be masked in the strong background noise.  
GAIN CONTROL  
POWER  
BRILLIANCE  
A/C RAIN  
A/C SEA  
GAIN  
ON  
PM  
ANTENNA  
#1  
#3  
#2  
STBY  
TX  
OFF  
ON  
TUNE  
EBL  
RANGE  
#4  
DEGAUSS ERR  
1.13 Suppressing Sea Clutter  
In rough weather conditions returns from the sea surface are received over several miles  
around own ship and mask close targets. This situation can be improved by properly adjusting  
the A/C SEA (Anti-Clutter Sea) control.  
A/C SEA CONTROL  
BRILLIANCE  
A/C RAIN  
A/C SEA  
GAIN  
#1  
#3  
#2  
STBY  
TX  
OFF  
ON  
EBL  
RANGE  
#4  
A/C SEA control  
off  
A/C SEA control  
adjusted  
-1.16-  
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Automatic anti-clutter control  
The easiest way to suppress the surface clutter  
is to use the automatic control. Press the A/C  
AUTO key. Use of a function key is also a  
good method for reducing sea clutter. For this  
purpose, presetting is required. Consult a  
FURUNO representative.  
HL  
PANEL  
BRILL  
MODE  
3
AUDIO  
OFF  
RADAR  
MENU  
PLOT  
MENU  
NAV  
MENU  
OFF  
2
1
OFF  
CENTER  
LOST  
TARGET  
VECTOR  
5
4
6
AC  
CHART  
ALIGN  
EBL  
7
MARK  
9
TARGET  
DATA  
8
TARGET  
TRAILS  
CU, TM  
RESET  
A/C  
AUTO  
TARGET  
CANCEL  
CANCEL  
0
ENTER  
A/C AUTO key  
CAUTION  
The auto A/C function can erase weak target echoes.  
Manual anti-clutter control  
From the fully counterclockwise position, slowly turn the A/C SEA control clockwise. For  
optimum target detection, you should leave speckles of the surface return slightly visible.  
The anti-clutter sea control is often referred to as STC (Sensitivity Time Control) which  
decreases the amplification of the receiver immediately after a radar pulse is transmitted, and  
progressively increases the sensitivity as the range increases.  
A common mistake is to over-adjust the A/C SEA control so that the surface clutter is  
completely removed. By rotating the control fully clockwise, you will see how dangerous this  
can be; a dark zone is created near the center of the screen and close-in targets can be lost.  
This dark zone is even more dangerous if the gain has not been properly adjusted. Always  
leave a little surface clutter visible on the screen. If no surface clutter is observed (on a very  
calm water), set the control at the fully counterclockwise position.  
-1.17-  
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1.14 Suppressing Precipitation Clutter  
In adverse weather conditions, clouds, rain or snow produce a lot of spray-like spurious  
echoes and impairs target detection over a long distance. This situation can be improved by  
using a function key provided that it is so programmed. If the function key fails to offer a  
favorable suppression of the rain clutter, adjust the A/C RAIN control on the front control  
head.  
A/C RAIN CONTROL  
BRILLIANCE  
A/C RAIN  
A/C SEA  
GAIN  
1
3
2
STBY  
TX  
OFF  
ON  
EBL  
RANGE  
4
A/C RAIN control  
OFF  
A/C RAIN control  
adjusted  
The A/C RAIN control adjusts the receiver sensitivity as the A/C SEA control does but rather  
in a longer time period (longer range). Clockwise rotation of this control increases the anti-  
clutter effect.  
1.15 Interference Rejector  
Mutual radar interference may occur in the vicinity of another  
shipborne radar operating in the same frequency band (9 GHz for  
X-band, 3 GHz for S-band). It is seen on the screen as a number of  
bright spikes either in irregular patterns or in the form of usually  
curved spoke-like dotted lines extending from the center to the edge  
of the picture. This type of interference can be reduced by activating  
the interference rejector circuit.  
The interference rejector is a kind of signal correlation circuit. It  
compares the received signals over successive transmissions and  
suppresses randomly occurring signals. There are three levels of  
interference rejection depending on the number of transmissions that  
are correlated. These are indicated by the legends IR1, IR2 and IR3  
at the upper-left position of the screen.  
Radar interference  
-1.18-  
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To activate the interference rejector;  
1. Press the RADAR MENU key. The following appears.  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
2. Press the [7] key to select the INT REJECT option.  
3. Successive presses of the key increase the effect of interference rejection, up to level 3. A  
fourth press deactivates the interference rejector. Switch off the interference rejector when  
no interference exists; otherwise weak targets may be lost.  
Note: For stable reception of certain types of radar beacons (Racons) or SART (Search and  
Rescue Radar Transponder) as required by SOLAS 1974 as amended 1988 (GMDSS), it is  
recommended to turn the interference rejector off.  
1.16 Measuring the Range  
Use the fixed range rings to obtain a rough estimate of the range to a target. They are  
concentric solid circles about own ship, or the sweep origin. The number of rings is  
automatically determined by the selected range scale and their interval is displayed at the  
upper-left position of the screen.  
Procedure  
1. Press the RADAR MENU key to display FUNCTIONS 1 menu.  
2. Press the [0] key to display FUNCTIONS 2 menu.  
3. Press [9] key to display BRILLIANCE 1 menu.  
[BRILLIANCE 1]  
1 [FUNCTIONS 2]  
2 RINGS BRILL  
3 EBL BRILL  
4 VRM BRILL  
OFF/DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
5 +CURSOR BRILL OFF/DIM/M1/M2/BRT  
6 CHAR BRILL  
7 MARK BRILL  
8 TRAIL BRILL  
9 HL BRILL  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M/BRT  
0 [BRILLIANCE 2]  
-1.19-  
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4. Press [2] key to select RINGS BRILL option.  
5. Press [2] key again. Each pressing gradually increase their brightness in 4 steps and fifth  
press erases the range rings.  
6. Press the ENTER key to confirm you selection.  
7. Press the RADAR MENU key to close the menu.  
Use the Variable Range Markers (VRMs) for more accurate measurement of the range to a  
target. There are two VRMs, No. 1 and No. 2, which appear as dashed rings so that you can  
discriminate them from the fixed range rings. The two VRMs can be distinguished from each  
other by different lengths of dashes.  
000  
350  
010  
020  
340  
330  
030  
No.1  
VRM  
Target  
blip  
320  
040  
310  
300  
290  
280  
050  
060  
070  
080  
090  
270  
260  
100  
No.2  
VRM  
250  
240  
110  
120  
130  
230  
140  
220  
210  
150  
VRM  
0.66NM  
1.18NM  
200  
160  
190  
170  
180  
Active VRM is identified  
with this marker.  
Measuring the range  
Press the VRM ON key to display either of the VRMs.  
Successive presses of the VRM ON key toggle the active VRM between No. 1 and No. 2 and  
the currently active VRM readout is circumscribed by >.....<.  
Turning the VRM control, align the active variable range marker with the inner edge of the  
target of interest and read its distance at the lower-right corner of the screen. Each VRM  
remains at the same geographical distance when you operate the RANGE+ or RANGE- key.  
This means that the apparent radius of the VRM ring changes in proportion to the selected  
range scale.  
Press the VRM OFF key to key to erase each VRM.  
-1.20-  
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1.17 Measuring the Bearing  
Use the Electronic Bearing Lines (EBLs) to take bearings of a target. There are two EBLs, No.  
1 and No. 2, which are toggled by successive presses of the EBL ON key. Each EBL is a  
straight dashed line extending out from the own ship position up to the circumference of the  
radar picture. The fine dashed line is the No. 1 EBL and the coarse dashed one is the No. 2  
EBL.  
Press the EBL ON key to display either of the EBLs.  
Successive presses of the EBL ON key toggle the active EBL between No. 1 and No. 2 and  
the currently active EBL readout is circumscribed by >... <.  
Rotate the EBL rotary control clockwise or counterclockwise until the active EBL bisects the  
target of interest, and read its bearing at the lower-left corner of the screen.  
The EBL readout is affixed by "R" (relative) if it is relative to own ship's heading, "T" (true) if  
it is referenced to the north, as determined by RADAR 2 menu settings.  
Each EBL carries a range marker, or a short line crossing the EBL at right angles and its  
distance from the EBL origin is indicated at the VRM readout whether or not the  
corresponding VRM is displayed. The range marker changes its position along the EBL with  
the rotation of the VRM control.  
Press the EBL OFF key to erase each EBL.  
No.2  
000  
350  
010  
020  
340  
EBL  
Target  
blip  
330  
030  
320  
040  
310  
300  
290  
280  
050  
060  
070  
080  
090  
100  
270  
260  
No.1  
EBL  
Range scale  
markers on EBLs  
250  
240  
110  
120  
130  
230  
220  
140  
VRM  
0.97NM  
1.11NM  
EBL  
210  
150  
200  
160  
32.5°T  
190  
170  
180  
298.0°T  
Active EBL is indicated  
with this marker.  
-1.21-  
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1.18 Collision Assessment by Offset EBL  
The origin of the EBL can be placed anywhere with the trackball to enable measurement of  
range and bearing between any targets. This function is also useful for assessment of the  
potential risk of collision. To assess possibility of collision:  
1. Press the EBL ON key to display or activate an EBL (No. 1 or 2).  
2. Place the cursor (+) on a target appearing as threatening (A in the illustrated example) by  
operating the trackball.  
3. Press the EBL OFFSET key on the mode panel, and the origin of the active EBL shifts to  
the cursor position. Press the EBL OFFSET key again to anchor the EBL origin.  
4. After waiting for a few minutes (at least 3 minutes), operate the EBL control until the EBL  
bisects the target at the new position (A'). The EBL readout shows the target ship's course,  
which may be true or relative depending on the settings on the RADAR 1 menu.  
If relative motion is selected, it is also possible to read CPA (Closest Point of Approach) by  
using a VRM as shown below (Figure (a)). If the EBL passes through the sweep origin  
(own ship) as illustrated (Figure (b)), the target ship is on a collision course.  
5. To return the EBL origin to the own ship's position, press the EBL OFFSET key again.  
000  
010  
020  
000  
350  
350  
010  
020  
340  
VRM 1  
030  
340  
330  
030  
330  
320  
320  
040  
040  
050  
310  
300  
290  
280  
050  
060  
070  
080  
310  
300  
290  
280  
060  
A
A
070  
080  
A1  
A1  
090  
100  
270  
260  
090  
100  
270  
260  
250  
240  
250  
240  
110  
120  
130  
110  
120  
130  
230  
230  
EBL 1  
EBL  
> 150.3°R<  
140  
220  
EBL 1  
EBL  
> 150.3°R<  
140  
220  
210  
150  
210  
150  
VRM  
>3.85 NM<  
200  
VRM  
> 0.00 NM<  
160  
200  
160  
190  
170  
180  
190  
170  
180  
(a) Evaluating the target ship course in RM  
(b) Target ship on collision course  
-1.22-  
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1.19 Measuring Range and Bearing Between Two Targets  
Press the EBL OFFSET key, and place the origin of No. 1 EBL, for example, on a target of  
interest (target 1 in the illustrated example) by operating the trackball.  
Turn the EBL control until the EBL passes through another target of interest (target 2).  
Turn the VRM control until the range marker aligns with target 2. The active VRM readout at  
the lower-right corner of the screen indicates the distance between the two targets.  
You can repeat the same procedure on third and forth targets (targets 3 and 4) by using No. 2  
EBL and No. 2 VRM.  
Bearing is shown relative to own ship with suffix "R" or as a true bearing with suffix "T"  
depending on EBL relative/true settings on the RADAR 1 menu. To return the EBL origin to  
the own ship position, press the EBL OFFSET key again.  
No.2  
EBL  
Range  
marker  
000  
350  
010  
020  
340  
330  
030  
320  
040  
310  
300  
050  
060  
070  
080  
Range  
marker  
Target 2  
Target 4  
No.1  
EBL  
290  
R2  
Target 1  
280  
R2  
090  
100  
270  
R1  
Target 3  
EBL  
origin  
260  
250  
240  
No.1 VRM  
No.2 VRM  
110  
120  
130  
230  
220  
140  
210  
150  
VRM  
> 0.50NM<  
0.98NM  
EBL  
200  
160  
190  
170  
180  
> 140.0°R<  
335.2°R  
Range/bearing  
between targets  
1 and 2  
Range/bearing  
between targets  
3 and 4  
1.20 Setting a Target Alarm Zone  
CAUTION  
The target alarm feature should never be relied upon as the sole means for detecting the  
risk of potential collision. The operator of a ship is not relieved of the responsibility to keep  
lookout for avoiding collisions, whether or not the radar is in use.  
The target alarm serves to alert the navigator to targets (ships, landmasses, etc.) entering a  
certain area with visual and audible alarms.  
-1.23-  
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The zone has a fixed width of 0.5 nm in the radial direction (depth) and is adjustable only  
within 3.0 to 6.0 nm from own ship. On the R-type, the outer and inner boundaries can be set  
at any distance. On any radar type, the sector of the zone can be set anywhere between 0 and  
360 degrees in any direction.  
To set a target alarm zone:  
1. Place the cursor (+) at point "A" (see figure below) using the trackball.  
2. Press the RADAR MENU key to show the FUNCTION 1 menu.  
3. Press [2] key to set start point (point "A") of the alarm zone. The message TGT ALARM 1  
(or 2) SET appears at the bottom-right corner of the screen.  
4. Move the cursor (+) to point "B" and press the [2] key again. Then, the target alarm zone as  
illustrated is created and the label TGT ALARM 1 (or 2) appears instead of TGT ALARM  
1 (or 2) SET at the lower-right corner of the screen.  
Note: If you wish to create a target alarm zone having a 360-degree coverage around own  
ship, set point "B" in almost the same direction (approx. ±3°) as point "A" and press the [2]  
key.  
If you change the range scale to less than half of the TAZ, the warning TGT ALARM 1 (or  
2) OUT appears instead of TGT ALARM 1 (or 2).  
5. Two alarm zones can be set as described above. Press [ENTER] and [2] keys in that order  
while displaying the FUNCTION 1 menu and repeat the above steps.  
TAZ  
000  
350  
010  
020  
340  
330  
030  
320  
040  
310  
300  
290  
280  
050  
060  
070  
080  
Target alarm zone (TAZ) can be set in any sector  
between 3 and 6 nm on IMO-type, or anywhere on  
the R-type.  
A
B
090  
100  
270  
260  
When the radar has an ARPA board ARP-26, a total  
of 4 alarm zones (2 each TAZ and GZ) may be set.  
250  
240  
110  
120  
130  
230  
The 2nd TAZ or 2nd GZ is available only when the  
1st TAZ or 1st GZ is valid.  
140  
220  
210  
150  
200  
160  
190  
170  
180  
Acknowledging alarm  
A target entering the watch zone produces both visual (flashing) and audible (beeping) alarms.  
To silence the audible alarm, press [2] key shortly on the FUNCTION 1 menu and the label  
TGT ALARM 1 ACK replaces TGT ALARM 1 on the display.  
This will deactivate the audible alarm but will not stop the flashing of the target in the guard  
alarm zone. To reactivate the audible alarm, press [2] key again on the FUNCTIONS 1 menu.  
When an external buzzer is connected, the audible alarm does not stop until deactivation of the  
guard alarm.  
-1.24-  
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Deactivating guard alarm  
Hold the [2] key depressed for at least 5 seconds on the FUNCTION 1 menu. In the IMO type,  
deactivation of TAZ 1 deactivates TAZ 2. TAZ 1 and 2 work independent in the Regular type.  
Note: The echo watch alarm is given to targets having a certain level of echo strength. This  
level does not always imply a landmass, reef, ships or other surface objects but can mean  
returns from the sea surface or precipitation. Properly adjust the GAIN, A/C SEA, and A/C  
RAIN controls to reduce noise to avoid generation of an alarm against false target.  
Inward and outward guard alarms  
On the R-type, an inward or outward guard alarm can be selected on the RADAR 2 menu. On  
the IMO type, only the inward guard alarm is available. The inward guard alarm generates  
visual and audible warnings when a target enters the guard zone from any direction. The  
outward guard alarm is produced when a target leaves the guard zone (This is not a guard  
zone by definition but some users find this feature valuable).  
(a) Inward guard  
alarm available on  
IMO and R-types  
(b) Outward guard  
alarm available on  
R-type only  
1.21 Off-Centering  
Own ship position, or sweep origin, can be displaced to expand the view field without  
switching to a larger range scale. The sweep origin can be off-centered to the cursor position,  
but not more than 75% of the range in use; if the cursor is set beyond 75% of the range scale,  
the sweep origin will be off-centered to the point of 75% of the limit.  
This feature is not available on the longest range scale. The number of range rings increases  
keeping the original range intervals unchanged.  
To off-center the radar picture:  
1. Place the cursor at a position where you wish to move the sweep origin by operating the  
trackball.  
2. Press the OFF CENTER key. Then, the sweep origin is off-centered to the cursor position.  
3. To cancel off-centering, press the OFF CENTER key again.  
The picture cannot be off-centered in the true motion mode.  
-1.25-  
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1.22 Echo Stretch  
On long ranges target echoes tend to shrink in the bearing direction, making them difficult to  
see. On short and medium ranges such as 1.5, 3 and 6 nm scales, the same size targets get  
smaller on screen as they approach the own ship. These are due to the inherent property of the  
radiation pattern of the antenna. To enhance target video, use the echo stretch function. There  
are 3 settings: echo stretch 1 (ES1) to enlarge in bearing direction for long range detection,  
echo stretch 2 (ES2) to enlarge in range direction and echo stretch 3 (ES3) to enlarge in  
bearing and range directions.  
To activate the echo stretch:  
1. Press the RADAR MENU key to show the FUNCTIONS 1 menu.  
2. Press the [0] key to display the FUNCTIONS 2 menu.  
3. Press the [3] key to select ECHO STRETCH.  
4. Press [3] until Echo Stretch option 1, 2, 3 or OFF as desired is highlighted.  
5. Press the ENTER key to conclude your selection followed by the RADAR MENU key to  
close the FUNCTIONS menu. Selected setting is marked on the left side of the radar  
display.  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
LOG//NAV*/MAN  
MAN = xx.xKT (STW/SOG)  
OFF/MAN  
7 SET, DRIFT  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
*: R-type only  
-1.26-  
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ES OFF  
ES1 - Enlarged in  
bearing direction  
ES2 - Enlarged in ES3 - Enlarged in both  
range direction.  
Invalid at P/L S1 and  
S2  
bearing and range  
directions  
Use on range 1.5-12  
nm  
To enlarge more than ES 2  
Use on range 1.5-6 nm  
Notes:  
1) If the 1.5 nm range is preset with a pulselength of S1 or S2, and the 3 nm scale with S2,  
the echo stretch is not available on these range scales.  
2) The echo stretch magnifies not only small target pips but also returns (clutter) from sea  
surface, rain and radar interference. For this reason make sure these types of interference  
have been sufficiently suppressed before activating this function.  
1.23 Echo Averaging  
The echo average feature effectively suppresses sea clutter. Echoes received from stable  
targets such as ships appear on the screen at almost the same position every rotation of the  
antenna. On the other hand, unstable echoes such as sea clutter appear at random positions.  
To distinguish real target echoes from sea clutter, this radar performs scan-to-scan correlation.  
Correlation is made by storing and averaging echo signals over successive picture frames. If  
an echo is solid and stable, it is presented in its normal intensity. Sea clutter is averaged over  
successive scans resulting in the reduced brilliance, making it easier to discriminate real  
targets from sea clutter.  
To properly use the echo average function, it is recommended to first suppress sea clutter with  
the A/C SEA control and then do the following:  
-1.27-  
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1. Press the RADAR MENU key and the [0] key to show the FUNCTIONS 2 menu.  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
LOG/NAV*/MAN  
MAN = xx.xKT (STW/SOG)  
OFF/MAN  
7 SET, DRIFT  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
*: R-type only  
2. Press the [4] key to select ECHO AVERAGE.  
3. Press [4] until echo average option 1, 2, 3 or OFF as desired is highlighted.  
OFF: No averaging effect  
1:  
Helps distinguish targets from sea clutter and suppresses brilliance of unstable  
echoes  
2:  
3:  
Distinguishes small stationary targets such as navigation buoys.  
Stably displays distant targets.  
4. Press the ENTER key to conclude your selection followed by the RADAR MENU key to  
close the FUNCTIONS menu.  
(a) Echo average OFF (b) Echo average ON  
Echo averaging uses scan-to-scan signal correlation technique based on the true motion over  
the ground of each target. Thus, small stationary targets such as buoys will be shown while  
suppressing random echoes such as sea clutter. True echo average is not however effective for  
picking up small targets running at high speeds over the ground.  
Echo average is inoperable when a gyrocompass signal is not available. If you wish to use this  
feature without a gyrocompass signal, consult a FURUNO representative.  
-1.28-  
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Manual speed entry is done at menu item 6 SHIP'S SPEED on the FUNCTIONS 2 menu  
which is accessed by pressing the RADAR MENU key.  
CAUTION  
Do not use the Echo Average function  
under heavy pitching and rolling loss of  
target detection can result.  
1.24 Electronic Plotting Aid (EPA)  
A maximum 10 operator-selected targets can be plotted electronically to assess their motion  
trend. Five past positions can be displayed for each of the plotted targets. If you enter a 6th  
plot on a certain target, the oldest plot (past position) will be erased.  
A vector appears when you enter a second plot for the target and is updated each time a new  
plot is entered. The vector shows the target motion trend based on its latest two plots. The  
vector origin will move across the screen at a rate and direction defined by the calculated true  
course and speed until a next manual plotting.  
Target data is shown in the data display area which shows:  
bearing, course, speed, CPA, TCPA, calculated true course of targets, calculated true speed of  
targets  
EPA time  
Target Data  
HDG 155.0°  
T
AUTO TUNE  
Disp 1  
SPD 12.0KT BT LOG  
12/ 2NM  
EPA  
ANT 1 MAIN  
LOG F 10.0 KT  
SB -1.0 KT  
9.5  
+ 4.2NM  
REL VECTOR 6MIN 3:20  
000  
320.2° R  
350  
010  
3:20  
1:25  
020  
340  
RNG 3.5NM  
HEAD UP RM  
PULSE 1 M1  
BRG 25.5°R  
330  
030  
01  
CSE 264.0°T BT TRU  
SPD 12.3K BT TRU  
CPA 2.9NM  
320  
040  
050  
TCPA 6MIN  
BCR 2.9MIN  
310  
300  
290  
EAV 1  
IR3  
ES1  
BCT 6MIN  
RNG 4.7NM  
BRG 78.5°R  
060  
070  
080  
090  
CSE 264.0°T BT TRU  
SPD 12.3K BT TRU  
CPA 0NM  
02  
TCPA 23MIN  
BCR 0MIN  
BCT 23MIN  
1
0
20  
N
S
280  
270  
260  
40  
60  
W
E
80  
2
100  
-30 20 10  
DEPTH  
21.1m  
CURRENT 1.2KT  
105.7°R  
11.3KT  
285.6  
100  
WPT 2  
150.8NM  
155.0°T  
11.7NM  
162.5°T  
250  
240  
110  
120  
01 +  
OWN SHIP GPS  
34°40.849N  
125°18.115E  
+ CURSOR POSN  
34°39.039N  
X-Band  
A/C AUTO  
NOISE  
230  
130  
135°18.303E  
TRUE TRAIL  
140  
220  
3MIN 1:25  
TGT ALARM 1  
TGT ALARM 2  
12MAR 1998  
REJ  
13:28  
210  
150  
OFFCENTER  
Long-1  
EBL  
287.2° R  
240.0° R  
... SIGNAL MISSING ...  
200  
160  
GYRO LOG EPFS TRIGGER  
VIDEO AZIMUTH HEAD LINE  
... ARPA ALARM ...  
190  
170  
180  
VRM  
10.75NM  
7.00NM  
COLLISION GUARD LOST  
TARGET FULL (AUTO + MAN)  
INDEX LINE  
140.9  
°
-1.29-  
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Target 2 is on a collision course as the extension of the vector goes through the own ship  
position. Placing the offset EBL will be a help for assessment. TCPA is counted up to 99.9  
min and beyond this it is indicated as TCPA > 99.9 MIN.  
Note: EPA requires own ship's speed input (automatic or manual) and a heading signal. The  
vector and data is updated automatically every 1-2 scenes between plot entries, but do not  
neglect to plot a new position over a long period of time. The accuracy will be reduced. Note  
the plots will be lost when the compass fails; start the plotting exercise again.  
Plotting a target  
To perform electronic plotting:  
1. Place the cursor(+) on a target of interest by operating the trackball.  
2. Press the ACQ key and one of numeric keys, and the plot symbol with number appears at  
the cursor position.  
3. Watching the EPA time shown at the upper right margin of the screen, wait for at least 30  
seconds. Place the cursor (+) on the target at its new location, press the ACQ key, and the  
same numeric key for the target.  
The plot symbol moves to the new target position and previous position is marked by a  
small dot.  
4. To acquire other targets, repeat the above steps selecting different plot number.  
Note: If a target once plotted is not plotted again within 10 minutes, the warning "UPDATE  
PLOT" will appear in red on the upper right margin of the screen and the plot symbol of the  
target flashes. If you want to continue plotting this target, reacquire it within 5 minutes.  
Otherwise, the target will be regarded as a "lost target" and its plot symbol and target data will  
be erased. The larger the plotting interval, the less accurate the plotted target data. Plotting of  
each target should normally be made every 3 or 6 minutes as far as possible. You can use a  
Watch Alarm to warn yourself every 3 or 6 min or whichever you may set.  
Within 5 seconds, you can cancel a last plot by CANCEL key and make a re-entry at a  
different position. After 5 seconds, the last entry is processed to produce a vector.  
True or relative vector  
Vectors can be displayed relative to own ship's heading (Relative) or with reference to the  
north (True). Press the VECTOR key to select the required mode. This feature is available in  
all presentation modes (gyrocompass must be working correctly). The current vector mode is  
indicated at the upper-right corner of the screen.  
Vector time  
Vector time (or the length of vectors) can be set to 30 seconds, 1, 2, 3, 6, 12, 15 or 30 min and  
the selected vector time is indicated at the upper-right corner of the screen.  
1. Press the PLOT MENU key, and [1] key several times until the desired vector time is  
reached.  
-1.30-  
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[EPA]  
1 VECTOR TIME  
30SEC/1/2/3/6/12/15/30 MIN  
2 COLLISION ALARM OFF/ON  
CPA x.x NM*  
TCPA xx.x MIN*  
STD/LARGE  
OFF/ON  
*: Setting range  
CPA: 0.0 to 9.9 NM  
TCPA: 1.0 to 99.9 MIN  
3 MARK  
4 PLOT NO.  
2. Press the [ENTER] key to confirm your selection.  
3. Press the PLOT MENU key to close the menu. The vector tip shows an estimated position  
of the target after the selected vector time elapses. It can be valuable to extend the vector  
length to evaluate the risk of collision with any target.  
Target data  
The radar calculates motion trends (range, bearing, course, speed, CPA and TCPA) of all  
plotted targets.  
In head-up and head-up true bearing modes, target bearing, course and speed shown in the  
upper-right target data field become true (T) relative to north or relative (R) relative to own  
ship in accordance with true/relative vector setting. In north-up, course-up, and True Motion  
modes, the target data field always displays true bearing, true course and speed over the  
ground.  
Reading the target data  
Press the ACQ key and corresponding numeric key, and the following target data is displayed.  
RNG/BRG (Range/Bearing): Range and bearing from own ship to last-plotted target with  
suffix "T" (True) or "R" (Relative) plot symbol.  
CSE/SPD (Course/Speed): Course and speed are displayed for the last-plotted target with  
suffix "T" (True) or :"R" (Relative) plot symbol.  
CPA/TCPA: CPA (Closest Point of Approach) is a closest range the target will approach to  
own ship. TCPA is the Time to CPA. Both CPA and TCPA are automatically calculated.  
TCPA is counted up to 99.9 min and beyond this, it is indicated as TCPA > *99.9 MIN.  
BCR/BCT: BCR (Bow Cross Range) is the range at which target will cross own ship's bow.  
BCT (Bow Cross Time) is the estimated time at which target will cross own ship's bow. If  
BCR is negative, BCR/BCT readout should be displayed as *.*.  
Terminating target plotting  
With EPA you can plot up to 10 targets. You may wish to terminate plotting of less important  
targets to newly plot other threatening targets.  
By Symbol: To terminate plotting of a certain target, press the TARGET CANCEL key and  
then press the corresponding plot number key.  
With Trackball: Place the cursor (+) on a target which you do not want to be tracked any  
longer by operating the trackball and press the TARGET CANCEL key.  
All Targets: To terminate plotting of all targets at once, press and hold the TARGET  
-1.31-  
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CANCEL key until all plot symbols and marks disappear in about 3 seconds.  
Setting CPA/TCPA Alarm Ranges  
When the predicted CPA of any target becomes smaller than a preset CPA alarm range and its  
predicted TCPA less than a preset TCPA alarm limit, the EPA releases an aural alarm and  
displays the warning label COLLISION on the screen. In addition, the EPA symbol changes  
to a triangle and flashes together with its vector.  
Provided that this feature is used correctly, it will help prevent the risk of collision by alerting  
you to threatening targets. It is important that GAIN, A/C SEA, A/C RAIN and other radar  
controls are properly adjusted.  
CPA/TCPA alarm ranges must be set up properly taking into consideration the size, tonnage,  
speed, turning performance and other characteristics of own ship.  
CAUTION  
CPA/TCPA  
The CPA/TCPA alarm feature should never be relied upon as the sole means for detecting the  
risk of collision. The navigator is not relieved of the responsibility to keep visual lookout for  
avoiding collisions, whether or not the radar or other plotting aid is in use.  
To set the CPA/TCPA alarm ranges:  
1. Press the PLOT MENU key to show the EPA menu.  
2. Press the [2] key to select COLLISION ALARM ON. At this point, a highlight cursor  
appears at the "CPA x.x NM" field.  
3. Enter the CPA alarm range in nautical miles (0.0 to 9.9 nm) without omitting leading  
zeroes, if any, and press the ENTER key. The highlight cursor now moves to the "TCPA  
xx.x MIN" field.  
4. Enter the TCPA alarm limit in minutes (1.0 to 99.9 min) without omitting leading zeroes, if  
any, and press the ENTER key.  
5. Press the PLOT MENU key to close the menu.  
-1.32-  
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Silencing CPA/TCPA audible alarm  
Press the AUDIO OFF key to acknowledge and silence the CPA/TCPA audible alarm.  
The warning label COLLISION and the flashing of the triangle plot symbol and vector remain  
on the screen until the dangerous situation is gone or you intentionally terminate tracking of  
the target by using the CANCEL key.  
Changing size of the plotting symbols  
You can change the size of the plotting symbols as the procedure shown below:  
1. Press the PLOT MENU key to show the EPA menu.  
2. Press the [3] key two or three times until plot symbol size option STD (standard) or  
LARGE is highlighted.  
3. Press the ENTER key to conclude your selection followed by the PLOT MENU key to  
close the PLOT menu.  
1.25 Entering Own Ship's Speed  
EPA and any azimuth stabilized presentation modes require an own ship speed input and  
compass signal. The speed can be entered from a speed log (automatic) or through the plotting  
keypad (manual).  
Automatic speed input  
1. Press the RADAR MENU key and the [0] key to show the FUNCTIONS 2 menu.  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
LOG/NAV*/MAV  
MAN = xx.xKT (STW/SOG)  
OFF/MAN  
SOG (Speed-over-the-ground) is the Speed Made  
Good over the ground determined by EPFS, Echo  
Reference or Dual-axis speed log. It is obtained  
by a distance between two points over the ground  
divided by the time spent for travelling between  
those two points  
7 SET, DRIFT  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
*:R- type only  
2. Press the [6] key to select menu item 6 SHIP SPEED.  
3. Press the [6] key to select (or highlight) LOG option.  
-1.33-  
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4. When the serial speed data is selected at the installation menu, select the speed mode,  
STW (speed through the water) or SOG (speed over the ground). If pulse speed data is  
selected, the STB/SOG does not appear.  
5. Press the ENTER key to confirm your selection followed by the RADAR MENU key to  
close the FUNCTIONS menu. The ship's speed readout at the screen top shows own  
ship's speed fed from the speed log followed by the label "LOG."  
Notes:  
1) IMO Resolution A.823(19) for ARPA recommends that a speed log to be interfaced with  
an ARPA should be capable of providing through-the-water speed.  
2) Be sure not to select LOG when a speed log is not connected. If the log signal is not  
provided, the ship's speed readout at the screen top will be blank.  
3) SPEED **.* and SIGNAL MISSING “ LOG” appears if no log signal is present for 30 s  
while the ship speed has been more than 5.0 kt.  
4) With the serial speed inputs and SOG selection, if the type of data is changed from SOG  
to STW, the label SOG appears in red at the upper right corner on the screen.  
Manual speed input  
1. Press the RADAR MENU and [0] key to show the FUNCTIONS 2 menu.  
2. Press the [6] key to select menu 6 SHIP'S SPEED.  
3. Press the [6] key to select (or highlight) MAN option.  
4. Press the ENTER key to confirm selection. At this point, "MAN = XX.X KT" appears on  
the FUNCTIONS 2 menu.  
5. Enter the ship speed by hitting corresponding numeric keys followed by the ENTER  
without omitting leading zeros, if any. For example, if the ship speed is 8 knots, [0] [8]  
[ENTER].  
6. Press the RADAR MENU key to close FUNCTIONS menu. The ship speed readout at the  
screen top shows own ship speed entered followed by the label "MAN."  
-1.34-  
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1.26 Target Trails (Echo Trails)  
It is possible to display the trails by the radar echoes of targets in the form of synthetic  
afterglow. The afterglow can be selected in a single tone or gradual shading as set on RADAR  
1 menu.  
Trail gradation  
Echo trails may be shown in monotone or gradual shading. Gradual shading paints the trails  
getting thinner with time just like the afterglow on an analog PPI radar.  
(Monotone (SGL))  
(Gradual shading (MULT))  
- Press the [7] key to select menu item 7 TRAIL GRAD (graduation) in step 4, and  
- Press the [7] key to select (or highlight) SGL (single tone) or MULT (multiple shading)  
option in step 5.  
True or relative trails  
You may display echo trails in true or relative motion (only true trail on TM). Relative trails  
show relative movements between targets and own ship. True motion trails require a  
gyrocompass signal and own ship speed input to cancel out own ship's movement and present  
true target movements in accordance with their over-the-ground speeds and courses.  
(b) Relative target trails - all  
targets moving relative to own  
ship  
(a) True target trails - no smearing  
of stationary targets  
Note: When true trail is selected on the RM mode, the legend TRUE TRAIL appears in red.  
No true-relative selection on TM, it is only True trails on TM mode.  
To select true or relative echo trail presentation:  
1. Press the RADAR MENU key to show the FUNCTIONS 1 menu.  
2. Press the [0] key twice for FUNCTION 3 menu, then [2] key to show the RADAR 1 menu.  
3. Press the [6] key to select menu item 6 TRAIL.  
4. Press the [6] key to select (or highlight) REL (Relative) or TRUE option.  
5. Press the ENTER key to confirm your selection; then RADAR MENU key to close the  
menu.  
-1.35-  
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Press [RADAR MENU] key.  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM*  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
Press [0] key.  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
7 SET, DRIFT  
OFF/MAN  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
*: R-type only  
Press [0] key.  
[FUNCTIONS 3]  
1 [FUNCTIONS 2]  
[RADAR 1]  
1 [FUNCTIONS 3]  
2 [RADAR 1]  
2 EBL 1 *  
3 EBL 2 *  
4 VRM 1 *1  
5 VRM 2 *1  
6 TRAIL  
REL/TRUE  
REL/TRUE  
3 [FUNCTION KEY 1]  
4 [FUNCTION KEY 2]  
5 [FUNCTION KEY 3]  
6 [FUNCTION KEY 4]  
7 RADAR*  
REL/TRUE  
SGL/MULT  
1/2  
[2] 7 TRAIL GRAD  
8 [PULSE WD 1]  
9 [PULSE WD 2]  
0 [RADAR 2]  
8
9 GYRO SETTING  
EBL = xxx.x°  
0 [FUNCTIONS 4]  
*1: Fishing mode only (one type of R-type)  
-1.36-  
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Displaying and erasing echo trails  
Press the RADAR MENU and [1] key to activate or deactivate the echo trails feature.  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM*  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
*: R-type only  
Each press of the [1] key within 5 seconds cyclically changes echo trail length (time) as  
below:  
OFF - 30 s - 1 min - 3 min - 5 min - 15 min - 30 min - continuous - OFF  
The current echo trail setting is displayed at the lower-right corner of the screen.  
Suppose that "3 MIN" has just been selected. If the [1] key is hit on the FUNCTION 1 menu  
more than 5 seconds later, echo trails are removed from the display (memory still alive with  
echo trail timer count going on). Next hitting of the key calls out the echo trails on the screen.  
To proceed to longer plot intervals, successively push the [1] key with a hit-and-release action.  
The larger the echo trail length, the larger the echo trail plot interval.  
Note: Holding the [1] key depressed for about 3 seconds on the FUNCTION 1 menu will  
cause a loss of echo trail data so far stored in an memory.  
Resetting echo trails  
To reset (or clear) the echo trail memory, hold the TARGET TRAILS CANCEL key  
depressed for about 3 seconds. Echo trails are cleared and the trailing process restarts from  
time count zero at current echo trail plot interval. When memory assigned to echo trailing  
becomes the echo trail timer at the lower-right corner of the screen freezes and the oldest  
trails are erased to show the latest trails.  
R/N/W versions: The TARGET TRAILS CANCEL key can be functioned as follows;  
(a) Pressing the key within 3 seconds after the first press selects the trail time: 30 seconds, 1  
min., and then 3 min.  
(b) Pressing the key after more than 3 seconds from the first press tums off/on the trail  
display.  
(c) Pressing the key for more than 2 seconds turns off the trail display with a beep. The trail  
memory is cleared. The next press for more than 2 seconds turns on the trail display and  
new trailing starts.  
-1.37-  
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1.27 Parallel Index Lines  
Parallel index lines are useful for keeping a constant distance between own ship and a  
coastline or a partner ship when navigating. Index lines are drawn in parallel with the No. 2  
EBL (No. 2 EBL must be active). The orientation of the index lines is controlled with the  
EBL control (without effecting the EBL indication) and the intervals between the lines  
adjusted with the VRM rotary control (provided that No. 2 VRM is active).  
Maximum number of the index line can be set on INITIAL SETTING 3 menu: 2, 3 or 6.  
NO.2 EBL  
Parallel Index Lines  
Displaying and erasing the index lines  
1. Press the RADAR MENU and [4] key, and the index lines appears.  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM*  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
*: R-type only  
2. Orient the index lines in a desired direction with the EBL rotary control. The azimuth of  
the index lines appear at the left bottom of the screen.  
-1.38-  
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Adjusting index line intervals  
1. Press the RADAR MENU and [0] key to show the FUNCTIONS 2 menu.  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH  
4 ECHO AVERAGE  
5 ECHO COLOR  
6 SHIP SPEED  
OFF/1/2/3  
OFF/1/2/3  
YEL/GRN/COLOR*  
LOG/NAV*/MAN  
MAN = xx.xxKT  
(STW/SOG)  
7 SET, DRIFT  
OFF/MAN  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
*: R-type only  
2. Press the [8] key to select menu item 8 INDEX LINES.  
3. Press the [8] key to select (or highlight) No. 2 VRM or MAN (manual) option.  
4. Press the ENTER key to conclude your selection.  
5. If you have selected MAN in step 3 above, "MAN = XX.XX NM" appears at the bottom of  
the FUNCTIONS 2 menu. Enter a desired line interval by hitting numeric keys followed by  
the ENTER key without omitting leading zeroes, if any. There are choices of 2, 3 and 6  
index lines but the number of lines visible on the screen may be less than 6 depending on  
the line intervals.  
6. If you have selected NO. 2 VRM in step 3 above, make sure that the No. 2 VRM is active  
and adjust the spacing between the index lines by operating the VRM control.  
7. Press the RADAR MENU key to close the FUNCTIONS 2 menu.  
To erase the index lines;  
1. Press the RADAR MENU key and the [4] key.  
2. Press the RADAR MENU key.  
-1.39-  
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1.28 Origin Mark  
You can mark any reference points, prominent target or a point of particular interest using the  
origin mark feature. These marks (max 10) are geographically fixed, i.e., ground stabilized.  
To display the origin marks, heading signal and own ship position data are required.  
To use the origin mark:  
1. Place the cursor (+) at a point where you want to place a reference mark by operating the  
trackball.  
2. Press the RADAR MENU to show the FUNCTION 1 menu.  
3. Press [3] key. The origin mark appears at the cursor position of which range and bearing  
are indicated at the lower-right section of the screen.  
4. To measure the range and bearing to a target of interest from the origin mark, move the  
cursor to the target of interest. Then, the range and bearing from the origin mark to the  
target are shown at the target data display.  
5. To enter another origin mark, press the ENTER key and the [3] key in the FUNCTIONS 1  
menu. Place the cursor where you want to place the origin mark, then press the [3] key.  
6. To erase the origin mark, select the mark number in the FUNCTIONS 1 menu by pressing  
the ENTER key and the [3] key repeatedly, and then press the [3] key once again.  
000  
350  
010  
020  
340  
EPA  
330  
030  
REL VECTOR 6MIN WT  
320  
040  
RNG 3.4NM  
310  
300  
290  
280  
050  
060  
070  
080  
1
BRG 25.5°T  
CSE 264.0°T  
SPD 12.3KT  
CPA 2.9NM TCPA ***MIN  
BCR 2.9NM BCT 20MIN  
2
1
RNG 3.2NM  
2
BRG 45.0°T  
CSE 242°T  
090  
100  
270  
260  
CPA 0.2NM TCPA ***MIN  
BCR **NM BCT **MIN  
Origin  
mark  
250  
240  
110  
120  
130  
WPT 2  
01  
150.8NM  
155.0°T  
230  
3.1NM  
123.5°T  
+
140  
220  
210  
150  
200  
160  
190  
170  
180  
• Origin marks may be affixed with ID numbers or symbols corresponding to the keys in use.  
1 Press the RADAR menu key and [0] [0] [2] [0] and [0] keys to show the RADAR 3 menu.  
2 Press the [5] key twice to select the number or symbol.  
3 Press the ENTER key to conclude your selection.  
R/N/W versions: Pressing a function key can enter an origin mark.  
Note: To enter an origin mark, Gyro and LL are required. If no LL, select DR through the menu.  
-1.40-  
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For easier entry, you can use a FUNCTION key as follows.  
1. Assign origin mark to one of the four function keys as described in the paragraph 1.33.  
2. Use the trackball to place the cursor (+) where you want to display an origin mark.  
3. Press the assigned function key and then press a number key. The origin mark appears with  
number.  
4. To enter another origin mark, repeat steps 2 and 3.  
If you press the number/symbol key for the origin mark which is already displayed, that  
origin mark will disappear.  
The range and bearing from the last-entered origin mark to the cursor are automatically  
displayed in the text data area. To display another origin mark data;  
1. Place the cursor on the origin mark whose range and bearing you want to display.  
2. Press the function key assigned to origin mark entry twice.  
1.29 Zoom  
The zoom function is available on the R-type radar only. This enlarges an area of interest as  
large as twice the normal viewing.  
1. Place the cursor (+) close to the point of interest by operating the trackball.  
2. Press the RADAR MENU to show FUNCTION 1 menu.  
3. Press [5] key. The area around the cursor and own ship is enlarged twice as large as the  
original size and the label ZOOM appears at the lower-left corner of the screen.  
4. To cancel zoom, press the [5] key again on the FUNCTIONS 1 menu.  
Note: The zoom feature is inoperative when the display is off centered.  
+
+
Cursor  
Cursor  
(a) Cursor placed at  
point of interest  
(b) Zoom in  
(R-type only)  
-1.41-  
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1.30 Markers  
Heading marker and heading line  
The heading marker and the heading line indicate the ship's heading in all presentation modes.  
The heading line is a line from the own ship position to the outer edge of the radar display  
area and appears at zero degrees on the bearing scale in head-up mode centered; it changes  
the orientation depending on the ship orientation in north-up and true motion modes. The  
heading marker appears as a small circle on the bearing scale to indicate the heading when the  
display is off-centered or is in north-up or TM mode.  
Temporarily erasing heading line, video plotter screen (requires RP-26)  
To temporarily extinguish the heading line and video plotter screen to look at targets existing  
dead ahead of own ship, press the HL OFF key. The heading line reappears when the key is  
released. Note that the video plotter screen (requires Video Plotter RP-26) is also temporarily  
erased when the HL OFF key is pressed.  
R/N/W versions: Pressing HL OFF key outputs + cursor LL ($RATLL) from J450 on the INT  
board. OSD and RSD are also output.  
North marker  
The north marker appears as a short dashed line. In the head-up mode, the north marker  
moves around the bearing scale in accordance with the compass signal.  
Stern marker  
The stern marker (a dot-and-dash line) appears opposite to the heading line. This marker can  
be displayed provided that STERN MK ON is selected on the RADAR 2 menu.  
Own ship symbol  
The own ship symbol ( ) can be displayed/erased on the RADAR 2 menu. The symbol is  
scaled to indicate the length and beam of the vessel. If the largest dimension of the symbol  
gets smaller than 6 mm, the symbol will disappear and own ship will be represented with a  
small dot or circle depending on the range in use.  
NOTE: Details should be entered during installation.  
-1.42-  
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1.31 Menu Keys  
Three menu keys are provided on the right hand corner of the control head, RADAR MENU,  
PLOT MENU and NAV MENU keys.  
RADAR MENU: Permits setting of basic radar parameters.  
PLOT MENU: Permits setting of Electronic Plotting Aids (EPA) parameters or the optional  
ARPA ARP-26.  
NAV MENU: Provides a choice of navigation data for on-screen display. Also selects display  
data for the optional Video Plotter.  
HL  
PANEL  
BRILL  
MODE  
3
AUDIO  
OFF  
RADAR  
MENU  
PLOT  
MENU  
NAV  
MENU  
OFF  
2
1
OFF  
VECTOR  
5
LOST  
CENTER  
TARGET  
4
6
ACQ  
EBL  
CHART  
ALIGN  
MARK  
9
OFFSET  
TARGET  
DATA  
7
8
TARGET  
TRAILS  
CU, TM  
RESET  
A/C  
AUTO  
TARGET  
CANCEL  
CANCEL  
0
ENTER  
Note: Menu automatically goes off in 30 seconds if you do not press any key.  
-1.43-  
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1.32 RADAR 1, 2 and 3 Menu Settings  
Press [RADAR MENU] key.  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM *  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
*: R-type only  
Press [0] key.  
[FUNCTIONS 2]  
2 Background color - Character color  
BLACK ... Green character  
BLACK ....Red character  
BLUE .....Display area  
BLUE  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
BRIGHT BLUE  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
LOG/NAV*/MAN  
MAN = xx.x KT  
(STW/SOG)  
7 SET, DRIFT  
OFF/MAN  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
*: R-type only  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
Press [0] key.  
[FUNCTIONS 3]  
1 [FUNCTIONS 2]  
2 [RADAR 1]  
3 [FUNCTION KEY 1]  
4 [FUNCTION KEY 2]  
5 [FUNCTION KEY 3]  
6 [FUNCTION KEY 4]  
7 RADAR*  
7 RADAR: Select 1 for single radar installation or for connecting  
to antenna NO. 1 on dual radar installation. , 2 for connecting to  
antenna NO. 2 on dual radar installation.  
1/2  
8
9 GYRO SETTING  
0 [FUNCTIONS 4]  
Press [2] key.  
EBL = xx.x°  
-1.44-  
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[RADAR 1]  
1 [FUNCTIONS 3]  
2 EBL 1 *  
REL/TRUE  
3 EBL 2 *  
REL/TRUE  
NM/KM  
NM/KM  
REL/TRUE  
SGL/MULT  
4 VRM 1 *1  
5 VRM 2 *1  
6 TRAIL  
7 TRAIL  
8 [PULSE WD 1]  
9 [PULSE WD 2]  
0 [RADAR 2]  
Press [0] key.  
[RADAR 2]  
1 [RADAR 1]  
2 + CURSOR EBL  
3 NOISE REJ  
4 STERN MK*  
5 SHIP MK  
REL/TRUE  
OFF/ON  
OFF/ON  
OFF/ON  
6 ALARM*  
7 KEY BEEP*  
8 AUDIO ALARM  
9 2ND ECHO REJ  
0 [RADAR 3]  
OFF/L/M/H  
OFF/L/M/H  
OFF/ON  
8 AUDIO ALARM level : 65/70/80 dB (A)  
Press [0] key.  
[RADAR 3]  
1 [RADAR 2]  
2 BARGE MK *2  
3 BARGE SIZE *2  
OFF/ON  
LENGTH=XXX ft  
WIDTH = xx ft  
4 [BARGE INFORMATION ] *2  
5 ORIGIN MK DISP  
6 ORIGIN MK STAB  
No./SYMBOL  
GND/SEA  
7 ANTENNA REVOLUTION  
LOW/HIGH  
1/2  
MAN/AUTO  
8 RADAR NO.*  
9 TUNE  
0 TUNE INITIALIZE  
*: R-type only  
*1: Fishing mode only (one type of R-type)  
*2: SM only (one type of R-type)  
-1.45-  
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1.33 Function Keys  
The four function keys (#1-4) on the control head serve for a macro function to instantly  
select a combination of assigned functions or settings. The function keys provide optimum  
radar settings for a specific purpose with a single key operation.  
Each function key can be assigned a combination of particular radar settings that will be most  
suited to your specific navigating purpose, and an adhesive label (such as BUOY, HARBOR,  
COAST or the like) is usually attached to the key top for easy identification of the assigned  
purpose.  
The individual function keys are preset, or programmed, for the following purposes by  
qualified service personnel at the time of installation using the procedures described in the  
succeeding paragraphs:  
Function keys #1, #2 and #3: Picture setup and specific operation  
Function key #4: Specific operation or watch alarm  
POWER  
BRILLIANCE  
A/C RAIN  
A/C SEA  
GAIN  
ON  
PM  
ANTENNA  
#1  
#3  
#2  
STBY  
TX  
OFF  
ON  
TUNE  
EBL  
RANGE  
#4  
DEGAUSS ERR  
FUNCTION KEYS  
#1: SET-UP 1  
#2: SET-UP 2  
#3: SET-UP 3  
#4: SET-UP 4  
1.33.1 Picture setup  
Suppose that you have been navigating along a coast for hours and now you are approaching  
a harbor, your final destination. You will have to adjust your radar to change from the settings  
for coastal navigation to those for harbor approach. Every time your navigating environment  
or task changes, you must adjust the radar, which can be a nuisance in a busy situation.  
Instead of changing radar settings case by case, it is possible to assign the function keys to  
provide optimum settings for often encountered situations.  
The radar's internal computer offers several picture setup options to be assigned to each  
function key for your specific navigating requirements. For instance, one of the function keys  
may be assigned the buoy detecting function and labeled BUOY on the key top. If you press  
this key, the radar will be instantly set for optimum detection of navigation buoys and similar  
objects and the label BUOY is shown at the left margin of the screen. If you re-press the same  
key, the radar returns to the previous settings.  
-1.46-  
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The picture setup options assignable to any of the function keys are shown in the table below:  
LABEL  
BUOY  
DESCRIPTION  
LABEL  
DESCRIPTION  
Optimum setting for detecting  
vessels  
Optimum setting for detecting SHIP  
navigation buoys, small vessels  
and other small surface objects  
Optimum setting for short range LONG  
detection using a range scale of  
3 nm or less on calm seas  
SHORT  
Optimum setting for long range  
detection using a range scale of  
6 nm or larger  
CRUISING For cruising using a range scale HARBOR Optimum setting for short range  
of 1.5 nm or larger  
navigation in a harbor area  
using a range scale of 1.5 nm or  
less  
COAST  
For coastal navigation using a SEA  
range of 12 nm or less  
Transoceanic voyage using a  
range scale of 12 nm or larger  
Optimum setting for navigation  
on a river  
ROUGH  
SEA  
Optimum setting for rough  
weather or heavy rain  
RIVER  
Each picture setup option defines a combination of several radar settings for achieving  
optimum setup for a particular navigating situation. Those involved are interference rejector,  
echo stretch, echo average, automatic anti-clutter, pulselength and noise rejector settings.  
Adjusting these features on a function key menu changes the original function key settings.  
To restore the original settings for a particular function key, it is necessary to display the  
relevant function key menu and select appropriate menu options.  
Note: Function key presetting requires a good knowledge of optimum radar settings. If you  
want to change the original function key settings, consult your nearest FURUNO  
representative or dealer.  
1.33.2 Specific operation  
Most often used controls are placed on the center panel while less often used controls are  
provided in the menu. To avoid opening the menus to set up the radar for a particular  
situation, function keys #1, #2, #3 and #4 may be assigned a combination of the following  
settings at the time of installation.  
- Target trails (See paragraph 1.25.)  
- Echo stretch 1,2 or 3 (See paragraph 1.22.)  
- Pulselength 1 or 2 (See paragraph 1.11.)  
- Echo averaging 1, 2 or 3 (See paragraph 1 .23.)  
- Echo color (See paragraph 1.32.)  
- Panel illumination  
- Marks brilliance  
- Noise rejection  
Provided that the function key is assigned the specific operation feature, press the key to instantly  
set the radar for the preset purpose. The corresponding label will be displayed at the left margin of  
the screen. If you re-press the function key, the radar returns to the previous settings.  
-1.47-  
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1.33.3 Watch alarm  
The watch alarm sounds an external buzzer at selected time intervals to help you keep regular  
watch of the radar picture for safety or other purposes. This feature can be assigned to  
function key #4 with a choice of alarm intervals of 6, 10, 12, 15 and 20 minutes. (See the  
flowchart for keystroke sequence.)  
Provided that function key #4 is assigned the watch alarm feature, just press function key #4  
to activate the feature. The label WATCH appears at the lower-left corner of the screen  
associated with a watch alarm timer counts down from the initial value (e.g., "12:00").  
When a preset time interval has elapsed, an audible watch alarm is released and the screen  
label WATCH turns red and the watch alarm timer freezes at "0:00."  
To silence the alarm, press the AUDIO key. The label WATCH turns to normal color and the  
watch alarm timer is reset to the initial value and starts the count-down sequence again.  
If you press the AUDIO OFF key before the selected time interval is reached, the watch alarm  
timer is reset to the initial value and starts the count-down sequence again.  
-1.48-  
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1.33.4 Setting for function keys #1/#2/#3  
[FUNCTION KEY 1]  
1 [FUNCTIONS 3]  
(PICT)  
RADAR MENU  
2 FUNCTION KEY 1  
3 PICTURE  
PICTURE/OPERATION  
FUNC1/BUOY/SHIP/  
SHORT/LONG/CRUISING/  
HARBOR/COAST/SEA/  
ROUGH SEA/RIVER*2/BIRD*1  
OFF/1/2/3  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM *  
1 or 2  
1 to 10  
4 INT REJECT  
5 ECHO STRETCH  
6 ECHO AVERAGE  
7 A/C AUTO  
OFF/1/2/3  
OFF/1/2/3  
OFF/ON  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
8 [FUNC 1 PULSE WD]  
9 NOISE REJECT  
0 VIDEO CONTRAST 1/2/3  
OFF/ON  
9 VIDEO PLOT  
0 [FUNCTIONS 2]  
[8]  
[0]  
[FUNC 1 PULSE WD]  
S1/S2  
1 [FUNCTION KEY 1]  
2 0.5 NM  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK (GRN CHAR)/  
3 0.75 NM S1/S2/M1  
S/M1  
S/M1  
4 1.5 NM  
5 3 NM  
6 6 NM  
S1/S2/M1  
S2/M1/M2/M3 S/M1/M2  
M1/M2/M3/L M1/M2/L  
BLK (RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
7 12-24 NM M2/M3/L  
M2/M3/L  
(In the case of FR-2115/2125)  
BRT BLU  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
[3]  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
[2] [2] to toggle between  
OPERATION and PICTURE menu.  
7 SET, DRIFT OFF/MAN  
SET = xxx.x°  
DRIFT = xx.xKT  
NO.2 VRM/MAN  
MAN = xx.xx NM  
8 INDEX LINES  
[FUNCTION KEY 1]  
(OPR)  
9 BRILLIANCE (1)  
0 [FUNCTIONS 3]  
1 [FUNCTIONS 3]  
2 FUNCTION KEY 1  
3 OPERATION  
PICTURE/OPERATION  
TARGET TRAILS/  
[0]  
TARGET ALALRM/ARPA/VECTOR TIME *  
VIDEO PLOT/ZOOM *  
BKGD COLOR/INDEX LINES/  
INT REJECT/2ND ECHO/ORIGIN MARK/  
PLS WD 1/PLS WD 2/  
[FUNCTIONS 3]  
1 [FUNCTIONS 2]  
2 RADAR 1  
ECHO STRETCH 1/2/3  
ECHO AVG 1/2/3  
ECHO COLOR/  
CHAR BRILL/MARK BRILL/  
TRAIL BRILL/RINGS BRILL/  
EBL BRILL/VRM BRILL/  
+CURSOR BRILL/HL BRILL/  
PLOT BRLL/L/L BRILL/  
3 [FUNCTION KEY 1]  
4 [FUNCTION KEY 2]  
5 [FUNCTION KEY 3]  
6 [FUNCTION KEY 4]  
[4]  
7 RADAR*  
1/2  
8 INTER SWITCH  
9 GYRO SETTING  
EBL = xxx.x°  
CHART BRILL/NOISE REJECT/  
BARGE INFORATION*2  
0 [FUNCTIONS 4]  
*: R-type only  
*1: Fishing mode only (one type of R-type)  
*2: SM only (one type of R-type)  
-1.49-  
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Picture setup default for Function Keys 1, 2 and 3  
4. INT  
Reject  
5. ES  
6. ES  
7. A/C 9. Noise P/L on P/L on P/L on P/L on 3 P/L on P/L on  
Auto  
Rejector 0.5 nm 0.75 nm 1.5 nm nm  
65 nm 12-24  
nm  
RIVER  
BUOY  
SHIP  
2
3
3
2
3
3
3
2
2
2
2
1
OFF  
3
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
ON  
OFF  
ON  
S1  
S1  
S1  
S1  
S2  
S2  
S1  
S1  
S1  
S1  
S1  
S1  
S2  
S2  
S1  
S2  
S2  
S1  
S1  
S2  
S1  
S2  
S1  
M1  
M1  
S1  
M1  
M1  
S1  
S2  
M1  
S2  
M1  
S2  
M2  
M2  
S2  
M2  
M2  
S2  
M2  
M2  
M2  
M2  
M1  
M3  
M3  
M1  
M3  
M3  
M1  
M2  
M3  
M3  
M3  
M2  
L
2
2
3
ON  
L
SHORT  
LONG  
CRUISING  
HARBOR  
COAST  
SEA  
OFF  
2
OFF  
3
OFF  
ON  
M2  
L
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
3
ON  
L
OFF  
OFF  
3
OFF  
OFF  
OFF  
OFF  
OFF  
M2  
L
L
BIRD  
3
L
ROUGH  
SEA  
2
L
-1.50-  
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1.33.5 Setting for function key #4  
RADAR MENU  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM *  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTIONS 2]  
[0]  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK (GRN CHAR)/  
[FUNCTION KEY 4]  
1 [FUNCTIONS 3]  
2 FUNCTION KEY 4 OPERATION/WATCH ALARM  
3 OPERATION TARGET TRAILS/  
TARGET ALARM/ARPA/VECTOR TIME *  
VIDEO PLOT/ZOOM*  
BKGD COLOR/INDEX LINES/  
INT REJECT/2ND ECHO/ORIGIN MARK/  
PLS WD1/PLS WD 2/  
(OPR)  
BLK (RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH  
OFF/1/2/3  
ECHO STRETCH 1/ 2/ 3  
4 ECHO AVERAGE OFF/1/2/3  
ECHO AVG 1/ 2 / 3  
ECHO COLOR/  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
CHAR BRILL/MARK BRILL/  
TRAIL BRILL/RINGS BRILL/  
EBL BRILL/VRM BRILL/  
+CURSOR BRILL/HL BRILL/  
PLOT BRILL/L/L BRILL  
7 SET, DRIFT OFF/MAN  
SET = xxx.x°  
DRIFT=xx.xKT  
NO.2 VRM/MAN  
MAN = xx.xx NM  
CHART BRILL/ NOISE REJECT/  
BARGE INFORMATION*2  
8 IDX LINES  
9 BRILLIANCE (1)  
0 [FUNCTIONS 3]  
Press [2] once or twice to toggle  
between OPERATION and WATCH  
ALARM followed by ENTER key.  
[0]  
[6]  
[FUNCTIONS 3]  
1 [FUNCTIONS 2]  
2 [RADAR 1]  
3 [FUNCTION KEY 1]  
4 [FUNCTION KEY 2]  
5 [FUNCTION KEY 3]  
6 [FUNCTION KEY 4]  
[FUNCTION KEY 4]  
1 [FUNCTIONS 3]  
2 FUNCTION KEY 4 OPERATION/WATCH ALARM  
3 WATCH ALARM INTERVAL  
(WATCH ALARM)  
[6]  
7 RADAR*  
1/2  
8
6/10/12/15/20 MIN  
9 GYRO SETTING  
EBL = xxx.x°  
0 [FUNCTIONS 4]  
*: R-type only  
*1: Fishing mode only (one type of R-type)  
*2: SM only (one type of R-type)  
-1.51-  
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1.34 Barge information  
Do the following to display the barge information. This function is not available in all radar.  
1. Press the RADAR MENU, [0],[0],[2],[0] and [0] to reach the RADAR 3 menu.  
2. Press [2] key twice to select BARGE MK ON, followed by the ENTER key.  
3. Press [3] key to select BARGE SIZE and enter length and width of a barge, followed by the ENTER  
key.  
4. Press [4] key to display BARGE INFORMATION menu.  
5. Enter number of barges in first row, followed by the ENTER key.  
6. Enter the number of barges for 2nd, 3rd, 4th and/or 5th row followed by the ENTER key. The barge  
information appears on the radar display.  
1.35 Radar Map  
A radar map is a combination of map lines and symbols whereby the user can define and  
input the navigation, route planning and monitoring data on the radar equipment. Map lines  
are navigational facility whereby the observer can define lines to indicate channels or traffic  
separation schemes. Also called nav lines, these lines can be ground stabilized to stop them  
drifting. (Definition in Annex C of IEC 60936-1 and IEC 60872-1)  
In this series of radar, a radar map may contain 150 points of mark and line data on one map.  
10 maps can the memorized to facilitate the repeated use on the routine navigation area.  
The user can create a radar map on-real time base while using the radar for navigation or at  
leisure time at anchor or while the radar is not being used. Place of a map can be made for  
any waterways apart from the actual own ship location. The map data is stored on EEROM  
card which is mounted on the main processor board socket. When the optional Video Plotter  
board RP-26 and RAM card are installed in the display unit, much more data can be created  
and copied to another card.  
General operation procedure:  
1. Press the NAV MENU key to show the NAV INFORMATION 1 menu.  
2. Press [2] key to select the SELECT NAVAID operation.  
3. Press [2] key again to select navigation data input device, followed by the ENTER key.  
4. Also, set other nav data parameters as appropriate referring to the operation flow shown on  
the next page.  
5. Press the NAV MENU key to close the NAV INFORMATION menu.  
-1.52-  
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Notes:  
1) Own ship position display requires an input from radionavigational equipment such as a  
GPS receiver in accordance with the data format as defined by IEC 61162-1.  
2) Wind, water current, depth, water temperature are not displayed when relevant sensors are  
not fitted and the text are for these is used for displaying another target data.  
1.35.1 Making a radar map  
1. Press the NAV MENU key to display the NAV INFORMATION 1 menu.  
2. Press [1] key to display the RADAR MAP menu.  
3. Press the [2] key twice to set MAP ON, then press the ENTER key.  
4. Press the [8] key to select the MAP DISP SELECT menu.  
[MAP DISP SELECT]  
1 [RADAR MAP]  
2 DANGER HIGHLIGHT  
3 COAST LINE  
4 MARK  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
5 NAV LINE  
6 PROHIBITED AREAS  
7 BUOY  
8 CONTOUR LINE  
9 WPT MARK  
5. Press appropriate numeric key twice to select ON, then press the ENTER key.  
6. Press the NAV MENU key to close the menu.  
Mark entry mode  
Marks can be entered in 3 different ways.  
1. Press the NAV MENU to display the NAV INFORMATION 1 menu.  
2. Press [1] key to display the RADAR MAP menu.  
3. Press [6] key and further press [6] key to select the entry mode - cursor, L/L or own ship  
position.  
4. Press the ENTER key followed by the NAV MENU key.  
5. Press the MARK key to read the following legends.  
-1.53-  
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xx xx. xxx N/S  
*
xxx xx. xxx E/W  
MARK XX  
21 LINE CHANGE  
22 MARK CANCEL  
CANCEL ENTER MARK CANCEL KEY  
*: These appear when L/L mode is selected at the step 3.  
6. Select a wanted position, followed by the ENTER key. Positions can be selected either by  
the Trackball, lat/lon values or at own ship.  
7. Select a desired mark by the corresponding number followed by the ENTER key.  
8. Repeat steps 6-7. To enter the same mark selected, simply repeat step 6.  
9. To erase a mark entered, enter 22, place the cursor to the mark you want to erase and then  
press the CANCEL key.  
10. To escape the mark entry mode press the CANCEL key.  
Example: How to draw a coastline  
1. Press the MARK key.  
2. Enter 17 to select Coast Line and press the ENTER key.  
3. Place the cursor mark on a required position and press the ENTER key.  
4. Place the cursor at a next position and press the ENTER key. One line appears connecting  
designated two points.  
5. Repeat step 4 to establish the coastline.  
6. To enter more than one of the same type of line, after entering one line, enter 21 and press  
the ENTER key. Then, repeat step 2 to 5.  
7.To draw other lines, enter required line no., for example, enter 18 to inscribe a contour line,  
followed by the ENTER key. Repeat step 3.  
8. To erase a line segment entered, enter 22, place the cursor to a point and then press the  
CANCEL key. For example, if point 4 is erased on the figure below, line segment 3-4 is  
erased. If point 3 is erased, line segments 2-3 and 3-4 are erased and new line segment 2-4  
is generated.  
2
4
3
1
-1.54-  
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1.35.2 Storing the map data  
When you have made a map, store it with a map number as follows:  
1. Press the NAV MENU and [1] key to display RADAR MAP menu.  
2. Press [7] key for ENTER MAP menu.  
3. Press [2] key and enter map number by numeral key, followed by ENTER key.  
4. Press the NAV MENU key to leave this menu.  
1.35.3 Displaying radar map  
1. Press the NAV MENU and [1] key in order to display the RADAR MAP.  
2. Press [3] key and enter a map number you want to display.  
3. Press ENTER key.  
North marker  
000  
010  
350  
020  
Separation zone  
340  
Heading marker  
330  
030  
320  
040  
Waypoint  
310  
050  
Navline  
Target being tracked  
W012  
060 Own ship safe contour  
300  
290  
280  
070  
Heading line  
080  
Planned route  
090  
270  
260  
100  
Own ship vector  
250  
110  
240  
120  
Approximate coastline  
W011  
230  
130  
140  
220  
Dangerous side of own  
ship safe contour may be  
marked like this.  
Waypoint  
210  
150  
200  
160  
190  
170  
180  
Past position  
ARPA: Equally time-spaced positions of any targets being tracked.  
Note-not equally geographically spaced.  
EPA: Past plot positions may not be equally time-spaced, up to the  
operator.  
Concept of Radar map, Ground stabilized  
(Above excludes radar pictures. In reality, radar echoes are always displayed)  
4. Press [1] and [7] key in order to display the NAV LINE menu.  
5. Press [4] key twice to select NAV WIDTH ON and enter navigation width in nautical mile.  
6. Press the ENTER key followed by the NAV MENU key.  
-1.55-  
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1.35.4 Erasing contents of a radar map  
1. Press the NAV MENU, [1] and [9] key to display MAP ERASE menu.  
2. Press a wanted number key twice to select OFF or ALL, followed by the ENTER key.  
[MAP ERASE]  
1 [RADAR MAP]  
2 DANGER HIGHLIGHT  
3 COAST LINE  
4 MARK  
5 NAV LINE  
6 PROHIBITED AREAS  
7 BUOY  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
8 CONTOUR LINE  
9 WPT MARK  
3. Press the NAV MENU key to leave the menu.  
Press [NAV MENU\] key.  
[RADAR MAP]  
1 [NAV INFOMATION 1]  
2 MAP OFF/ON  
3 MAP NO. MAP xx  
[NAV INFOMATION 1]  
1 [RADAR MAP]  
2 SELECT NAVAID GPS+LC/DEAD RECKONING  
[ENTER MAP]  
1 [RADAR MAP]  
2 ENTEA MAP MAP xx  
MAP LIST xx xx  
xx xx xx xx  
xx xx xx xx  
4 NAV DATA POSN  
3 OWN SHIP POSN OFF L/L  
4 POSN xx° xx.xxx  
N/S  
5 ALIGN +CURSOR DATA OFF/ON  
6 MARK ENTRY MODE CURSOR/ L/L /OWN SHIP POSN  
7 [ENTER MAP]  
8 [MAP DISP SELECT]  
9 [MAP ERASE]  
9 ERASE MAP MAP xx  
xxx° xx.xxx  
E/W  
5 +CURSOR DATA OFF/ L/L  
6 WPT DATA OFF/REL/TRUE  
7 [NAV LINE]  
8 [WAY POINT]  
9 WIND DATA OFF/ ON  
0 [NAV INFOMATION 2]  
[MAP DISP SELECT]  
1 [RADAR MAP]  
2 DANGER HIGHLIGHT OFF/ON  
[NAV LINE]  
1 [NAV INFOMATION 1]  
2 NAV LINE  
3
4 NAV WIDTH  
3 COAST LINE  
4 MARK  
5 NAV LINE  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
x.xxNM  
6 PROHIBITED AREAS OFF/ON  
[NAV INFOMATION 2]  
7 BUOY  
8 CONTOUR LINE  
9
OFF/ON  
OFF/ON  
1 [NAV INFOMATION 1]  
2 WIND GRAPH OFF/ON  
3 WIND UNIT m/s /KT  
4 CURRENT DATA OFF/ON  
5 CURRENT GRAPH OFF/ON  
6 DEPTH DATA OFF/ON  
7 DEPTH GRATH OFF/ON  
8 DEPTH SCALE 10/20/50/100/  
200/500  
5 WPT NO.  
OFF/ON  
6
7
8 ARRLVAL ALARM  
OFF/ON  
x.xxNM  
OFF/ON/REVISED  
[MAP ERASE]  
1 [RADAR MAP]  
2 DANGER HIGHLIGHT OFF/ALL  
9 TURNING LINE  
3 COAST LINE  
4 MARK  
5 NAV LINE  
OFF/ALL  
OFF/ALL  
OFF/ALL  
9 DEPTH UNIT *1 m/ft  
0 [NAV INFOMATION 3]  
6 PROHIBITED AREAS OFF/ALL  
7 BUOY  
8 CONTOUR LINE  
OFF/ALL  
OFF/ALL  
[WAY POINT]  
1 [NAV INFOMATION 1]  
[NAV INFOMATION 3]  
1 [NAV INFOMATION 2]  
2 WATER TEMPERATUDE *1 OFF/ON  
3 DATE OFF/UTC/LOCAL +00:00H  
4 USED WPL*  
2 WPT MARK  
3
4 WPT LINE  
5 WPT NO.  
OFF/ON  
OFF/ON  
OFF/ON  
NAV LINE/WP  
6
7
8 ARRIVAL ALARM  
OFF/ON  
x.xxNM  
*: R-type only  
*1: Fishing mode only (one type of R-type)  
-1.56-  
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1.36 Suppressing Second-trace Echoes  
In certain situations, echoes from very distant targets may appear as false echoes  
(second-trace echoes) on the screen. This occurs when the return echo is received one  
transmission cycle later, that is, after a next radar pulse has been transmitted.  
To activate or deactivate the second-trace echo rejector:  
1. Press the RADAR MENU, [0], [0], [2] and [0] key to show the RADAR 2 menu.  
2. Press the [9] key to select menu item 2ND ECHO REJ option.  
3. Further press the [9] key to activate (ON) or deactivate (OFF) the second-trace echo  
rejector.  
4. Press the ENTER key to conclude selection followed by the RADAR MENU key to  
close the RADAR menu.  
1.37 Displaying External Waypoint and Navigation Line  
Waypoint or navigation line defined on another navaid can be displayed by setting  
WAYPOINT and NAV LINE menu as follows. To display the menu, press the NAV MENU  
and [8], [2] for waypoint or [7], [2] for navigation line if video plotter is not provided.  
[WAYPOINT]  
1 [NAV INFORMATION 1]  
[NAV LINE]  
2 WPT MARK  
3 WPT  
OFF/ON  
1 [NAV INFORMATION]  
2 NAV LINE  
3
OFF/ON  
4 NAV WIDTH  
OFF/ON  
x.xxxNM  
OFF/ON  
5 WPT NO.  
6
4 WPT LINE  
5 WPT NO.  
OFF/ON  
OFF/ON  
6
7
7
8 ARRIVAL ALARM  
OFF/ALL  
x.xxNM  
OFF/ON/REVISED  
8 ARRIVAL ALARM  
OFF/ON  
x.xxNM  
9 TURNING LINE  
Cross track error correction at  
turning line  
No cross track error correction  
at turning line  
Navigation  
line  
Course  
Turning line  
Turning  
line  
Own ship  
Track  
TURNING LINE: ON  
TURNING LINE: REVISED  
-1.57-  
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1.38 Adjusting Brilliance of Screen Data  
You can adjust relative brilliance levels of various marks and alphanumeric readouts displayed on  
the screen by the steps below:  
1. Press the RADAR MENU key to show the FUNCTIONS 1 menu.  
2. Press the [0] and [9] key to show the BRILLIANCE 1 menu. To display the BRILLIANCE 2  
menu, further press the [9] key.  
3. Select a desired menu item by pressing the corresponding numeric key. As an example, press  
[8] in the BRILLIANCE menu if you want to change the brilliance of target trails.  
4. Further press the same numeric key as you pressed in step 3 above to select or highlight a  
desired brilliance level.  
5. Press the ENTER key to conclude your selection followed by the RADAR MENU key to  
close the FUNCTIONS menu.  
RADAR MENU  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTIONS 2]  
[0]  
[9]  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK (GRN CHAR)/  
[BRILLIANCE 1]  
1 [FUNCTIONS 2]  
2 RINGS BRILL  
3 EBL BRILL  
4 VRM BRILL  
OFF/DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
BLK (RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
5 +CURSOR BRILL OFF/DIM/M1/M2/BRT  
6 CHAR BRILL  
7 MARK BRIL  
8 TRAIL BRILL  
9 HL BRILL  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M/BRT  
BRT BLU  
3 ECHO STRETCH  
OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
0 [BRILLIANCE 2]  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
[0]  
[BRILLIANCE 2]  
7 SET, DRIFT OFF/MAN  
SET = xxx.x°  
1 [BRILLIANCE 1]  
2 PLOT BRILL  
3 L/L GRID BRILL  
4 CHART BRILL  
DRIFT=xx.xKT  
NO.2 VRM/MAN  
MAN = xx.xx NM  
OFF/DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
8 INDEX LINES  
DIM/M1/M2/BRT  
9 BRILLIANCE (1)  
0 [FUNCTIONS 3]  
5 SYMBOLS BRILL DIM/M1/M2/BRT  
-1.58-  
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The table below describes which menu item adjusts the brilliance of which picture element.  
Menu Item  
RINGS  
VRM  
Functions adjusted  
Fixed range rings  
Menu Item  
EBL  
Functions adjusted  
Electronic bearing lines NO. 1, 2  
Variable range markers NO. 1, 2  
Alphanumeric readouts  
Target trails  
+ CURSOR Trackball controlled cursor  
CHAR  
MARKS  
HL  
Bearing scale  
TRAILS  
PLOT  
Heading Line and stern marker  
Latitude and longitude grid lines  
Plots for EPA and ARP-26  
Charts  
L/L  
CHART  
Note: You should adjust the entire CRT brilliance by operating the BRILLIANCE control  
before adjusting the respective brilliance levels on the BRILLIANCE 1 and 2 menu.  
1.39 Display of Wind/Tide/Depth Information  
Wind  
Wind, oceancurrent and depth sounding data can be displayed in the text cell which is  
normally used to indicate third target ship data. Do as below:  
1. Press the NAV menu to show the NAV INFORMATION 1 menu.  
2. Press [9] key twice to set WIND DATA ON and press the ENTER key.  
3. Press [0] key to show NAV INFORMATION 2 menu.  
4. Press [2] key twice to set WIND GRAPH ON and press the ENTER key.  
Echo sounding depth and tide  
1. Do the same to indicate ocean current graph and echo-sounding chart. Depth scales can be  
selected among 10, 20, 50, 100, 200 and 500 m. The echogram shows the last 30 minutes  
of depths along the ship’s track.  
2. Press [0] key to show the NAV INFORMATION menu.  
3. To indicate the date and time in UTC, press [3] key twice or three times to select UTC and  
press ENTER key.  
4. To indicate the local time, press [3] key twice or three times and press ENTER key twice.  
Enter time difference between UTC and local time, followed by the ENTER key.  
Note: Wind data and current data require the respective sensors. The depth data requires an  
adequate echo-sounding equipment. The echogram shows the last 30 minutes of depths  
along the ship’s track. Wind vector shows a direction from which the wind blows in,  
relative to own ship heading, and labeled T *. Wind velocity is a true wind speed as a  
result of compensating for own ship’s speed and orientation. Ocean current (tide) is the  
direction to which the current is flowing away from os position, relative to north.  
* T in this case means a true value meanwhile T denotes “relative to True North” in the  
case of EBLs and target ship vectors.  
-1.59-  
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OS heading  
N
E
Current relative to north,  
full scale 10 kt  
Wind direction relative to OS heading, full  
scale 100 kt. Wind velocity is calculated  
value to exclude the ship's orientation  
and speed  
W
S
Example of Head-up mode  
0
Present depth  
20  
40  
60  
Last 30 minutes  
of depth  
80  
100 m  
30  
20  
10 min  
-1.60-  
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1.40 Alarms  
The table below summarizes alarms which may occur at various warning conditions.  
Warming  
Audible alarm  
2 beeps  
Visual alarm  
To quit alarm status  
Match the on-screen HDG  
readout with the actual compass  
reading, if necessary. Then, press  
the Cancel key to erase the  
message SET HEADING.  
GYRO failure  
HDG label reads “***.*” and the  
message SET HDG appears at  
the lower-left corner of the  
screen. GYRZO in red.  
Display is automatically switched  
to head-up mode within 1 min  
(IEC 60936-1/3.12.2.1).  
Target alarm  
(TAZ)  
beeps  
beeps  
Target flashes.  
Press [2] key on Function 1 menu  
(Section 1.20).  
WATCH alarm  
WATCH 0:00  
Press the AUDIO OFF key. The  
label WATCH turns to normal  
video and the timer is reset  
(Section 1.32.3).  
(Label WATCH turns red and time  
count freezes at 0:00).  
Own ship lat/lon none  
Cursor lat/lon  
“***.*” In own ship position field  
“***.*” In cursor position field  
Make sure that own ship position  
data is fed from external radionav  
equipment.  
System failure  
none  
Message BRG SIGNAL MISSING Make sure the antenna switch in  
at screen bottom. No radar  
echoes. SYSTEM FAILURE in  
red at the lower left of the display  
during test.  
the tuning compartment is on.  
Incorrect  
keystroke  
double beep  
tone  
none  
Correct keystroke is responded by  
a single beep provided that KEY  
BEEP ON is selected in initial  
settings.  
Log failure  
2 beeps  
LOG **.* and LOG appears in red, If the SDME has failed, use the  
if no log signal is input for 30 s  
while the ship speed has been  
more than 5.0 kt .  
Manual Speed mode or other  
appropriate sensor.  
EPFS failure  
Continuous  
beep  
EPFS in red (EPFS: electronic  
position-fixing system) in the  
warning and indication cell.  
To silence the beep, press the  
AUDIO OFF key.  
Press the CANCEL key to erase  
The indication also appears when message which appears when  
the GPS mode is switched  
between GPS and DGPS.  
GPS mode is switched. Message  
cannot be erased if position signal  
is missing; it is automatically  
erased when signal is restored.  
-1.61-  
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SOG indication  
COLLISION  
none  
The label SOG (Speed Made  
Good) turns red at the top data  
cell when SOG option is selected data even if the SDME regains a  
on the menu and the assoclated  
SDME (Speed and Distance  
Measuring Equipment = Speed  
log) fails to detect a bottom  
tracking speed, resulting in the  
"Speed through the water" (STW)  
mode automatically.  
The radar does not automatically  
reset itself to receive an SOG  
bottom tracking speed. To erase  
SOG indication (red), press keys  
[RADAR menu], [0], [6].  
Continuous  
beep  
TRUE VECTOR none  
indication  
The label TRUE VECTOR turns  
red in the second data cell when  
the TRUE Vector is selected in  
the RM mode, and returns to the  
normal text color in the North-up  
TM mode.  
UPDATE PLOT  
COLLISION  
none  
If you have failed to enter a next  
EPA plot with in 10 min, this  
indication flashes. Plot symbol of important.  
the target also flashes.  
Re-acquire the flashing target  
within 5 min. Leave it if it is not  
Continuous  
beep  
COLLISION comes on when  
EPA- or ATA-tracked target is on tracking of target.  
Take evasive action or terminate  
collision course.  
Then, visual indication goes off.  
Guard Zone  
alarm  
Continouas  
beep  
The label CZ appears in red if a  
target enters to the guard zone.  
Target is masked by a flashing  
inverted triangle.  
Press the AUDIO OFF key to  
acknowledge it.  
GZ OUT  
alarm  
none  
If the range scale has been  
reduced to make one of GZs  
positions more than 1.5 times of  
the range scale, the label GZ  
OUT appears in red.  
CXhange the range scale of GZ.  
-1.62-  
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Chapter 2 OPERATION OF ARPA (Option)  
2.1 General  
The FR-2105 series radar can accommodate an ARPA (Automatic Radar Plotting Aid)  
module ARP-26 complying with IMO A.823 and IEC 60987-1. This chapter describes the  
operation of the ARPA. For operation of normal radar, refer to Chapter 1.  
Principal specifications  
Acquisition and tracking  
• Automatic acquisition of up to 20 targets plus manual acquisition of 10 targets, or fully  
manual acquisition of 30 targets between 0.2 and 32 nm. Manual acquisition has a priority  
over automatic acquisition. Therefore, if 20 targets have been manually acquired, the  
capacity for automatic acquisition is 10 targets.  
• The ARPA automatically tracks all acquired targets, whether manually or automatically  
acquired, between 0.1 and 32 nm (0.1 and 24 nm depending on initial setting). Manually  
acquired targets are indicated in bold symbols and the automatically acquired targets, in  
thinner symbols.  
Vector length: 0.5, 1, 2, 3, 6, 12, 15, 30 min.  
Orientation:  
True velocity or relative velocity  
Stabilization:  
Sea or Ground as selected with Vector key.  
Motion trend: Displayed within 20 scans, full accuracy within 60 scans after acquisition.  
Past positions: Choice of 5, 10 or 20 past positions at intervals of 30 s, 1, 2, 3 or 6 min.  
Alarms:  
Visual and audible alarms against targets violating CPA/TCPA limits, lost  
targets, targets crossing guard zone, system failure and target full status.  
Trial maneuver: Predicted situation appears in 1 min after selected delay (1-60 minutes).  
-2.1-  
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2.2 Keypads for ARPA  
The ARPA uses the keys on the plotting keyboard on the right side of the radar screen and  
two keys on the control head.  
PLOT MENU: Shows/hides ARPA menus.  
Plot Symbol keys: Select specific plot symbols for  
manually acquired targets.  
TARGET CANCEL: Terminates tracking of a  
single target specified by the trackball if the key is  
pressed with a hit-and-release action. If the key is  
held depressed for about 3 seconds, tracking of all  
targets is terminated.  
HL  
PANEL  
BRILL  
MODE  
3
AUDIO  
OFF  
RADAR  
MENU  
PLOT  
MENU  
NAV  
MENU  
OFF  
2
1
OFF  
CENTER  
LOST  
TARGET  
VECTOR  
5
4
6
ACQ  
CHART  
ALIGN  
EBL  
7
MARK  
9
ENTER: Registers menu options selected.  
TARGET  
DATA  
8
TARGET  
TRAILS  
CU, TM  
RESET  
A/C  
AUTO  
TARGET  
CANCEL  
VECTOR: Selects true or relative presentation of  
target vectors.  
CANCEL  
0
ENTER  
TARGET DATA: Displays data on one of tracked  
targets selected by the trackball.  
Plotting keypad  
LOST TARGET: Silences the lost target aural  
alarm and erases the lost target symbol.  
ACQ (on control head): Manually acquires a target.  
AUDIO OFF (on control head): Silences aural  
alarm.  
CRITERIA OF TRACKING  
A target measuring 800 m or more in the radial or circumferential direction is regarded  
as a landmass and not acquired or tracked. Echoes smaller than 800 m are regarded as  
targets to be tracked.  
-2.2-  
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2.3 ARPA Menu Operation  
To activate ARPA function;  
1. Press the RADAR MENU key.  
2. Press [8] key to select ARPA, instead of EPA.  
Note that the label ARPA appears in the upper-right box on the screen.  
Various parameters for the ARPA are set on the ARPA 1 and ARPA 2 menus. To do this,  
follow the steps shown below:  
1. Press the PLOT MENU key to show the ARPA 1 menu.  
2. Press the [0] key once if you wish to go to the ARPA 2 menu.  
3. Select a desired menu item by pressing the corresponding numeric key.  
4. Select a menu option by pressing the same numeric key as pressed in step 3 above. If there  
is more than one option on the current menu item, you may need to press the numeric key  
several times. Press it until the desired option is highlighted. (Note that certain menu items  
will prompt you to enter numeric data or to define points on the radar screen with the  
trackball.)  
5. Press the ENTER key to register settings.  
6. Press the PLOT MENU key to close the menu.  
Press [PLOT MENU] key.  
[ARPA 1]  
1 VECTOR TIME  
2 AUTO ACQ  
3 AUTO ACQ AREA  
4 GUARD ZONE  
5 [GUARD ZONE SET] **]  
6 TARGET BASED SPEED  
30SEC/1/2/3/6/12/15/30MIN  
OFF/ON  
3.6NM/[SET] *  
OFF/ON  
* SET opens the [AUTO ACQ AREA SET]  
submenu which reads:  
1
2
[ARPA1]  
1/2 SET LEFT/RIGHT BOUNDARY  
CANCEL PREVIOUS AREA: CANCEL  
KEY  
7 REFERENCE TARGET VECT OFF/ON  
8 COLLISION ALARM  
OFF/ON CPA  
TCPA xx.xMIN  
x.xKT  
** This submenu reads:  
1
2
[ARPA 1]  
9 [TRIAL MANEUVER]  
0 [ARPA 2]  
1/2 SET LEFT/RIGHT BOUNDARY  
CANCEL PREVIOUS AREA: CANCEL  
KEY  
Press [0].  
[ARPA 2]  
1 [ARPA 1]  
2 TRIAL MODE  
3 HISTORY  
STATIC/DYNAMIC  
OFF/ON  
4 HISTORY POINTS  
5 HISTORY INTVL  
6 MARK SIZE  
7 GUARD, ACQ STABILIZE  
8 [INPUT SIG CHECK]  
9 [ARPA TRACK TEST]  
5/10  
30SEC/1/2/3/6MIN  
STD/LARGE  
NORTH/CRT  
0 [ARPA INITIAL SETTING]  
-2.3-  
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2.4 Start-up Procedure  
Entering own ship's speed  
The ARPA requires own ship's speed and heading data. The speed can be entered  
automatically from a speed log (SDME, Speed and Distance Measuring Equipment), navaid,  
or by referencing to a target-based speed (based on 3 max. stationary objects). Manual input  
is also possible.  
Automatic speed input  
For speed log input:  
1. Press the RADAR MENU key and [0] key to show the FUNCTIONS 2 menu.  
Press [RADAR MENU] key.  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM*  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
Press [0] key.  
[FUNCTIONS 2]  
2 Background color - Character color  
BLACK ... Green character  
BLACK ....Red character  
BLUE .....Display area  
BLUE  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
BRIGHT BLUE  
3 ECHO STRETCH OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 TARGETS COLOR YEL/GRN/COLOR*  
6 SHIP SPEED  
7 SET, DRIFT  
8 INDEX LINES  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
OFF/MAN  
SET = xxx.x°  
DRIFT = xx.xKT  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
* : R-type only  
2. Press the [6] key to select menu item SHIP'S SPEED.  
3. Press the [6] key to select (or highlight) LOG option.  
-2.4-  
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4. Press the ENTER key to conclude your selection followed by the RADAR MENU key to  
close the FUNCTIONS 2 menu. The ship's speed readout at the top of the screen shows  
own ship's speed fed from the speed log preceded by the label "LOG."  
Notes:  
1) IMO Resolution A.823(19) for ARPA recommends that a speed log to be interfaced with  
an ARPA should be capable of providing through-the-water speed data (forward speed).  
2) Be sure not to select LOG when a speed log is not connected. If the log signal is not  
provided, the ship speed readout at the top of the screen will be blank. In the event of a log  
error, you can continue plotting by entering a manual speed.  
3) If a log signal interval becomes more than 30 seconds with the ship's speed 5 kt or more,  
the radar regards the speed log is defective and LOG FAIL appears, reading xx.x KT. If no  
speed input is present for 3 minutes at below 0.1 kt, the radar regards the log is defective.  
Manual speed input  
To manually enter the ship's speed with the numeric keys:  
1. Press the RADAR MENU key and [0] key to show the FUNCTIONS 2 menu.  
2. Press the key [6] to select menu item SHIP'S SPEED.  
3. Press the key [6] to select (or highlight) MAN option.  
4. Press the ENTER key to conclude your selection. At this point, "MAN = xx.x KT" appears  
at the bottom of the FUNCTIONS 2 menu.  
5. Enter the ship speed by hitting corresponding numeric keys followed by the ENTER key  
without omitting leading zeroes, if any. As an example, if the ship speed is 8 knots, press  
[0] [8] [ENTER]. For 4.5 knots, [0] [4] [5] [ENTER].  
6. Press the RADAR MENU key to close the FUNCTIONS 2 menu. The ship speed readout  
at the screen top shows own ship's speed you entered preceded by the label "MENU."  
Target-based speed  
The use of target-based speed is recommended when:  
• The speed log is not operating properly or not connected to the radar.  
• The vessel has no device which can measure ship's leeward movement (Doppler sonar,  
speed log, etc.) when leeward movement can not be disregarded.  
If you select target-based speed, the ARP-26 calculates own ship's speed relative to a fixed  
reference target. The number of targets may be 1, 2 or 3. They appear as tracked targets, each  
shown in a small circle, but without a vector. When a plural of objects are selected, the mean  
value is used for stabilization and speed. Select the number in [PLOT MENU], see section  
2.3.  
1. Select a small fixed island or any radar prominent point located at 0.2 to 24 nm from own  
ship.  
2. Place the cursor (+) on the target by operating the trackball.  
-2.5-  
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3. Press the PLOT MENU key and [6] key followed by the ENTER key.  
The reference target mark (see below) appears at the cursor position and the own ship data  
label changes from "LOG," "NAV" or "MENU" to "REF." Note that it takes 60 scans or  
approximately 1 min before a new speed is displayed. If tracking has failed for a reference  
target, the target is marked with a lost target mark (symbol formed with two triangles).  
R
changes to R in 60 scans  
Notes:  
1) When the reference target is lost or goes out of the acquisition range, the reference target  
mark blinks and the speed reads "xx.x." Select a different reference target in this case.  
2) When all targets are deleted, the reference target mark is also deleted and the target-based  
speed becomes invalid. The speed is indicated in KTBT where BT means Bottom Track  
(speed over ground).  
3) The vector of the reference target can be displayed by menu operation (ARPA 1 menu).  
Canceling target-based speed  
To cancel the target-based speed, the PLOT MENU and [6] key. The speed is shown by LOG,  
NAV* or MANUAL as selected previously.  
Deactivating the ARPA  
To deactivate the ARPA, press the RADAR MENU key and [8] key twice followed by the  
ENTER key. Target plotting symbols and the on-screen label ARPA will disappear. The label  
EPA appears.  
2.5 Automatic Acquisition  
The ARPA can acquire up to 30 targets (20 automatically and 10 manually or all 30 manually).  
If AUTO ACQ is selected after more than 20 targets have been manually acquired, only the  
remaining capacity of targets can be automatically acquired. For example, when 30 targets  
have been acquired manually, then the ARPA is switched to AUTO ACQ. Only 10 targets can  
be acquired automatically.  
A target just acquired automatically is marked with a broken square and a vector appears  
within 20 scans of antenna to indicate the target's motion trend. Within 60 scans, the initial  
tracking stage is finished and the target becomes ready for stable tracking. At this point, the  
broken square mark changes to a solid circle. (Targets automatically acquired are  
distinguished from those acquired manually, the targets which are acquired manually are  
displayed by bold symbol.)  
-2.6-  
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Enabling and disabling auto acquisition  
1. Press the RADAR MENU key and [8] key twice followed by the ENTER and RADAR  
MENU key if the ARPA is not yet activated. Note that the label ARPA appears in the box  
at the upper-right on the screen.  
2. Press the PLOT MENU key to show the ARPA 1 menu.  
[ARPA 1]  
1 VECTOR TIME  
2 AUTO ACQ  
30SEC/1/2/3/6/12/15/30MIN  
OFF/ON  
3 AUTO ACQ AREA  
4 GUARD ZONE  
3 6/[SET]  
OFF/ON  
5 [GUARD ZONE SET]  
6 TARGET BASED SPEED  
7 REFERENCE TARGET VECT OFF/ON  
8 COLLISION ALARM  
OFF/ON CPA x.xKT  
TCPA xx.xMIN*  
9 [TRIAL MANEUVER]  
0 [ARPA 2]  
* Setting range: 1.0 to 99.9 min  
3. Press the [2] key to select menu item AUTO ACQ.  
4. Further press the [2] key to select (or highlight) ON (enable auto acquisition) or OFF  
(disable auto acquisition) as appropriate.  
5. Press the ENTER key to conclude your selection followed by the PLOT MENU key to  
close the ARPA 1 menu. Note that the label AUTO+MAN is displayed in the box at the  
upper-right on the screen when auto acquisition is enabled; MAN when auto acquisition is  
disabled.  
Note: When the ARPA has acquired 20 targets automatically, the message AUTO TARGET  
FULL is displayed in the box at the right-hand side of screen.  
Auto acquisition areas  
Automatic acquisition is performed within 1 or 2 zones. Outside these zones is auto  
acquisition suppressed zones. The zones can be set at 3-3.5 n and/or 5.5-6.0 nm, or anywhere  
within 0.2 - 32 nm.  
Predefined auto acquisition areas (Menu item: 3 & 6 NM)  
1. Press the PLOT MENU key to show the ARPA 1 menu.  
2. Press the [3] key to select menu item AUTO ACQ AREA.  
3. Further press the [3] key to select (or highlight) menu option 3, 6NM.  
4. Press the ENTER key to confirm your selection followed the PLOT MENU key to close  
the ARPA 1 menu.  
-2.7-  
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The illustration below shows how the auto acquisition areas are displayed on the screen. Up to  
20* targets within the auto acquisition areas are acquired automatically. There is no priority in  
picking up. It is recommended to use 2 zones on high speed craft.  
* If 30 targets have already been acquired manually in the MAN ACQ mode (AUTO OFF on  
ARPA 1 menu), only 10 more targets can be acquired automatically.  
5.5-6 nm  
3-3.5 nm  
Predefined auto acquisition areas  
Free selection of acquisition zones (Menu item: SET)  
To set auto acquisition areas with trackball:  
1. Press the PLOT MENU key to show the ARPA 1 menu.  
2. Press the [3] key to select menu item AUTO ACQ AREA.  
3. Further press the [3] key to select (or highlight) SET option.  
4. Press the ENTER key to conclude your selection. At this point the AUTO ACQ SETTING  
menu is displayed at the screen bottom.  
[AUTO ACQ AREA SET]  
1 [ARPA 1]  
2 1/2  
5. Press the [2] key to select menu item "1/2" and press the ENTER key. Then, you will see  
the message as shown below:  
[AUTO ACQ SETTING]  
1 [ARPA 1]  
2 1/2  
SET LEFT/RIGHT BOUNDARY  
CANCEL PREVIOUS AREA: CANCEL KEY  
-2.8-  
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6. Place the cursor at the outer counterclockwise corner of the area (point A) and press the  
ENTER key.  
7. Place the cursor at the clockwise edge of the area (point B) and press the ENTER key.  
0.5 nm  
A
B
Note: If you wish to create an auto acquisition area having a 360-degree coverage around  
own ship, set point B in almost the same direction (approx. ±5°) as point A and press the  
ENTER key.  
8. Repeat steps 5 to 7 above if you want to set another auto acquisition area with the trackball.  
9. Press the [1] key followed by the PLOT MENU key to close the ARPA 1 menu.  
An auto acquisition area like the example shown above appears on the display. Note that each  
auto acquisition area has a fixed radial extension (width) of 0.5 nm.  
Note that the auto acquisition areas are preserved in an internal memory of the ARPA even  
when auto acquisition is disabled or the ARPA is turned off.  
Terminating tracking of targets  
When the ARPA has acquired 20 targets automatically, the message AUTO TARGET FULL  
is displayed in the box at right-hand side of the screen and no more auto acquisition occurs  
unless targets are lost. You may find this message before you set an auto acquisition area.  
Should this happen, cancel tracking of less important targets or perform manual acquisition.  
Canceling individual targets  
Place the cursor (+) on a target to cancel tracking by operating the trackball. Press the  
TARGET CANCEL key.  
Canceling all targets at a time  
Press and hold the TARGET CANCEL key down more than 3 seconds. In the automatic  
acquisition mode, acquisition begins again.  
Discrimination between landmass and true targets  
A target is recognized as a landmass and thus not acquired if it is 800 m or more in range or  
bearing direction.  
-2.9-  
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2.6 Manual Acquisition  
In auto acquisition mode (AUTO ACQ ON), up to 20 targets can be manually acquired in  
addition to 20 auto acquired targets. When auto acquisition is disabled (AUTO ACQ OFF), up  
to 40 targets can be manually acquired and automatically tracked.  
To manually acquire a target:  
1. Place the cursor (+) on a target of interest by operating the trackball.  
2. Press the ACQ key on the control head. The selected plot symbol is marked at the cursor  
position.  
Note that the plot symbol is drawn by broken lines during the initial tracking stage. A vector  
appears in about one minute after acquisition indicating the target's motion trend. If the target  
is consistently detected for three minutes, the plot symbol changes to a solid mark. If  
acquisition fails, the target plot symbol blinks and disappears shortly.  
(a) Immediately after acquisition, this plot  
symbol is shown in broken lines.  
(b) Within 20 scans of antenna after  
acquisition, a vector appears to show a  
trend of movement.  
(c) Within 60 scans of antenna after  
acquisition, the plot symbol changes to a  
small circle indicating steady-state  
tracking condition.  
Notes:  
1) For successful acquisition, the target to be acquired should be within 0.2 to 32 nm from  
own ship and not obscured by sea or rain clutter.  
2) When you have acquired 40 targets manually, the message MAN TARGET FULL is  
displayed at the screen bottom. Cancel tracking of non-threatening targets if you wish to  
acquire additional targets manually. (See "Terminating tracking of acquired targets" on  
page 2-9.)  
-2.10-  
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2.7 Changing Plot Symbol Size  
Press a desired plot symbol key, and the symbol is enlarged for about 7 seconds.  
You may also choose plot symbol size. To choose a large or standard size for all plot symbols:  
1. Press the PLOT MENU key followed by the [0] key to show the ARPA 2 menu.  
2. Press the [6] key to select MARK SIZE.  
3. Further press the [6] key to select (or highlight) STANDARD or LARGE as appropriate.  
4. Press the ENTER key to conclude your selection followed by the PLOT MENU key to  
close the ARPA 2 menu.  
CAUTION - TARGET SWAP  
When a target being tracked nears another target being tracked, the targets may  
be “swapped”. When two targets acquired either automatically or manually come  
close to each other, one of the two may become a Lost Target. Should this  
happen, manual re-acquisition of the Lost Target may be required after the two  
have separated.  
-2.11-  
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ARPA symbols  
The symbols used in this equipment comply with IEC 60872-1.  
Item  
Symbol  
Status  
Remarks  
Automatically  
acquired  
targets  
Initial stage  
epvs symbol no. 3  
Broken square around an echo to  
indicate the target under acquisition and  
initial stage of tracking, before  
steady-state tracking.  
Between 20 and 60 scans of antenna  
after acquisition (vector still unreliable)  
Solid circle with vector indicating steady  
state tracking (60 scans after acquisition)  
Plot symbol changes to an equilateral  
triangle flashing to indicate the target is  
predicted to come into CPA or TCPA.  
epvs symbol no. 3  
Steady tracking  
epvs symbol no. 4a  
CPA alarm  
epvs symbol no. 8  
(flashing)  
(flashing)  
CPA alarm  
acknowledge  
epvs symbol no. 8  
Lost target  
Flashing stops after CPA/TCPA alarm is  
acknowledged.  
Lost target is indicated by flashing  
diamond symbol. The diamond is formed  
from two equal triangles.  
epvs symbol no. 9  
Manually  
acquired  
targets  
Initial stage  
epvs symbol no. 3  
Plot symbol selected for a target  
acquired manually is shown in bold  
broken lines.  
Bold broken square for 20 - 60 scans of  
antenna after acquisition  
Manual plot symbol in a bold solid circle  
(60 scans after acquisition)  
Plot symbol changes to an equilateral  
triangle flashing if a target is predicted to  
come into the preset CPA or TCPA.  
epvs symbol no. 3  
Steady tracking  
epvs symbol no. 4a  
CPA alarm  
(collision course)  
epvs symbol no. 8  
(flashing)  
Flashing stops after CPA/TCPA alarm is  
acknowledged.  
epvs symbol no. 8  
Lost target  
Lost target is indicated by flashing  
diamond symbol. The diamond is formed  
from two equal triangles (one apex up  
and the other apex down).  
Plot symbol changes to an equilateral  
triangle, apex down, flashing together  
(flashing)  
(flashing)  
epvs symbol no. 9  
On target passing  
through  
guard zone  
alarm  
operator-set guard with vector if target entering guard zone.  
zone  
epvs symbol no. 7  
automatic  
acquisition  
area  
5.5 - 6.0 nm, 3 -  
3.5 nm or  
anywhere  
Sector or full circle as selected by the  
operator.  
epvs symbol no. 2  
Target selected  
for data  
On selected target Target data (range, bearing, course,  
1
speed, CPA and TCPA)  
epvs symbol no. 12  
readout  
-2.12-  
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Reference  
target  
On reference target Used to calculate own ship’s  
over-the-ground speed (target-based  
speed) for ground stabilization.  
R
In 60 scans,  
changes to  
R
ARPA symbols (continued)  
ITEM  
Trial maneuver  
SYMBOL  
T
STATUS  
Bottom center  
REMARKS  
Appears during execution of a trial  
maneuver.  
EPVS SYMBOL NO. 10  
(flashing)  
Performance  
test  
Bottom center  
Appears during execution of a  
performance test.  
X X  
EPVS SYMBOL NO. 11A  
(flashing)  
NON-ARPA SYMBOLS for Radar  
ITEM  
SYMBOL  
STATUS  
REMARKS  
Non-ARPA  
symbols  
These are non-ARPA symbols, but only on  
Radar mode. Not available in the ARPA  
mode.  
-2.13-  
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2.8 Adjusting Brilliance of Plot Marks  
1. Press the RADAR MENU and [0] key to show the FUNCTIONS 2 menu.  
2. Press the [9] and [0] key to show the BRILLIANCE 2 menu.  
3. Press the [2] key to select PLOT BRILL.  
4. Further press the [2] key to select (or highlight) a desired brilliance level.  
5. Press the ENTER key to confirm your selection followed by the RADAR MENU key to  
close the BRILLIANCE 2 menu.  
Note: Refer to paragraph 1.37 for the BRILLIANCE menu screen.  
2.9 Displaying Target Data  
The ARPA mode (with built-in ARP-26 optional board) provides the full functionality of  
ARPA as required by the IMO Resolution A.823(19) and IEC 60972-1, including display of  
range, bearing, course, speed, CPA and TCPA of all plotted targets. Data on 3 targets may be  
displayed on the text area at a time.  
In head-up and head-up true bearing modes, target bearing, course and speed shown in the  
upper-right target data field become true (suffix "T") or relative (suffix "R") to own ship in  
accordance with the true/relative vector setting. In north-up, course-up and true motion modes,  
the target data field always displays true bearing, true course and speed over the ground.  
Place the cursor on a desired target and press the [TARGET DATA] key. Target data display  
is as below.  
RNG/BRG (Range/Bearing): Range and bearing from own ship to the selected target with  
suffix "T" (True) or "R" (Relative).  
CSE/SPD (Course/Speed): Course and speed are displayed for the selected target with suffix  
"T" (True) or "R" (relative).  
CPA/TCPA: CPA(Closest Point of Approach) is the closest range a target will approach to  
own ship. TCPA is the time to CPA. Both CPA and TCPA are automatically calculated.  
When the CPA has passed clear of own ship, it is indicated by a TCPA with a negative (-)  
sign. TCPA is counted to 99.9 min and beyond this, it is indicate as TCPA> -99.9MIN.  
-2.14-  
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Target accessed for data readout  
Target on collision course  
Target in GZ  
Target being accessed for data readout  
is marked 1, 2 ,...etc.  
000  
350  
010  
020  
340  
330  
030  
320  
040  
1
RNG  
BRG  
CSE  
SPD  
CPA  
3.4 NM  
25.5°R  
264.0°R  
12.3 KT  
2.9 NM  
310  
300  
050  
060  
070  
080  
1
RNG: Range from own ship to target  
BRG: Bearing from own ship to target  
in R (Relative) or T (True)  
290  
TCPA 12.2MIN  
280  
270  
BCR  
BCT  
1.7NM  
20MIN  
CSE: Course of target, True or  
Relative  
090  
100  
260  
250  
240  
Guard Zone  
SPD: Speed of target  
110  
120  
130  
CPA: Closest Point of Approach of  
target to own ship  
230  
220  
Acquisition Zone  
TCPA: Time to CPA  
140  
210  
150  
BCR: Bow crossing range of target  
BCT: Bow crossing time of target  
200  
160  
170  
190  
180  
2.10 Vector modes  
Target vectors can be displayed relative to own ship's heading (Relative) or north (True).  
Ground stabilization and Sea Stabilization  
Target vectors can be ground stabilized or sea stabilized. Sea stabilization is a mode where  
own ship and all targets are referenced to the sea using gyro heading and single axis log water  
speed inputs in True Motion mode. Ground stabilization is a mode where own ship and all  
targets are referenced to the ground using the ground track or set and drift inputs. If the  
accuracy seems unsatisfactory, enter the set and drift correction (section 2.12).  
True vector  
Vector mode, True or Relative, is selected with the VECTOR key. With true vectors the radar  
display will look like the one shown below.  
In the true motion mode, all fixed targets such as land, navigational marks and ships at anchor  
remain stationary on the radar screen with vector length zero. But in the presence of wind  
and/or current, vectors appear on fixed targets representing the reciprocal of set and drift  
affecting own ship unless set and drift values are properly entered.  
-2.15-  
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A
A
Buoy  
Buoy  
Target on colli-  
sion course  
Target on collision course  
Own ship  
Own ship  
B
B
(a) True vectors in head-up mode  
(b) Relative vectors in head-up mode  
Relative vector  
With relative vectors the radar display will look like (b).  
Relative vectors on targets which are not moving over the ground such as land, navigational  
marks and ships at anchor will represent the reciprocal of own ship’s ground track. A target of  
which vector extension passes through own ship is on the collision course. (Dotted lines in the  
figure are for explanation only.)  
Vector time  
Vector time (or the length of vectors) can be set to 30 seconds, 1, 2, 3, 6, 12, 15 or 30 minutes  
and the selected vector time is indicated at the upper-right corner of the screen.  
1. Press the PLOT MENU key to display the ARPA 1 menu.  
2. Press the [1] key to select the VECTOR TIME option.  
3. Further press the [1] key to select (or highlight) a desired vector time.  
4. Press the ENTER key to conclude your selection.  
5. Press the PLOT MENU key to close the menu.  
The vector tip shows an estimated position of the target after the selected vector time elapses.  
It can be valuable to extend the vector length to evaluate the risk of collision with any target.  
R/N/W version: ARPA vector time can be programmed onto the function key. (e.g. pressing  
the function key can change the vector time.)  
2.11 Past Position Display  
The ARPA displays equally time-spaced dots marking the past positions of any targets being  
tracked.  
A new dot is added every minute (or at preset time intervals) until the preset number is reached.  
If a target changes its speed, the spacing will be uneven. If it changes the course, its plotted  
course will not be a straight line.  
-2.16-  
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Displaying and erasing past positions  
To display past positions;  
1. Press the [PLOT MENU] and [0] key to display the ARPA 2 menu.  
[ARPA 2]  
1 [ARPA 1]  
2 TRIAL MODE  
3 HISTORY  
STATIC/DYNAMIC  
OFF/1/2  
4 HISTORY POINTS  
5 HISTORY INTVL  
6 MARK SIZE  
5/10/20  
30S/1/2/3/6MIN  
STD/LARGE  
7 GUARD, ACQUISITION STABILIZE NORTH/CRT  
8 INPUT SIG CHECK  
9 ARPA TRACK TEST  
0 ARPA INITIAL SETTING  
2. Press [3] key twice to select HISTORY ON.  
3. Press the ENTER key followed by the PLOT MENU key.  
The label HISTORY appears at the upper-right corner of the screen.  
To erase past positions; press the [3] key twice on the ARPA 2 menu.  
Selecting the number of dots and past position plot intervals  
1. Press the PLOT MENU and [0] key to show the ARPA 2 menu.  
2. Press the [4] key to select menu item HISTORY POINTS.  
3. Further press the [4] key to select a desired number of past positions (5, 10 or 20). The  
IMO-type has the selection of only 5 or 10.  
4. Press the ENTER key to confirm your selection.  
5. Press the [5] key to select menu item HISTORY INTERVAL.  
6. Further press the [5] key to select a desired past position plot interval (0.5, 1, 2, 3 or 6  
minutes).  
7. Press the ENTER key to conclude your selection.  
8. Press the PLOT MENU key to close the menu.  
2.12 Set and Drift (Set and Rate)  
Set, the direction in which a water current flows, can be manually entered in 0.1-degree steps.  
Drift, in another word Rate, the speed of tide, can also be entered manually in 0.1 knot steps.  
-2.17-  
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Set and drift corrections are beneficial for increasing the accuracy of vectors and target data.  
The correction is best made in the head-up mode with true vectors, watching landmasses, or  
other stationary targets. Thus, the speed and course of own ship over the ground are  
reciprocally calculated and compared with the relative bearing and range to the reference  
target to produce a Set and Drift. These values are automatically applied to all targets. If  
stationary targets have vectors, set and drift values should be adjusted until they lose vectors.  
Proceed as follows to enter set and drift (rate):  
1. Press the RADAR MENU key to show the FUNCTIONS 1 menu.  
2. Press the [0] key to show the FUNCTIONS 2 menu.  
3. Press the [7] key to select menu item SET, DRIFT.  
4. Further press the [7] key to select OFF or MAN option.  
OFF: No correction against set and drift.  
MAN: Manual entry of set and drift data.  
5. If OFF is selected, press the ENTER key.  
6. If you have selected MAN in step 4 above, the highlight cursor will advance to right  
requesting you to enter SET xxx.x°. Enter the value of set in degrees by hitting numeric  
keys without omitting leading zeroes, if any, and press the ENTER key.  
The highlight cursor will then advance to the next line DRIFT xx.xKT. Enter the value of  
drift in knots by hitting numeric keys without omitting leading zeroes, if any, and press the  
ENTER key. Set and drift have the same effect on own ship and all targets.  
7. Press the RADAR MENU key to close the menu. The label LOG (or NAV) on the top of  
the display changes to SMG xx.x KTBT, where SMG stands for Speed Made Good and BT,  
Bottom Track. Set and drift data can also be used in the basic radar without ARPA  
function.  
2.13 Setting CPA/TCPA Alarm Ranges  
The ARPA continuously monitors the predicted range at the Closest Point of Approach (CPA)  
and predicted time to CPA (TCPA) of each tracked target to own ship.  
When the predicted CPA of any target becomes smaller than a preset CPA alarm range and its  
predicted TCPA less than a preset TCPA alarm limit, the ARPA releases an aural alarm and  
displays the warning label COLLISION on the screen. In addition, the ARPA symbol changes  
to a triangle and flashes together with its vector.  
Provided that this feature is used correctly, it will help prevent the risk of collision by alerting  
you to threatening targets. It is important that GAIN, A/C SEA, A/C RAIN and other radar  
controls are properly adjusted.  
CPA/TCPA alarm ranges must be set up properly taking into consideration the size, tonnage,  
speed, turning performance and other characteristics of own ship.  
-2.18-  
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CAUTION  
CPA/TCPA Alarm  
The CPA and TCPA alarm feature should never be relied upon as the sole means for  
detecting the risk of collision.  
The navigator is not relieved of the responsibility to keep visual lookout for avoiding collisions,  
whether or not the radar or other plotting aid is in use.  
To set the CPA/TCPA alarm ranges:  
1. Press the PLOT MENU key to show the ARPA 1 menu.  
2. Press the [8] key to select menu item COLLISION ALARM. At this point, a highlight  
cursor appears at the "CPA x.x NM" field.  
3. Enter the CPA alarm range in nautical miles (0.0 to 9.9 nm) without omitting leading  
zeroes, if any, and press the ENTER key. The highlight cursor now moves to the "TCPA  
xx.x MIN" field.  
4. Enter the TCPA alarm limit in minutes (1.0 to 99.9 min) without omitting leading zeroes, if  
any, and press the ENTER key.  
5. Press the PLOT MENU key to close the menu.  
Acknowledging CPA/TCPA audible alarm  
Press the AUDIO OFF key to acknowledge and silence the CPA/TCPA aural alarm.  
The warning label COLLISION and the flashing of the triangle plot symbol and vector remain  
on the screen until the dangerous situation is gone or you intentionally terminate tracking of  
the target by using the CANCEL key.  
2.14 Setting a Guard Zone  
When a target transits the operator-set guard zone, the buzzer sounds and the indication  
GUARD turns red at the screen bottom. The target causing the warning is clearly indicated  
with an inverted flashing triangle.  
-2.19-  
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CAUTION  
Guard zone (GZ)  
The Guard Zone Alarm feature should never be relied upon as  
a sole means for detecting the risk of collision.  
The navigator is not relieved of the responsibility to keep visual  
lookout for avoiding collisions, whether or not the radar or other  
plotting aid is in use.  
Activating the guard zone  
One or two guard zones may be selected. The NO. 1 guard zone is available between 3 and 6  
nm and NO. 2 guard zone can be set anywhere when the NO. 1 zone is already in use.  
To set and activate the guard zone:  
1. Press the PLOT MENU key to show the ARPA 1 menu.  
2. Press the [4] key to select menu item GUARD ZONE.  
3. Further press the [4] key to select (or highlight) ON to activate the guard zone.  
4. Press the ENTER key to conclude your selection.  
5. Press the [5] key to select menu item GUARD ZONE SET. At this point the GUARD  
ZONE SET menu is displayed at the screen bottom.  
[GUARD ZONE SET]  
1 [ARPA 1]  
2 1/2  
SET LEFT/RIGHT BOUNDARY  
CANCEL PREVIOUS AREA: CANCEL KEY  
6. Press the [2] key and ENTER key. ([2] [2] [ENTER] when setting the No. 2 zone.)  
7. Referring to figure below, place the cursor at the outer left corner of the area (point A) and  
press the ENTER key.  
8. Place the cursor at the right edge of the area (point B) and press the ENTER key.  
Note: If you wish to create a guard zone having a 360-degree coverage around own ship,  
set point B in almost the same direction (approx. ±3°) as point A and press the ENTER  
key.  
If the range scale is changed to less than half of GZ, the label GZ OUT appears in red at the  
upper right corner of the screen.  
-2.20-  
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9. Press the [1] key followed by the PLOT MENU key to close the ARPA 1 menu.  
The guard zone like an example below appears on the display. Note that the guard zone has a  
fixed radial extension (width) of 0.5 nm. The label GZ is displayed in the box at the  
upper-right on the screen when guard zone is enabled.  
A
0.5nm  
NO. 1 Guard Zone (GZ) is available between 3 and 6 nm with a fixed  
range depth of 0.5 nm. NO. 2 GZ may be set anywhere when the NO.  
1 GZ is valid.  
B
Target in a guard zone is  
marked by inverted flashing  
triangle whichever is heading.  
Two more alarm zones (NO. 1 and NO. 2 Target Alarm Zones = TAZ)  
may be added in addition. This means a maximum 4 alarm zones are  
available at a time. ARPA symbols are not changed to inverted  
triangles in the TAZ, only those in GZ do so.  
Deactivating the guard zone  
1. Press the PLOT MENU key to show the ARPA 1 menu.  
2. Press the [4] key to select menu item GUARD ZONE.  
3. Further press the [4] key to select (or highlight) OFF to deactivate the guard zone.  
4. Press the ENTER key to conclude your selection followed by the PLOT MENU key to  
close the menu.  
To acknowledge the guard zone alarm  
Press the AUDIO OFF key to acknowledge and silence the guard zone aural alarm.  
2.15 Operational Warnings  
There are six main situations which cause the ARPA to trigger visual and aural alarms:  
• CPA/TCPA alarm  
• Guard zone alarm  
• Lost target alarm  
• Target full alarm for manual acquisition  
• Target full alarm for automatic acquisition  
• System failures  
CPA/TCPA alarm  
Visual and aural alarms are generated when the predicted CPA and TCPA of any target  
become less than their preset limits. Press the AUDIO OFF key to acknowledge and silence  
the CPA/TCPA aural alarm.  
-2.21-  
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Guard zone alarm  
Visual and aural alarms are generated when a target transits the operator-set guard zone. Press  
the AUDIO OFF key to acknowledge and silence the guard zone aural alarm. (Refer to  
paragraph 2.14 Setting a Guard Zone for further information.)  
Lost target alarm  
When the system detects a loss of a tracked target, the target symbol becomes a flashing  
diamond ( ) and the label "LOST" appears at the screen bottom. At the same time, an aural  
alarm is produced for one second.  
Press the LOST TARGET key to acknowledge the lost target alarm. Then, the lost target mark  
disappears.  
Target full alarm  
When the memory becomes full, the memory full status is indicated and the relevant  
indication appears on the screen and a short beep sounds.  
Manually acquired targets  
The indication "MAN TARGET FULL" appears at the screen bottom and a short beep tone  
sounds when the number of manually acquired targets reaches 20 or 40 depending on whether  
auto acquisition is activated or not.  
Automatically acquired targets  
The indication "AUTO TARGET FULL" appears at the screen bottom and a short beep tone  
sounds when the number of automatically acquired targets reaches 20.  
System failure alarm  
When the ARP board receives no signal input from the radar or external equipment, the screen  
shows both "SYSTEM FAIL" associated with an indication denoting offending equipment,  
also releasing an aural alarm. The missing signals are denoted as shown below:  
Missing Signal  
Indication  
LOG  
* Speed log signal  
* Heading signal, Gyrocompass  
Trigger signal from radar  
Video from radar  
GYRO  
TRIGGER  
VIDEO  
* Bearing signal from radar antenna AZIMUTH  
* Heading pulses from radar antenna HEADLINE  
* The alarm is available with or without ARPA.  
-2.22-  
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2.16 Trial Maneuver  
Trial simulates the effect on all tracked targets against own ship's maneuver without  
interrupting the updating of target information.  
There are two types of trial maneuvers: static and dynamic.  
Dynamic trial maneuver  
A dynamic trial maneuver displays predicted positions of the tracked targets and own ship.  
You enter own ship's intended speed and course with a certain "delay time." Assuming that all  
tracked targets maintain their present speeds and courses, the targets' and own ship's future  
movements are simulated in one-second increments indicating their predicted positions in  
one-minute intervals as illustrated below.  
The delay time represents the time lag from the present time to the time when own ship will  
actually start to change her speed and/or course. You should therefore take into consideration  
own ship's maneuvering characteristics such as rudder delay, turning delay and acceleration  
delay. This is particularly important on large vessels. How much the delay is set the situation  
starts immediately and ends in a minute.  
In the example shown below, own ship will advance straight ahead (even after a maneuver)  
for a delay time of 5 minutes and then alters speed and course until operator-specified  
intended speed and course are achieved (position OS7 in this example).  
B8  
B7  
B6  
B5  
B4  
B3  
B2  
OS8  
OS7  
OS6  
OS5  
B1  
B0  
A8  
A7  
B
OS4  
OS3  
A6  
A5  
Delay time = 5 min.  
OS2  
OS1  
OS0  
A4  
A3  
Present own  
ship position  
A2  
A1  
A0  
A
T
Dynamic trial maneuver  
Note that once a dynamic trial maneuver is initiated, you cannot alter own ship's trial speed,  
course or delay time until the trial maneuver is terminated.  
-2.23-  
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Static trial maneuver  
A static trial maneuver displays only the final situation of the simulation. If you enter the same  
trial speed, course and delay time under the same situation as in the aforementioned example  
of dynamic trial maneuver, the screen will instantly show position OS7 for own ship, position  
A7 for target A and position B7 for target B, omitting the intermediate positions. Thus, the  
static trial maneuver will be convenient when you wish to know the maneuver result  
immediately.  
Note: For accurate simulation of ship movements in a trial maneuver, own ship's  
characteristics such as acceleration and turning performance should be properly set in initial  
settings at the time of installation.  
To perform a trial maneuver:  
1. Press the PLOT MENU key followed by the [0] key to show the ARPA 2 menu.  
[ARPA 2]  
1 [ARPA 1]  
2 TRIAL MODE  
3 HISTORY  
STATIC/DYNAMIC  
OFF/1/2  
4 HISTORY POINTS  
5 HISTORY INTVL  
6 MARK SIZE  
5/10/20  
30S/1/2/3/6MIN  
STD/LARGE  
7 GUARD, ACQUISITION STABILIZE NORTH/CRT  
8 INPUT SIG CHECK  
9 ARPA TRACK TEST  
0 ARPA INITIAL SETTING  
2. Press the [2] key to select TRIAL MODE.  
3. Further press the [2] key to select (or highlight) STATIC or DYNAMIC trial maneuver  
option as appropriate.  
4. Press the ENTER key to conclude your selection followed by the [1] key to go back to the  
ARPA menu.  
5. Press the VECTOR key to select true or relative vector.  
6. Press the [9] key on the ARPA 1 menu. The TRIAL DATA SETTING menu appears at the  
screen bottom associated with the current own ship's speed and course readouts.  
TRIAL DATA SETTING  
[DYNAMIC MODE]:  
SPEED (VRM)  
COURSE (EBL)  
DELAY TIME  
15.0KT  
53.6°  
xx.xMIN  
TRIAL MANEUVER START? (YES/NO)  
TRIAL MANEUVER END? (YES/NO)  
TRAIL MANEUVER RESTART? (YES/NO)  
TRAIL MANEUVER END? (YES/NO)  
Note: The second line reads [STATIC MODE] in the event of a static trial maneuver.  
-2.24-  
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7. Enter own ship's intended speed, course and delay time in the following manner:  
Speed:  
Course:  
Set with the VRM control.  
Set with the EBL control.  
Delay time: Enter in minutes by hitting numeral keys. This is the time after which own ship  
takes a new situation, not the time the simulation begins. Change the delay  
time according to own ship loading condition, etc.  
8. Press the [9] key again on the ARPA 1 menu to start a trial maneuver. During trial  
maneuver, REL/TRUE vector can be selected.  
9. Press the PLOT MENU to close the menu.  
Trial maneuver takes place in three minutes with the letter "T" displayed at the bottom of the  
screen. If any tracked target is predicted to be on a collision course with own ship (that is, the  
target ship comes within preset CPA/TCPA limits), the target plot symbol changes to a triangle  
() and flashes. If this happens, change own ship's trial speed, course or delay time to obtain a  
safe maneuver. The trial maneuver is automatically terminated and the normal radar picture is  
restored three minutes later.  
R/N/W versions: Target data in the trail maneuver mode is affected by the trail data.  
"CAUTION! TARGET DATA IS THE RESULT OF TRIAL" is displayed. (Target data is not  
affected on G version.)  
Terminating trial maneuver  
Press the PLOT MENU key and the [9] key at any time.  
2.17 ARPA Performance Test  
Test program is provided for assessing the ARPA overall performance. Note that normal  
operation is interrupted and the label "XX" is displayed at the bottom of the screen during this  
test. The test may be terminated at any moment.  
To execute the performance test:  
1. Select the north-up presentation mode on the 12 nm range.  
2. Enter own ship speed of 0 knots.  
3. Press the PLOT MENU key followed by the [0] key to show the ARPA 2 menu.  
4. Press the [9] key to select ARP TRACK TEST. The display is cleared and a performance  
test picture comes on.  
5. Press the ENTER key.  
An alert XX flickers during the test. It takes approximately 3 minutes for all vectors to be  
displayed. The test does not need echo signals, gyro nor speed log input. 7 targets having  
different speeds and courses, as shown in the table below, are simulated automatically.  
6. The test continues for 5 minutes and then repeats.  
To terminate the track test, press the STBY/TX key twice and the STBY display will appear.  
Select any target with the cursor and check that the selected target shows the course and speed  
as in the table. CPA and TCPA shown below are initial values which change with time.  
-2.25-  
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000  
350  
010  
020  
340  
Target  
Course  
Speed  
(kt)  
CPA  
(nm)  
TCPA  
(min)  
330  
030  
E
F
320  
040  
310  
300  
290  
280  
050  
060  
070  
080  
Target A  
Target B  
Target C  
Target D  
Target E  
Target F  
Target G  
90.0°T  
0.0°T  
10.0  
0.0  
1.0  
4.0  
1.7  
0.9  
6.0  
0.0  
4.0  
10.4  
-
C
A
D
090  
100  
270  
260  
180.0°T  
216.5°T  
273.5°T  
180.0°T  
24.6°T  
10.0  
23.8  
14.2  
20.0  
15.6  
28.2  
15.0  
22.5  
30.0  
43.6  
B
250  
240  
110  
120  
130  
230  
XX  
140  
220  
G
210  
150  
200  
160  
190  
170  
180  
Note: Note that target numbers are subject to change. If test results show any deviation from  
the above, consult with your service representative.  
2.18 Criteria for Selecting Targets for Tracking  
The FURUNO ARPA video processor detects targets in midst of noise and discriminates radar  
echoes on the basis of their size. Target whose echo measurements are greater than those of  
the largest ship in range or tangential extent are usually land and are displayed only as normal  
radar video. All smaller ship-sized echoes which are less than this dimension are further  
analyzed and regarded as ships and displayed as small circles superimposed over the video  
echo.  
When a target is first displayed, it is shown as having zero true speed but develops a course  
vector as more information is collected. In accordance with the International Marine  
Organization Automatic Radar Plotting Aid (IMO ARPA) requirements, an indication of the  
motion trend should be available within 20 scans of antenna and full vector accuracy within  
60 scans. The FURUNO ARPAs comply with these requirements.  
Acquisition and tracking  
A target which is hit by 5 consecutive radar pulses is detected as a radar echo. Manual  
acquisition is done by designating a detected echo with the trackball. Automatic acquisition is  
done in the acquisition areas when a target is detected 5-7 times continuously depending upon  
the congestion. Tracking is achieved when the target is clearly distinguishable on the display  
for 5 out of 10 consecutive scans whether acquired automatically or manually. Required  
tracking facilities are available within 0.1-32 nm on range scales including 3, 6, 12 nm, full  
plotting information is available within one scan when the range scale has been changed.  
Targets not detected in 5 consecutive scans become "lost targets."  
Quantization  
The entire picture is converted to a digital from called "Quantified Video." A sweep range is  
divided into small segments and each range element is "1" if there is radar echo return above a  
threshold level, or "0" if there is no return.  
-2.26-  
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The digital radar signal is then analyzed by a ship-sized echo discriminator. As the antenna  
scans, if there are 5 consecutive radar pulses with 1’s indicating an echo presence at the exact  
same range, a target "start" is initiated. Since receiver noise is random, it is not three bang  
correlated, and it is filtered out and not classified as an echo.  
The same is true of radar interference. Electronic circuits track both the closet and most distant  
edges of the echo. At the end of the scanning of the echo, the discriminator indicates the  
measured maximum range extent and total angular extent subtended by the echo. If the echo is  
larger than a ship-sized echo in range extent and/or angular width, adjusted as a function of  
range, it is declared to be a coastline and the closet edge is put into memory as a map of the  
area. This land outline is used to inhibit further acquisition and tracking of ship sized echoes  
beyond the closest coast outline. 5 consecutive scans of coastal outline are retained in memory  
to allow for signal variation. All smaller echoes are declared to be ship sized and the middle of  
the leading edge is used to provide precise range and bearing coordinates of each echo on  
every scan. This range/bearing data is matched to previous data and analyzed from  
scan-to-scan for consistency. When it is determined to be as consistent as a real target,  
automatic acquisition occurs and tracking is initiated. Continued tracking and subsequent  
calculation develop the relative course and speed of the target just as a man would do when  
plotting the relative course and speed of the target on the scope with a grease pencil.  
The true course and speed of own ship are computed from own ship's gyro and speed inputs,  
and the resulting course and speed of each tracked target is easily computed by vector  
summing of the relative motion with own ship’s course and speed. The resulting true or  
relative vector is displayed for each of the tracked targets. This process is updated continually  
for each target on every scan of the radar.  
Automatic acquisition areas and suppression lines  
Performance of auto-acquisition is enhanced by controlling the limit lines (suppression line) in  
the former series of FURUNO ARPAs. In this new series of ARPAs, the automatic  
acquisition rings are used instead of the limit lines.  
Auto acquisition rings work as suppression lines when viewed from the opposite direction.  
They should be placed clear of a landmass or shoreline. The acquisition areas may be a full  
360 degree circle or sector of any angles are gyro stabilize.  
Qualitative description of tracking error  
The FURUNO ARPA accuracy complies with or exceed IMO standards.  
Own ship maneuvers  
For slow turns there is no effect. For very high turning rates (greater than 150°/ minute,  
depending on gyro), there is some influence on all tracked targets which last for a minute or  
two and then all tracked targets revert to full accuracy.  
Other ship maneuvers  
Target ship courses, lag 15 to 30 seconds at high relative speed, or 3 to 6 seconds at low (near  
0) relative speed. It is less accurate during a turn due to lag, but accuracy recovers quickly.  
-2.27-  
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2.19 Factors Affecting ARPA Functions  
Sea returns  
If the radar anti-clutter control is adjusted properly, there is no serious effect because distant  
wave clutter, not eliminated by this control, is filtered out by more than one bang correlation  
and scan-to-scan matching of data.  
Rain and snow  
Clutter can be acquired and tracked as targets. Adjust the A/C RAIN control. If it is heavy rain,  
switch to S-band if provided, or switch on the interference rejector on the radar. If heavy  
clutter still exists, switch to manual acquisition. Accuracy can be affected.  
Low clouds  
Usually no effect. If necessary, adjust the A/C RAIN control.  
Non-synchronous emissions  
No effect.  
Low gain  
Insufficient or low radar receiver gain will result in some targets not being acquired at long  
distance. ARPA display will be missing on one or more targets that could only be visible if the  
radar sensitivity control (GAIN control) were increased.  
The setting of the correct radar receiver gain is not critical but the target should be on the radar  
PPI and be clearly visible and well defined.  
Manual acquisition is done if a target is positively displayed more than once. Automatic  
acquisition is done when the target is detected 5-7 times continuously. Tracking is achieved  
when the target is detected 5 times (not necessarily continuously) out of 10 scans. If not  
detected 6 times out of 10 scans, the target will become a "lost target." The ARPA will acquire  
a radar echo that is present once in every six antenna scans and continue tracking if 1 in 10.  
Second trace echoes  
When the radar beam is super refracted, strong echoes may be received at such long ranges  
that they appear on a different timebase sweep than the transmitted pulse. This gives an  
incorrect range indication. Second and third trace echoes can be tracked if they are consistent  
enough to meet acquisition and tracking criteria but target course and speed data will be in  
error.  
-2.28-  
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Blind and shadow sectors  
Radar shadow or blind areas caused by obstructions aboard ship, for example, funnels and  
masts, in the path of the radar beam can result in reduction of radar beam intensity in that  
particular direction. This may eliminate the detection of some targets. The ARPA system will  
lose track of targets shortly after they are lost on the radar picture and if they remain in a blind  
zone. These targets will however be acquired and tracked when they pass out of the blind zone  
and again present normal radar echo. The angular width and bearing of any shadow sector  
should be determined for their influence on the radar. In certain cases false echoes in the  
shadow sector cause the ARPA system to acquire, track, and vector them. Shadow sectors  
should be avoided.  
Indirect echoes  
A target at close range is usually picked up directly, but it can also be received as reflection  
from a large, flat surface. This will result in the radar presenting two or more echoes on the  
display, each at a different range. The ARPA can acquire and track the false echo if it is  
detected by five consecutive scans. Reduction in radar GAIN can eliminate the multiple  
echoing but care should be taken as range detection also will be reduced.  
Radar interference  
If interference is extreme due to another radar operating at close range, spiral "dotting" and/or  
false targets may appear momentarily. The interference rejector can clear the display.  
To receive radar beacon or SART signals, turn off the radar interference rejection and echo  
average which operate on the correlation technique.  
-2.29-  
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Chapter 3 RADAR OBSERVATION  
3.1 General  
Minimum and maximum ranges  
Minimum range  
The minimum range is defined by the shortest distance at which, using a scale of 1.5 or 0.75  
nm, a target having an echoing area of 10 m2 is still shown separate from the point  
representing the antenna position.  
It is mainly dependent on the pulselength, antenna height, and signal processing such as main  
bang suppression and digital quantization. It is a good practice to use a shorter range scale as  
far as it gives favorable definition or clarity of picture. The IMO Resolution MSC.64(67)  
Annex 4 (Shipborne radar) and A.820: 1995 (High Speed Craft Radar) require the minimum  
range to be less than 50 m and 35 m, respectively. This series of radars satisfy this  
requirement.  
Maximum range  
The maximum detecting range of the radar, Rmax, varies considerably depending on several  
factors such as the height of the antenna above the waterline, the height of the target above the  
sea, the size, shape and material of the target, and the atmospheric conditions.  
Under normal atmospheric conditions, the maximum range is equal to the radar horizon or a  
little shorter. The radar horizon is longer than the optical one by about 6% because of the  
diffraction property of the radar signal. The Rmax is given in the following equation.  
R
ma
x
= 2.2 x ( h1 + h2 )  
where Rmax:  
radar horizon (nautical miles)  
antenna height (m)  
h1:  
h2 :  
target height (m)  
Radar horizon  
Optical horizon  
For example, if the height of the antenna above the waterline is 9 meters and the height of the  
target is 16 meters, the maximum radar range is;  
Rmax= 2.2 x ( 9 + 16 ) = 2.2 x (3 + 4) = 15.4 nm  
It should be noted that the detection range is reduced by precipitation (which absorbs the radar  
signal).  
-3.1-  
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X-band and S-band  
In fair weather, the above equation does not give a significant difference between X- and  
S-band radars. However, in heavy precipitation condition, an S-band radar would have better  
detection than an X-band radar.  
Radar resolution  
There are two important factors in radar resolution (discrimination): bearing resolution and  
range resolution.  
Bearing resolution  
Bearing resolution is the ability of the radar to display as separate pips the echoes received  
from two targets which are at the same range and close together. It is proportional to the  
antenna length and reciprocally proportional to the wavelength. The length of the antenna  
radiator should be chosen for a bearing resolution better than 2.5° (IMO Resolution). This  
condition is normally satisfied with a radiator of 1.2 m (4 ft) or longer in the X-band. The  
S-band radar requires a radiator of about 12 feet (3.6 m) or longer.  
Range resolution  
Range resolution is the ability to display as separate pips the echoes received from two targets  
which are on the same bearing and close to each other. This is determined by pulselength only.  
Practically, a 0.08 microsecond pulse offers the discrimination better than 35 m as do so with  
all FURUNO radars.  
Test targets for determining the range and bearing resolution are radar reflectors having an  
echoing area of 10 m2.  
Bearing accuracy  
One of the most important features of the radar is how accurately the bearing of a target can be  
measured. The accuracy of bearing measurement basically depends on the narrowness of the  
radar beam. However, the bearing is usually taken relative to the ship’s heading, and thus,  
proper adjustment of the heading marker at installation is an important factor in ensuring  
bearing accuracy. To minimize error when measuring the bearing of a target, put the target  
echo at the extreme position on the screen by selecting a suitable range.  
Range measurement  
Measurement of the range to a target is also a very important function of the radar. Generally,  
there are two means of measuring range: the fixed range rings and the variable range marker  
(VRM). The fixed range rings appear on the screen with a predetermined interval and provide  
a rough estimate of the range to a target. The variable range marker’s diameter is increased or  
decreased so that the marker touches the inner edge of the target, allowing the operator to  
obtain more accurate range measurements.  
-3.2-  
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3.2 False Echoes  
Occasionally echo signals appear on the screen at positions where there is no target or  
disappear even if there are targets. They are, however, recognized if you understand the reason  
why they are displayed. Typical false echoes are shown below.  
Multiple echoes  
Multiple echoes occur when a transmitted pulse returns from a solid object like a large ship,  
bridge, or breakwater. A second, a third or more echoes may be observed on the display at  
double, triple or other multiples of the actual range of the target as shown below. Multiple  
reflection echoes can be reduced and often removed by decreasing the gain (sensitivity) or  
properly adjusting the A/C SEA control.  
Sidelobe echoes  
Every time the radar pulse is transmitted, some radiation escapes on each side of the beam,  
called "sidelobes." If a target exists where it can be detected by the side lobes as well as the  
main lobe, the side echoes may be represented on both sides of the true echo at the same range.  
Side lobes show usually only on short ranges and from strong targets. They can be reduced  
through careful reduction of the gain or proper adjustment of the A/C SEA control.  
Virtual image  
A relatively large target close to your ship may be represented at two positions on the screen.  
One of them is the true echo directly reflected by the target and the other is a false echo which  
is caused by the mirror effect of a large object on or close to your ship as shown in the figure  
below. If your ship comes close to a large metal bridge, for example, such a false echo may  
temporarily be seen on the screen.  
Target ship  
Own  
ship  
Radar  
antenna  
True  
echo  
Radar  
mast  
Mirror image  
of target ship  
False  
echo  
Blind zone  
Virtual image by mirror effect  
Blind zone by stern block  
-3.3-  
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Shadow sectors (see above right)  
Funnels, stacks, masts, or derricks in the path of the antenna block the radar beam. If the angle  
subtended at the scanner is more than a few degrees, a non-detecting sector may be produced.  
Within this sector targets can not be detected.  
3.3 SART (Search and Rescue Transponder)  
A Search and Rescue Transponder (SART) may be triggered by any X-Band (3 cm) radar  
within a range of approximately 8 nm. Each radar pulse received causes it to transmit a  
response which is swept repetitively across the complete radar frequency band. When  
interrogated, it first sweeps rapidly (0.4 µs) through the band before beginning a relatively  
slow sweep (7.5 µs) through the band back to the starting frequency. This process is repeated  
for a total of twelve complete cycles. At some point in each sweep, the SART frequency will  
match that of the interrogating radar and be within the pass band of the radar receiver. If the  
SART is within range, the frequency match during each of the 12 slow sweeps will produce a  
response on the radar display, thus a line of 12 dots equally spaced by about 0.64 nautical  
miles will be shown.  
When the radar to the SART is reduced to about 1 nm, the radar display my show also the 12  
responses generated during the fast sweeps. These additional dot responses, which also are  
equally spaced by 0.64 nautical miles, will be interspersed with the original line of 12 dots.  
They will appear slightly weaker and smaller than the original dots.  
Screen A:When SART  
Screen B:When SART  
is distant  
is close  
Lines of 12 dots  
are displayed in  
concentric arcs.  
Echo of SART  
24 NM  
Radar antenna  
beamwidth  
Echo of  
SART  
1.5 NM  
Position of  
SART  
Own ship's  
position  
Own ship's  
position  
Position of  
SART  
SART mark  
length  
Radar receiver  
bandwidth  
9500 MHz  
9200 MHz  
Sweep time  
7.5 µs  
95 µs  
Low speed sweep signal  
High speed sweep signal  
Sweep start  
Showing SART marks on the radar display  
To show the SART marks only on the radar display, detune the radar receiver by turning the  
TUNE control out of best tuning condition. This erases or weakens all normal radar echoes,  
but, the SART marks are not erased because the SART response signal scans over all  
frequencies in the 9 GHz band. When the radar approaches the SART in operation, the SART  
marks will enlarge to large arcs, blurring a large part of the screen. Reduce the sensitivity and  
adjust the sea clutter control of the radar.  
-3.4-  
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Summary to detect SART response  
1. Use range scale of 6 or 12 nm as the spacing between the SART responses is about 0.6 nm  
(1125 m) to distinguish the SART.  
2. Turn off the automatic clutter suppression.  
3. Turn off the Interference Rejector.  
4. Turn off the Echo Average.  
General remarks on receiving SART  
Radar range scale  
When looking for a SART it is preferable to use either the 6 or 12 nautical mile range scale.  
This is because the total displayed length of the SART response of 12 (or 24) dots may extend  
approximately 9.5 nautical miles beyond the position of the SART and it is necessary to see a  
number of response dots to distinguish the SART from other responses.  
SART range errors  
When responses from only the 12 low frequency sweeps are visible (when the SART is at a  
range greater than about 1 nm), the position at which the first dot is displayed may be as mush  
as 0.64 nm beyond the true position of the SART. When the range closes so that the fast  
sweep responses are seen also, the first of these will be no more than 150 meters beyond the  
true position.  
Radar bandwidth  
This is normally matched to the radar pulselength and is usually switched with the range scale  
and the associated pulselength. Narrow bandwidths of 3-5 MHz are used with long pulses on  
long range scales and wide bandwidths of 10-25 MHz with short pulses on short ranges.  
A radar bandwidth of less than 5 MHz will attenuate the SART signal slightly, so it is  
preferable to use a medium bandwidth to ensure optimum detection of the SART.  
Radar side lobes  
As the SART is approached, side lobes from the radar antenna may show the SART responses  
as a series of arcs or concentric rings. These can be removed by the use of the anti-clutter sea  
control although it may be operationally useful to observe the side lobes as they may be easier  
to detect in clutter conditions and also they will confirm that the SART is near to own ship.  
-3.5-  
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Detuning the radar  
To increase the visibility of the SART in clutter conditions, the radar may be detuned to  
reduce the clutter without reducing the SART response. Radar with automatic frequency  
control may not permit manual detune of the equipment. Care should be taken in operating the  
radar in the detuned condition as other wanted navigational and anti-collision information may  
be removed. The tuning should be returned to normal operation as soon as possible.  
Gain  
For maximum range SART detection the normal gain setting for long range detection should  
be used, i. e., with a light background noise speckle visible.  
A/C SEA control  
For optimum range SART detection, this control should be set to the minimum. Care should  
be exercised as wanted targets in sea clutter may be obscured. Note also that in clutter  
conditions the first few dots of the SART response may not be detectable, irrespective of the  
setting of the anti-clutter sea control. In this case, the position of the SART may be estimated  
by measuring 9.5 nautical miles from the furthest dot back towards own ship.  
Some sets have automatic/manual anti-clutter sea control facilities in which case the operator  
is advised to use manual control initially until the SART has been detected. The effect of the  
auto sea control on the SART response can then be compared with manual control.  
A/C RAIN control  
This should be used normally (i.e. to break up areas of rain) when trying to detect a SART  
response which, being a series of dots, is not affected by the action of the anti-clutter rain  
circuitry. Note that Racon responses, which are often in the form of a long flash, will be  
affected by the use of this control.  
Some sets have automatic/manual anti-clutter rain control facilities in which case the operator  
is advised to use manual control initially until the SART has been detected. The effect of the  
auto sea control on the SART response can then be compared with manual control.  
This information is excerpted from IMO SN/Circ 197 OPERATION OF MARINE RADAR FOR SART  
DETECTION.  
000  
350  
010  
020  
340  
330  
030  
3.4 RACON (Radar beacon)  
320  
040  
A RACON is a radar beacon which emits radar receivable  
signals in the radar frequency spectrum (X or S band). There are  
several signal formats; in general, the Recon signal appears on  
the radar screen as a rectangular echo originating at a point just  
beyond the position of the radar beacon. It has a Morse coded  
pattern. Note that the position on the radar display is not  
accurate.  
310  
300  
290  
20  
050  
060  
070  
00  
090  
100  
110  
120  
130  
270  
260  
250  
240  
230  
140  
220  
210  
150  
200  
160  
190  
170  
10  
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CHAPTER 4 OPERATION OF VIDEO PLOTTER  
4.1 General  
The Video Plotter RP-26 is an optional circuit board which is accommodated in the display  
unit of the radar. It permits use of 2 memory cards, a memory card(RAM) for storing the  
operator created radar maps, and the other is a chart card(ROM) storing Furuno made digital  
charts.  
The memory card enables the operator to create radar maps more precisely than the standard  
supplied radar map card (150 points per map). 30 navigation lines may be stored and each line  
may contain up to 30 vertexes (waypoints). Five nav lines may be simultaneously shown on  
the display. 98 waypoints, numbered 1-98, may be stored. The card permanently retains the  
data you have entered from the radar display or by Lat/Long positions. Own ship and other  
ship tracks may be stored at a selected interval. To display Nav line, RTE and WPL sentences  
are necessary. WPL ID sentence received in figure only. The data can be copied for other  
ships of the same shipping company.  
Charts are superimposed on the radar picture without disturbing the radar observation. The  
chart area is dependent on the radar range in use.  
The drive for the ROM card can also drive the Electronic Reference Chart (ERC). The ERC is  
a digital chart published by the Japanese Hydrographic Bureau. Note it is not an ENC used for  
ECDIS.  
-4.1-  
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4.2 The Video Plotter Display  
Press the RADAR MENU. Press [9] once or twice for “Chart plus Radar” or “Radar”.  
North marker  
000  
010  
350  
020  
Separation zone  
340  
Heading marker  
330  
030  
320  
040  
Waypoint  
310  
050  
Navline  
Target being tracked  
W012  
060 Own ship safe contour  
300  
070  
290  
Heading line  
280  
080  
Planned route  
090  
270  
260  
100  
Own ship vector  
250  
110  
240  
120  
Approximate coastline  
W011  
230  
130  
140  
220  
Dangerous side of own  
Waypoint  
210  
ship safe contour may be  
marked like this (hatched  
line).  
150  
200  
160  
190  
170  
180  
Past position  
ARPA: Equally time-spaced positions of any targets being tracked.  
Note-not equally geographically spaced.  
EPA: Past plot positions may not be equally time-spaced, up to the  
operator.  
4.3 Display Modes  
The RP-26 has two motion displays and three presentation modes.  
Motion Displays:  
Relative Motion (RM),  
True Motion (TM)  
Presentation Modes: North-up (NU),  
Course-up (CU),  
Head-up (HU)  
Note: HU is not available on RADAR/VIDEO PLOTTER display.  
When own ship mark is at a distance from the screen center 3/4 the range in use it is  
automatically reset to a point of 75% radius.  
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Precaution for Chart/Memory Card  
Both the chart card and memory card are susceptible to sunlight and magnetic material.  
• Keep them away from direct sunlight, heat sources and active gases.  
• Keep cards away from water and chemicals.  
• Keep the connector free of foreign material.  
• Do not drop the cards.  
How to Display Charts  
To display a chart;  
1. Insert the chart RAM card in one of 2 slots.  
Eject button for upper  
card  
Drive for chart card  
Eject button for lower card  
Drive for chart card or RAM  
2. Press the RANGE to select the radar range. The chart appears. The following ranges are  
available:  
0.125, 0.25, 0.5, 0.75, 1.5, 3, 6, 12, 24, 48, 96 nm  
Chart Position Correction  
There may be a case where the radar picture does not match the chart overlay. This is due to an  
error in the position fixing system (GPS, Loran, etc.) or the different coordinates between the  
position fixing system and the radar. You can align chart with the radar image as follows:  
1. Press [CHART ALIGN] key. M. ALIGNING appears at the top of the screen.  
2. Rotate the trackball to shift the chart (or own ship) to the correct position.  
3. Press [CHART ALIGN] again. MAN ALIGNED appears.  
No track is displayed and memorized if the chart is aligned.  
Canceling chart correction  
1. Press [NAV MENU] and [0] to display the VIDEO PLOTTER 2 menu.  
2. Press [2] to select NAV DATA POSN.  
3. Press [ENTER] to cancel correction. Navaid position data is restored.  
The cursor position can be corrected on "ALIGN DATA" submenu in the VIDEO PLOTTER  
2 menu. The keying sequence is NAV MENU, 0, 3 (3 ALIGN +CURSOR DATA ON).  
+CURSOR POSN M> ALIGN appears at the bottom right of the screen.  
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4.4 Set- up of Video Plotter Display  
Hiding/Showing Graphics  
1. Press [NAV MENU] and [8] to display the PLOT DISPLAY SELECT menu. Current  
selections appear in reverse video.  
Blank items have been turned off on the INITIAL SETTING menu. For further details see  
4.11 Initial Settings.  
[PLOT DISP SELECT]  
1 [VIDEO PLOTTER 1]  
2 DANGER HIGHLIGHT OFF/ON  
3 COAST LINE  
4 LAND DENSITY  
5 PLACE NAME  
6 MARK  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
7 OWN SHIP PLOT  
8 TARGET PLOT  
9 CONTOUR LINE  
0 GRID  
OFF/SEPARATE/CONTINUE  
OFF/ON  
OFF/ON  
OFF/ON  
2. Press appropriate numeral key twice to hide or show graphic.  
3. Press [ENTER].  
4. Repeat steps 2 and 3 to hide or show other graphics.  
5. Press [NAV MENU] to close the menu.  
Note: LAND DENSITY fills (ON) or hollows (OFF) land on an electronic chart. Land will be  
hollow when wrong card or wrong scale is used regardless of LAND DENSITY setting.  
Hiding/Showing Nav Data  
You may select what navigation data to display on the video plotter display as follows:  
1. Press [NAV MENU] to display the NAV INFORMATION 1 menu.  
[NAV INFORMATION 1]  
1 [VIDEO PLOTTER 1]  
2 SELECT NAVAID  
3 OWN SHIP POSN  
4 POSN  
GPS+LC/DEAD RECKONING  
OFF L/L  
xx°xx.xxx N/S  
xx°xx.xxx E/S  
OFF/L/L  
5 +CURSOR DATA  
6 WPT DATA  
OFF/REL/TRUE  
7 [NAV LINE]  
8 [WAYPOINT]  
9 WIND DATA  
OFF/ON  
0 [NAV INFORMATION 2]  
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2. Press appropriate numeral key to select both item and option. Press [ENTER] to register  
selection.  
For "OWN SHIP POSN" (manual input of position), do the following;  
1) Press [4].  
2) Enter latitude in seven digits.  
3) Press [ENTER]. (If necessary to change to coordinate, press [4] and press [ENTER]).  
4) Enter longitude in eight digits.  
5) Press [ENTER]. (If necessary to change to coordinate, press [5] and press [ENTER]).  
3. Press [0] to go to next page, the NAV INFORMATION 2 menu. Select options as you did  
on the previous menu. To return to the previous menu, press [1].  
[NAV INFORMATION 2]  
1 [NAV INFORMATION 1]  
2 WIND GRAPH  
OFF/ON  
3 WIND UNIT  
m/s/KT  
4 CURRENT DATA  
5 CURRENT GRAPH  
6 DEPTH DATA  
OFF/ON  
OFF/ON  
OFF/ON  
7 DEPTH GRAPH  
8 [DEPTH SCALE  
9 DEPTH UNIT*  
OFF/ON  
10/20/50/100/200/500  
m/ft  
0 [NAV INFORMATION 3]  
*: Fishing mode only (one type of R-type)  
4. Press [0] to display the NAV INFORMATION 3 menu.  
[NAV INFORMATION 3]  
1 [NAV INFORMATION 2]  
2 WATER TEMPERATURE* OFF/ON  
3 DATE  
OFF/UTC/LOCAL  
±xx.xH  
4 USE WPL  
NAV LINE/WP  
5, 6: When the radar is a component of an INS.  
5
6
5. To set time indication, press [3] key several time to select OFF, UTC or LOCAL and press  
[ENTER].  
6. Press [NAV MENU] to close the menu.  
4.5 Track  
This section provides the information necessary for setting the track display conditions of both  
own ship and other vessels.  
Stopping Plotting of Own Ship's Track  
1. Press [NAV MENU] and [5] key in order.  
[OWN SHIP, TARGET PLOT]  
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1 [VIDEO PLOTTER 1]  
2 RECORD OWN SHIP PLOT OFF/ON  
3 OWN SHIP PLOT INTVL  
4 OWN SHIP PLOT COLOR  
RED/MAGENTA/YEL  
10/30SEC/1/2/3/6MIN  
*
GRN/CYAN/BLU  
OFF/ON  
10/30SEC/1/2/3/6MIN  
5 RECORD TARGET PLOT  
6 TARGET PLOT INTVL  
7
8 SMOOTHING  
OFF/1/2/3/6/7/8/9  
*: R-type only  
2. Press [2] twice to select OFF.  
3. Press [ENTER].  
Own ship's track is neither plotted or saved to the memory. To resume plotting, select ON at  
step 2 and press [ENTER].  
Stopping Plotting of Other Ship’s Track  
1. Press [NAV MENU] and [5] key in order.  
2. Press [2] twice to select OFF.  
3. Press [ENTER].  
Other ship's tracks are neither plotted or saved to the memory. To resume plotting, select ON  
at step 3 and press [ENTER].  
Track Plotting Interval  
The memory stores ship's position in latitude and longitude at a sampling rate set on the OWN  
SHIP, TARGET PLOT menu. The position data so stored is used to display past own ship's  
track on the screen.  
The plotting interval affects track reconstruction. A shorter interval provides more accurate  
reconstruction of track, however storage time of the track is reduced.  
1. Press [NAV MENU] and [5] in order.  
2. To change own ship's track plotting interval, press [3] several times to display desired  
plotting interval in reverse video.  
3. Press [ENTER].  
4. To change ship's track plotting interval, press [6] (several times) to select plotting interval.  
5. Press [ENTER].  
Plot interval and track storage time  
Memory capacity for own ship's track and other ship's track is 6,000 points each. For other  
ship's track the 6,000 points is divided equally among ten targets, so there are 600 points per  
target. When a track memory becomes full the oldest track is deleted to make room for a new  
entry.  
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If own ship track is stored every minute, 6,000 points of memory represents 100 hours of time  
span; 3 min intervals covers 16 days and 16 h. The time span covering one other ship is 1/10  
of own ship as a total of 10 other ships equal to one OS.  
Memory used  
Press [NAV MENU] and [0]. Memory used appears as below:  
MEMORY IN USE  
OWN SHIP  
TARGET  
MARK  
= 3456  
= 1124  
= 0021  
Smoothing  
Even when the vessel is sailing in a straight line the track shown on the display looks irregular.  
This is due to signal variation of the external navaid. You can compensate for this irregularity  
with smoothing.  
A smoothing factor between 1 and 9 is available. OFF provides no smoothing. In most cases a  
smoothing setting between 1 and 5 is satisfactory.  
1. Press [NAV MENU] and [5] in order.  
2. Press [8] to select smoothing factor.  
3. Press [ENTER].  
Erasing Track  
In the busy traffic, the screen may become cluttered. You can remove all or a percentage of  
own ship wakes from the memory to clear the display. Wakes of other ships can also be  
cleared.  
1. Press [NAV MENU].  
2. Press [9] to display the PLOTTER ERASE menu.  
[PLOTTER ERASE]  
1 [VIDEO PLOTTER 1]  
2 OWN SHIP PLOT  
3 TARGET PLOT  
4 MARK  
30%/50%/80%/ALL  
30%/50%/80%/ALL  
OFF/ALL  
5 WPT  
OFF/ALL  
6 NAV LINE  
OFF/ALL  
3. Press [2] several times to select OWN SHIP PLOT and the amount of track points you wish  
to erase.  
4. Press [ENTER].  
5. To erase other ship's track, press [3] to select TARGET PLOT and the amount of track to  
erase. To ERASE means an action to remove the relevant data from the memory. Once  
removed, the data will not be recalled any more.  
6. Press [ENTER].  
-4.7-  
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4.6 Marks, Lines  
Entering Marks  
You can inscribe marks on the display to note important points, for example, a buoy or a  
wreck. The mark memory capacity is 6,000 points.  
Selecting method of entry  
Marks can be entered by cursor position or own ship's position.  
1. Press [NAV MENU] [0] [6] in order.  
2. Press [6] to select method of mark entry; CURSOR, L/L or OWN SHIP POSN.  
3. Press [ENTER].  
4. Press [NAV MENU].  
Entering marks/lines at CURSOR or OWN SHIP POSITION mode  
1. Press [MARK] key to display the ENTER MARK menu.  
°
MARK  
21 LINE CHANGE  
22 MAR CANCEL  
CANCEL ENTER MAR : CANCEL E  
2. Enter mark number to select desired mark, followed by the ENTER key. On the OWN  
SHIP POSN mode, selected mark is entered to own ship's position.  
3. On the CURSOR mode, operate the trackball to place the cursor on the position desired for  
the mark.  
4. Press the [ENTER].  
5. To escape the mark entry mode, press the CANCEL key.  
Entering marks on L/L mode  
1. Press the MARK key.  
2. Enter latitude by numeric keys followed by the ENTER key.  
3. Enter longitude followed by the ENTER key.  
4. Enter mark number to select desired mark followed by the ENTER key.  
5. To escape the mark entry mode, press the CANCEL key.  
-4.8-  
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Line change feature  
The line change allows you to change line type, or to inscribe a separate line. For example,  
you want to quit making nav lines and start making a coastline.  
1. Press the [MARK] key to open the ENTER MARK menu.  
2. Enter 21 to select LINE CHANGE.  
3. Enter line no. desired.  
4. Enter line.  
Erasing marks/lines  
When the mark memory becomes full no marks can entered unless you erase unnecessary  
marks.  
Erasing individual marks  
1. Press the [MARK key to open the ENTER MARK menu.  
2. Enter 22 (MARK CANCEL).  
3. Operate the trackball to place the cursor on the mark you want to erase.  
4. Press [ENTER].  
Erasing all marks and all lines  
1. Press [NAV MENU] and [9] key in order.  
2. Press [4] key twice to select MARK OFF followed by [ENTER].  
Erasing lines  
1. Press the [MARK] key to open the mark menu.  
2. Enter 22 for MARK CANCEL.  
3. Operate the trackball to place the cursor on the starting or end point of the line you want to  
erase. Selecting the intersection of two lines, erasing both lines.  
4. Press the [ENTER] key.  
4.7 Waypoints  
Entering Waypoints  
Maximum 98 waypoints, NO. 01- 98, can be entered by the trackball, by latitude and  
longitude, or at own ship position.  
1. Press [NAV MENU], [4] and [2] key. The following display appears.  
-4.9-  
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[ENTER WPT]  
1 [ENTER WPT, NAV LINE]  
2 ENTER WPT  
3 WPT NO.  
CURSOR. L/L /OWN SHIP POSN  
xx  
xx°xx.xxxN/S  
xxx°xx.xxxE/W  
2. Press [2] several times to select CURSOR, L/L or OWN SHIP POSITION whichever is  
preferred, followed by [ENTER].  
3. Press [3] twice.  
4. a. By CURSOR:  
Operate the trackball to place the cursor at a location desired for  
waypoint.  
b. By L/L: Enter latitude followed by [ENTER] and longitude followed by [ENTER].  
c. By OWN SHIP POSITION: No action in this stage.  
5. Enter waypoint number in two digits and press [ENTER].  
6. To enter another waypoint, repeat steps 4 and 5.  
The Waypoint List  
To display all registered waypoints, press [NAV MENU], [1], [4] and [3]. Waypoint 00  
through 09 are shown. Empty waypoints have all asterisks. To go to next page, press [0].  
Pressing [1] returns to previous page.  
[WPT LIST]  
1 [ENTER WPT, NAVLINE]  
WPT  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
xx xx° xx.xxxN  
xxx° xx.xxxE  
9 ERASE  
WPTxx  
0 [WPT LIST 2]  
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Displaying a Waypoint  
A single waypoint may be shown on the display.  
1. Press [NAV MENU], [2] to choose the WAYPOINT menu.  
[WAYPOINT]  
1 [NAV INFORMATION 1]  
[WAYPOINT]  
1 [NAV INFORMATION 1]  
2 WPT MARK  
3 WPT  
OFF/ON  
WPTxx  
WPTxx  
WPTxx  
WPTxx  
WPTxx  
2 WPT MARK  
3 WPT  
OFF/ON  
OFF/ON  
OFF/ON  
4 WPT LINE  
5 WPT NO.  
4
5
6
6
7
8 ARRIVAL ALARM  
OFF/ON  
x.xxNM  
7 WPT DATA  
8 ARRIVAL ALARM  
VIDEO PLOTTER/NAVAID  
OFF/ON  
x.xxNM  
VIDEO PLOTTER selected at 7 WPT DATA  
NAVAID selected at 7 WPTDATA  
3. Press [2] key twice to select WPT ON and then press [ENTER].  
4. Press [3] key.  
5. Enter waypoint number in two digits and press [ENTER]. Registered waypoint (01 to 98).  
The latitude and longitude position of the waypoint appears on the menu and the waypoint  
is displayed on the screen. Five waypoints may be displayed.  
To hide a waypoint, press [3] (WPT), enter waypoint to hide, press [2] to show WPT MARK  
OFF, select OFF, and then press [ENTER]  
Deleting Waypoints  
Waypoints can be deleted individually, or collectively through the waypoint list.  
Deleting individual waypoints  
1. Press [NAV MENU], [4] and [3] to display the WPT LIST 1 menu.  
2. Press [0] to display the page which contains the waypoint you want to delete.  
3. Press [9] and enter waypoint number in two digits.  
4. Press [ENTER].  
Deleting all waypoints  
1. Press [NAV MENU] and [9] to display the PLOTTER ERASE menu.  
2. Press [5] twice followed by [ENTER].  
Note: Waypoints used for navigation lines cannot be deleted except by editing or deleting  
navigation line.  
-4.11-  
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You can show the external waypoint from a navaid by following steps.  
1. Press [NAV MENU] and [2] to open WAYPOINT menu.  
2. Press [7] to select WPT DATA.  
3. If NAVAID is not in reverse video, press [7] again.  
4. Press [2]. If ON is not in reverse video, press [2] again.  
5. Press the ENTER key.  
4.8 Navigation Lines  
30 navigation lines may be entered, and each line may have up to 30 waypoints.  
Entering New Navigation Line  
1. Press [NAV MENU], [4], [5] and [2].  
2. Enter navigation line number in two digits and press [ENTER].  
3. Enter waypoint number in two digits and press [ENTER].  
4. Repeat step 4 to continue entering waypoint numbers.  
5. Press [NAV MENU] to register navigation line.  
Adding Waypoint to Navigation Lines  
To add waypoints to a navigation line;  
1. Press [NAV MENU], [4] and [5].  
2. Press [2]. Enter navigation line number and press [ENTER] , [CANCEL].  
3. Press [8].  
4. Enter “FROM” waypoint number to add and press [ENTER].  
5. Enter waypoint number to add.  
Newly added waypoint  
8 ADDING  
WPT00 -> 00  
9 ····  
"from" waypoint  
6. Press [NAV MENU] to close the menu.  
Removing Waypoints in Navigation Lines  
1. Press [NAV MENU], [4] and [5].  
2. Press [2] and enter navigation line number and press [ENTER], [CANCEL]  
3. Press [9], enter waypoint number and press [ENTER].  
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Nav Line List  
Press [NAV MENU], [4] and [6] to display the list.  
Deleting individual navigation lines  
1. Press [NAV MENU], [4], [6] and [9].  
2. Enter navigation line number you want to delete. (The line in use is not deleted.)  
3. Press [ENTER].  
Deleting all navigation lines  
1. Press [NAV MENU] and [9].  
2. Press [6] twice to select ALL.  
3. Press [ENTER].  
Displaying Navigation Lines  
Navigation lines may be set up as follows:  
1. Press [NAV MENU] and [3].  
2. Press [2] to select NAV LINE.  
3. If ON is not in reverse video, press [2] again.  
4. Press [ENTER].  
[NAVLINE]  
1 [NAV INFORMATION 1]  
2 NAV LINE  
OFF/ON  
[NAV LINE]  
OFF/ON  
3 NAV LINE NO.  
4 NAV WIDTH  
xx/xx/xx/xx/xx  
OFF/ON  
x.xxNM  
1 [NAV INFORMATION]  
2 NAV LINE  
3
4 NAV WIDTH  
OFF/ON  
x.xxxNM  
OFF/ON  
5
5 WPT NO.  
6
6 WPT  
xx  
(x) xx→  
(xx) (xx)  
VIDEO PLOTTER/NAVAID  
OFF/ON  
7
7 NAVLINE DATA  
8 ARRIVAL ALARM  
8 ARRIVAL ALARM  
OFF/ALL  
x.xxNM  
OFF/ON/REVISED  
9 TURNING LINE  
x.xxNM  
9
VIDEO PLOTTER selected at 7 WPT DATA  
NAVAID selected at 7 WPT DATA  
5. Press [7] to choose NAV LINE DATA; VIDEO PLOTTER for internally generated  
navigation width data or NAVAID for external navaid generated data.  
6. Press [ENTER].  
7. Press the [3] key, enter in two digits the nav line no(s). (five max.) to display and press  
[ENTER]. (To erase a nav line press [3], enter 00 at location of nav line no. on the menu  
and press [ENTER].  
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and press [ENTER].  
8. Press [4] to select NAV WIDTH.  
9. Enter line width (in nautical miles) and then press [ENTER].  
10. To display waypoint number of the route on the display, press [5] to select ON and then  
press [ENTER].  
11. To skip a waypoint, press [6], enter next waypoint to head to, and then press [ENTER].  
12. Press [ENTER].  
13. To display navline from navaid, press [NAV MENU], [3], [7] (NAVLINE DATA NAV  
AID).  
15. Enter navigation line number and then press [ENTER].  
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4.9 Recording & Replaying Data  
Formatting Memory Cards  
Before you can use a memory card (RAM card) with the RP-26, the card must be formatted.  
Formatting prepares the recording surface of the card for use with the system. Insert a new  
memory card in the lower slot and follow the procedure below to format it.  
1. Press [NAV MENU] and [6] to choose CARD.  
2. If RECORD is not in reverse video, press [6] again.  
3. Press [ENTER].  
[RECORD CARD]  
1 [VIDEO PLOTTER 1]  
2 OWN SHIP PLOT  
T
3 TARGET PLOT  
4 MARK  
A
M
5
6
7
8
9
0 FORMAT  
NO/YES  
4. Press [0] twice to select YES.  
5. Press [ENTER].  
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Recording Data  
When the track memory becomes full, the oldest track is erased to make room for the latest.  
Further, when the mark memory becomes full you cannot enter another mark unless you erase  
a mark. Thus you should save important data to a memory card.  
1. Insert a formatted RAM card into the card drive.  
2. Press [NAV MENU] and [6] to choose CARD.  
3. If RECORD is not in reverse video, press [6] again.  
4. Press [ENTER].  
5. To record own ship's track press [2]; target track press [3]; marks press [4]; or radar map  
press [5].  
6. Enter file name. You may use ten figures.  
7. Press [ENTER].  
Replaying Data  
1. Press [NAV MENU] and [6].  
2. If REPLAY is not in reverse video, press [6] again.  
3. Press [ENTER].  
[REPLAY CARD 1]  
1 [VIDEO PLOTTER]  
2 XXX  
3 XXX  
4 XXX  
5 XXX  
6 XXX  
7 XXX  
8 XXX  
9 XXX  
0 [REPLAY CARD 2]  
4. Press numeral key to select file to replay. You can go to the next page by pressing [0].  
5. Press [ENTER].  
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4.10 Initial Settings  
An item on the PLOTTER DISP SELECT menu can be deleted through the VIDEO  
PLOTTER INITIAL SETTING menu.  
1. Press [NAV MENU].  
2. Press [0] twice to display the VIDEO PLOTTER INITIAL SETTING menu.  
[VIDEO PLOTTER INITIAL SETTING]  
1 [VIDEO PLOTTER 2]  
2 DANGER HIGHLIGHT  
3 COASTLINE  
4 LAND DENSITY  
5 PLACE NAME  
6 MARK  
7 OWN SHIP PLOT  
8 TARGET PLOT  
9 CONTOUR LINE  
0 GRID  
ON/OFF  
ON/OFF  
ON/OFF  
ON/OFF  
ON/OFF  
ON/OFF  
ON/OFF  
ON/OFF  
ON/OFF  
3. Press appropriate numeral key to turn on or off item.  
4. Press [ENTER].  
5. Repeat 3 and 4.  
NOTE: If Video Plotter fails to provide intended functions, turn ON the required functions on this  
menu.  
4.11 Latitude Error Table (on 96 nm range scale)  
The longitude lines concentrate on the north pole and south pole, namely, 1 nm is equivalent  
to 1 minute at 0 degree latitude, 2 minutes at 60 degrees latitude, 3 minutes at 70 degrees  
latitude and so on. For this reason, a longitude error occurs on the radar display. For example,  
when own ship is at 60°N and 135°E, even if the cursor indication is 62°N and 139°E, the real  
cursor position is deviated to left (west) side. The table below shows the longitude error,  
represented from 0° to 90° at 96 nm from the radar center (own ship).  
Real crsor position  
Real crsor position  
R: Error  
62°N  
62°N  
Crsor position  
indeicated  
Crsor position  
indicated  
96 nm  
θ
60°N  
LAT  
E
139°E  
135°E  
OS position  
-4.17-  
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EBL  
LAT  
5°  
10°  
15°  
20°  
25°  
30°  
35°  
40°  
45°  
75°  
70°  
65°  
60°  
55°  
50°  
45°  
40°  
35°  
30°  
25°  
20°  
15°  
10°  
5°  
0.2256  
0.21980213 0.43290201 0.632803  
0.21229339 0.41810678 0.61115946 0.78556318 0.93600295 1.05790007 1.14755221 1.20224625 1.22034042  
0.20316898 0.40012949 0.58486463 0.75173456 0.89565021 1.0122297 1.09793265 1.15016811 1.16737294  
0.4444  
0.6496  
0.8350  
0.9950  
1.1248  
1.2202  
1.2786  
1.2980  
0.8134132  
0.96923215 1.09551918 1.1884382  
1.24517456 1.26402037  
0.19249832 0.37910698 0.55411863 0.71218478 0.84848102 0.95885565 1.03998717 1.08933651 1.10552105  
0.18036264 0.35519924 0.51915545 0.66721485 0.79485438 0.89818413 0.97406698 1.02021439 1.03525547  
0.16685429 0.32858822 0.48024119 0.61716701 0.73517843 0.83067689 0.90076355 0.94332783 0.95711098  
0.15207608 0.29947644 0.437672  
0.13614047 0.26808546 0.39177186 0.53339693 0.59953781 0.67725844 0.73420069 0.76865661 0.77961957  
0.11916876 0.2346542 0.3428901 0.44054055 0.52460545 0.59251483 0.6422089 0.67220131 0.68162348  
0.56242216 0.66990732 0.7568477  
0.82060477 0.85926197 0.87168229  
0.10129001 0.19943707 0.29139874 0.37433139 0.44568053 0.50326182 0.54532952 0.57063015 0.57843983  
0.08264056 0.16270211 0.23768966 0.30527334 0.36336372 0.41017869 0.44429984 0.46471615 0.47085389  
0.06336208 0.12472888 0.18217162 0.23389198 0.27828148 0.31397386 0.33988878 0.35526538 0.35968447  
0.04360137 0.0858064  
0.02350833 0.04623087 0.0674093  
0.00323737 0.0063035 0.00903844 0.01130406 0.01299309 0.01403609 0.0144058  
0.12526714 0.16073056 0.19108136 0.21537949 0.23289096 0.24311083 0.24577764  
0.08634588 0.10242699 0.11514595 0.1241207 0.12910605 0.13000029  
0°  
0.0141187  
0.01323356  
EBL  
50°  
55°  
1.2192  
60°  
1.1233  
65°  
0.9933  
70°  
0.8332  
75°  
0.6479  
80°  
0.4431  
85°  
90°  
LAT  
75°  
70°  
65°  
60°  
55°  
50°  
45°  
40°  
35°  
30°  
25°  
20°  
15°  
10°  
5°  
1.2780  
1.24442563 1.18701379 1.09356117 0.96694117 0.81103484 0.3061092  
1.20131324 1.14577786 1.05546143 0.93315023 0.78260251 0.60843159 0.41596331 0.21107193  
1.14905813 1.09582188 1.00932899 0.89225746 0.74821409 0.58162173 0.397582 0.20171772  
1.08805799 1.03752602 0.95551494 0.84457408 0.70813132 0.55038538 0.37617487 0.19082831  
1.0187708 0.97133397 0.89442885 0.79046297 0.66265924 0.51496026 0.35190481 0.17848659  
0.2249  
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0.43117887 0.21881975  
0.94174265 0.89774948 0.82653562 0.73033596 0.61214392 0.47561599 0.32495654 0.16478648  
0.85754099 0.81733258 0.75235195 0.66465066 0.55696981 0.43265198 0.29553516 0.14983224  
0.76681293 0.73069528 0.63744242 0.59390696 0.49755683 0.38639524 0.26386458 0.13373769  
0.67024897 0.63849695 0.58741521 0.51864327 0.43435714 0.33719779 0.23018583 0.11662531  
0.568584  
0.46259176 0.44026091 0.40463016 0.35687717 0.29854675 0.23149802 0.15784242 0.07987479  
0.35307892 0.3357319 0.30826343 0.2716059 0.22696965 0.17580013 0.11972833 0.06051633  
0.2487894 0.22864776 0.20955062 0.18426754 0.15366517 0.1187643  
0.12684572 0.11982348 0.10624302 0.09552679 0.0791912  
0.54143927 0.49791741 0.43943239 0.36785173 0.28543407 0.19475522 0.09862535  
0.08070304 0.0406973  
0.04106355 0.04106355 0.02056855  
0°  
0.01184713 0.01008727 0.008104  
0.00605903 0.00411455 0.00111154 0.00111154 0.00028325  
-4.18-  
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4.12 Plotter Presentation Mode  
The plotter presentation mode lets you use factory preset settings or user settings for colors,  
brilliance and background of the radar screen; brilliance and color for chart elements and chart  
data on/off.  
1. Press the [NAV MENU] key.  
2. Press the [7] key to select PLOTTER PRESENTATION.  
3. Press the [7] key again to select DEFAULT or USER SET.  
4. Press the [ENTER] key.  
5. Press the [NAV MENU] key to finish.  
Below are the settings of DEFAULT.  
Item  
Default Setting  
Radar color, brilliance, background  
Background color  
Echo color  
Black  
Yellow  
Bright  
M2  
Head line  
Plot brilliance  
Range rings  
OFF  
Brilliance and color of chart elements  
Chart  
M1  
M1  
M1  
Symbols  
L/L grid  
Chart information  
Danger highlight  
Coast line  
Land density  
Place name  
Marks  
ON  
ON  
ON  
OFF  
OFF  
OFF  
OFF  
OFF  
OFF  
Own ship plot  
Target plot  
Contour line  
Grid  
-4.19-  
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Chapter 5 MAINTENANCE  
WARNING  
Do not open the equipment.  
Hazardous voltage which can  
cause electrical shock exists  
inside the equipment. Only  
qualified personnel should  
work inside the equipment.  
Turn off the radar power  
switch before servicing the  
antenna unit. Post a warn-  
ing sign near the switch  
indicating it should not be  
turned on while the antenna  
unit is being serviced.  
Prevent the potential risk of  
being struck by the rotating  
antenna and exposure to  
RF radiation hazard.  
Wear a safety belt and hard  
hat when working on the  
antenna unit.  
Serious injury or death can  
result if someone falls from  
the radar antenna mast.  
Periodic checks and maintenance are important for proper operation of any electronic systems.  
This chapter contains maintenance instructions to be followed to obtain optimum performance  
and the longest possible life of the equipment.  
5.1 Periodic Maintenance Schedule  
Interval  
Check point  
Check and measures  
Check for corroded or loosened Sealing compound may be used  
nuts and bolts. If necessary, instead of paint. Apply a small  
clean and repaint them thickly. amount of grease between nuts  
Remarks  
3 to 6  
months  
Exposed nuts and  
bolts on antenna  
unit  
Replace them if heavily  
corroded.  
and bolts for easy removal in  
future.  
Antenna radiator  
Check for dirt and cracks on  
radiator surface. Thick dirt  
should be wiped off with soft  
cloth dampened with fresh  
Do not use plastic solvent  
(acetone) for cleaning. If you need  
to remove ice from antenna unit,  
use a wooden hammer or plastic  
water. if a crack is found, apply head hammer. Crack on the unit  
a slight amount of sealing  
compound or adhesive as a  
may cause water ingress, causing  
serious damages to internal  
temporary remedy, then call for circuits.  
repair.  
-5.1-  
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Terminal strips and Open antenna cover to check  
When closing antenna covers in  
position, be careful not to catch  
plugs in antenna  
unit  
terminal strip and plug  
connections inside. Also check loose wires between covers and  
the rubber gasket of antenna  
covers for deterioration.  
unit.  
6 months to CRT and  
High voltage at CRT and  
If CRT anode rubber cap or wire  
one year  
surrounding  
components  
surrounding components attract sheath is cracked, ask your dealer  
dust in environment which will to replace it. Wait for at least 3  
cause poor insulation. Ask your minutes until high voltage  
nearest FURUNO components (CRT and HV  
representative or dealer to clean capacitors) discharge their  
internal high-voltage  
components.  
residual charges before accessing  
them.  
Terminal strips,  
sockets, earth  
terminal  
Check for loose connections.  
Check contacts and plugs for  
proper seating, etc.  
5.2 Life Expectancy of Major Parts  
Parts  
Type  
Life expectancy  
Remarks  
Antenna motor D8G-571 (X-band) 42 rpm Gears more than 10,000 h Wind load 100 kt  
D8G-516 (X-band) 24 rpm  
Magnetron  
MG 5241, X-band, 12 kW 2,000 - 3,000 h  
MG 5436, X-band, 25 kW  
MG 5223F, S-band, 30 kW  
MG 5240, S-band, 60 kW  
5.3 Replacement of Battery  
A battery installed on the RP board or Gyrocompass board inside the display unit help preserve  
the data when the power is turned off. The life of the battery is about five years. When the battery  
voltage is low, NG appears at diagnostic test for RP board. Contact your dealer for replacement.  
Battery Type  
ER3s  
Code number  
000 127 759  
000 103 769  
RP board  
GC board  
CR 1/2 8.L  
-5.2-  
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Chapter 6  
TROUBLESHOOTING  
WARNING  
Do not open the equipment.  
Hazardous voltage which can  
cause electrical shock exists  
inside the equipment. Only  
qualified personnel should  
work inside the equipment.  
Turn off the radar power  
switch before servicing the  
antenna unit. Post a warn-  
ing sign near the switch  
indicating it should not be  
turned on while the antenna  
unit is being serviced.  
Prevent the potential risk of  
being struck by the rotating  
antenna and exposure to  
RF radiation hazard.  
Wear a safety belt and hard  
hat when working on the  
antenna unit.  
Serious injury or death can  
result if someone falls from  
the radar antenna mast.  
6.1 Easy Troubleshooting  
This paragraph describes how to cure operational problems, which can be made by observing  
the radar picture and using operator controls and keys without opening the display unit,  
antenna unit or other equipment units.  
The table below shows user-level troubleshooting procedures.  
Problem  
Remedy  
Key beep inaudible  
No own ship mark  
Adjust key beep level on RADAR 2 menu referring to paragraph 1.32.  
On the R-type, check that SHIP’S MARK ON is selected at the RADAR 2 menu,  
referring to section 1.32. Also, own ship information (length, width, etc.) should  
have been entered in initial settings. Consult your service representative or  
Furuno dealer for details. On the IMO-type, the own ship marks is not available.  
-6.1-  
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6.2 Advanced-level Troubleshooting  
This paragraph describes how to cure hardware and software troubles which should be carried  
out by qualified service personnel.  
Note: This radar equipment contains complex modules in which fault diagnosis and repair  
down to component level are not practicable by users.  
Serviceman qualification  
All adjustments of radio transmitter during or coinciding with the installation, servicing, or  
maintenance which may affect the proper operation must be performed by or under the  
immediate supervision and responsibility of a person holding an operator certificate containing  
a ship radar endorsement.  
This is what the U.S. Codes of Federal Regulations part 80.169 implies (not exact extract).  
As such, every administration sets forth its own rule; service personnel must be aware of this  
kind of competency requirements.  
Service call  
When making a service call to your service agent, check S/N and symptom beforehand.  
Problem  
Probable causes or check Remedy  
points  
Power turned on but radar does 1 Blown fuse F1 and F2. 1 Replace blown fuse.  
not operate at all.  
2
3
4
1
Mains voltage/polarity  
Power supply board  
Illumination lamps  
2 Correct wiring and input voltage.  
3 Replace power supply board.  
4 Replace defective lamps.  
Control panel is not illuminated.  
CRT brilliance adjusted but no  
picture  
RADAR 1/2/3 menu  
settings  
1 In case of single display installation  
without radar interswitching unit, make  
sure RADAR 1 is selected on RADAR 3  
menu.  
2
CRT high tension  
voltage  
2 Check high tension voltage supply with  
utmost care. DANGER.  
3
1
SPU board  
3 Replace SPU board.  
Antenna not rotating  
Antenna drive  
1 Make sure that there is no short circuit  
across #1 and #2 of J461 on IN 9170  
board.  
mechanism (note that  
the message BRG SIG  
MISSING appears in  
standby.  
2
3
Defective antenna  
drive motor relay  
(thermal relay K2,  
200/220/380, 440/100  
VAC)  
2 Press relay reset button.  
INT 9170 board.  
3 Check that antenna switch is on.  
-6.2-  
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Data and marks not displayed  
in Transmit status  
1
SPU board  
IF amplifier  
1 Replace SPU board.  
1 Replace IF amplifier.  
Adjust GAIN control with A/C  
SEA control set at minimum.  
Marks and legends appear but  
no noise or echo  
1
2
Signal cable between  
antenna and display  
2 Check continuously and isolation of  
coaxial cable. Note: Disconnect the plug  
and lugs at both ends of coaxial cable  
before checking it by ohmmeter.  
3 Check video coax line for secure  
connection. If connection is good,  
replace SPU board.  
3
1
Video amplifier board  
Marks, legends and noise  
appear but no echo  
TX fuse F801  
(Transmitter unit)  
1 If fuse is blown, replace it. If it blows  
again, the modulator or associated circuit  
may be defective.  
(Transmission leak representing  
own ship position is absent)  
2 Check magnetron current with the check  
meter in the sub panel. Replace  
magnetron.  
2
Magnetron  
3
4
Modulator board  
SPU board  
3 Replace modulator board.  
4 Replace SPU board.  
Picture not updated or picture  
freeze-up  
1
Bearing signal generator 1 Check the connection of signal cables.  
board (in antenna unit)  
2
3
SPU board  
2 Replace SPU board.  
Video freeze-up  
3 Turn off and on the radar.  
Incorrect orientation of picture  
1
SPU board  
1 The message HD SIG MISSING  
appears when the heading pulse is not  
received during standby.  
2
Gyro interface  
2 Replace the gyro interface.  
TUNE control adjusted but poor 1 Deteriorated magnetron 1 With radar transmitting on 48 nm range,  
sensitivity  
check magnetron current. If current is  
below normal, magnetron may be  
defective. Replace it.  
2
Detuned MIC  
2 Check MIC detecting current. If it is  
below normal value, MIC may have  
become detuned. MIC must be tuned.  
3
4
Dirt on radiator face  
3 Clean the radiator surface.  
Water ingress to the  
waveguide or other  
feeder line  
4 Remove water from the feeder line.  
5
1
Second trace rejection is  
ON  
5 Disable the second-trace rejecter  
referring to section 1.35.  
Range changed but radar  
picture not changing  
Defective range key  
1 Try to hit [+] and [-] range keys several  
times. If unsuccessful, replacement of  
keypad may be required.  
2
3
4
SPU board  
2 Replace SPU board.  
3 Replace mother board.  
4 Turn off and on radar.  
1 Repair contact of key.  
2 Replace SPU board.  
Mother board  
Video freeze-up  
Interference rejector inoperable 1 Bad contact of key  
(interference rejection level not  
2
SPU board  
displayed)  
-6.3-  
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Echo stretch ineffective (Neither 1 SPU board  
ES1 nor ES2 is displayed)  
1 Replace SPU board.  
Only 2 parallel index lines when 1 Incorrect setting of index 1 Set index line interval referring to section  
6 lines are wanted  
line intervals  
1.26.  
Range rings are not displayed  
1
Adjust the brilliance of  
range rings at the  
BRILLIANCE 1 menu to  
see if intensity is  
increased.  
1 Replace associated circuit board if  
unsuccessful.  
2 Replace SPU board.  
2
1
SPU board  
Poor discrimination in range  
Sea clutter control not  
functioning properly  
1 Improper setting of A/C SEA control. If  
A/C SEA is seen only at very close  
range, suspect inaccurate frequency of  
reference oscillator.  
True motion presentation not  
working correctly  
1
Poor contact of MODE 1 Try to press MODE key a little harder.  
key  
2 Press MODE key until TM appears.  
2
3
4
Selection not accessed  
3 Enter correct own ship speed referring to  
Speed entry incorrect  
TM display inaccurate  
section 1.24.  
4 Make sure that speed and compass  
inputs are accurate.  
Target nor tracked correctly  
1
Poor definition of targets 1 Adjust A/C SEA and A/C RAIN controls  
in sea clutter referring to section 1.13 and 1.14.  
6.3 Diagnostic Test  
A diagnostic test program is provided to enable testing of major circuit boards in the radar  
display unit. Note that the normal radar picture is lost during this test.  
Proceed as follows to execute the diagnostic test:  
Proceed as follows to execute the diagnostic test:  
1. Press the RADAR MENU key to show the FUNCTIONS 1 menu.  
2. Press the [0] key three times to show the FUNCTIONS 4 menu.  
3. Press the key [3] to select menu item TEST. Then, press the ENTER key.  
Program numbers appear. The diagnostic test is executed and the screen shows test results  
as shown on the next page. OKs appear for normal operation. If NG (No good) appears,  
corresponding components may be defective. Consult your dealer.  
4. Small squares displayed at the right bottom of the test result screen are for testing the  
control and keys on the operator control panel. As you operate these controls and keys,  
corresponding squares are highlighted, indicating that your control/key operations are  
properly recognized.  
5. To terminate the diagnostic test, press STBY/TX key once or twice.  
-6.4-  
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RADAR MENU  
Press [RADAR MENU] key.  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 GUARD ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM *  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
Press [0] key.  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK(GRN CHAR)/  
BLK(RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
BRT BLU  
3 ECHO STRETCH  
4 ECHO AVERAGE  
OFF/1/2/3  
OFF/1/2/3  
5 TARGETS COLOR YEL/GRN/COLOR*  
6 SHIP SPEED  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
7 SET, DRIFT OFF/MAN  
SET = xxx.x°  
DRIFT = xx.xKT  
8 INDEXLINES  
NO. 2 VRM/MAN  
MAN = xx.xx NM  
9 BRILLIANCE (1)  
0 [FUNCTION 3]  
Press [0] key.  
[FUNCTIONS 3]  
[FUNCTIONS 2]  
2 RADAR 1  
1
3 FUNCTION KEY 1  
4 FUNCTION KEY 2  
5 FUNCTION KEY 3  
6 FUNCTION KEY 4  
7 RADAR*  
1/2  
7 INTERSWITCH  
8
9 GYRO SETTING  
EBL = xxx.x°  
0 [FUNCTIONS 4]  
Press [0] key.  
[FUNCTIONS 4]  
1 [FUNCTIONS 3]  
2
3 TEST  
*: R-type only  
-6.5-  
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The test program checks the logic boards and the keyboard. The squares () represent the  
corresponding keypads. Numerals indicate the position of the controls under check. Note:  
Analog controls such as Brilliance, A/C Rain, A/C Sea and Gain controls can not be tested.  
FR-2105 TEST  
PROGRAM NO  
MAIN 0359149103  
ARPA 1859038103  
ROM  
OK  
RAM  
OK  
CRAM  
DISPSW  
1234  
OK  
OK  
OK  
OK  
OK  
OK  
OK  
OK  
OK  
OK  
1010  
0001  
DSP  
RP  
1859039101  
0359150102  
DRAM  
RP BOARD BAT  
RP CARD 1  
OK  
OK  
OK  
CARD 2  
OK  
CARD 1 BAT  
ANTENNA SPEED  
TRIG FREQ  
42 RPM  
872 Hz  
11 V  
MAG CURRENT  
R. MONITOR  
TUNE IND  
1.2 V  
1.1 V  
□ □ □  
□ □ □  
□ □ □  
1 2 3  
□□ □□ □□  
□□  
002  
2 5 1  
0 0 8  
□□ □ □ □  
□ □ □  
To quit press [STBY/TX] key twice.  
To quit the test program, press the [STBY/TX] key twice.  
-6.6-  
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Chapter 7  
MENU OVERVIEW  
[BRILLIANCE 1]  
RADAR MENU  
1 [FUNCTIONS 2]  
2 RINGS BRILL  
3 EBL BRILL  
4 VRM BRILL  
OFF/DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
[FUNCTIONS 1]  
1 TARGET TRAILS  
5 +CURSOR BRILL OFF/DIM/M1/M2/BRT  
6 CHAR BRILL  
7 MARK BRILL  
8 TRAIL BRILL  
9 HL BRILL  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M/BRT  
2 TARGET ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM*  
1 or 2  
1 to 10  
0 [BRILLIANCE 2]  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
[0]  
9 VIDEO PLOT  
0 [FUNCTIONS 2]  
[BRILLIANCE 2]  
[9]  
1 [BRILLIANCE 1]  
2 PLOT BRILL  
3 L/L GRID BRILL  
4 CHART BRILL  
[0]  
OFF/DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
DIM/M1/M2/BRT  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR  
BLK (GRN CHAR)/  
5 SYMBOLS BRILL DIM/M1/M2/BRT  
BLK (RED CHAR)/  
BLU (ECHO AREA)  
BLU/  
[RADAR 1]  
1 [FUNCTIONS 3]  
BRT BLU  
3 ECHO STRETCH  
OFF/1/2/3  
2 EBL 1 *  
3 EBL 2 *  
4 VRM 1 *1  
5 VRM 2 *1  
6 TRAIL  
REL/TRUE  
REL/TRUE  
NM/km  
NM/km  
REL/TRUE  
4 ECHO AVERAGE OFF/1/2/3  
[PULSE WD 1]  
5 ECHO COLOR  
6 SHIP SPEED  
YEL/GRN/COLOR*  
1 [RADAR 1] (FR2115/2125 OTHERS)  
LOG/NAV*/MAN  
MAN = xx.xKT  
(STW/SOG)  
2 0.5 NM  
S1/S2  
3 0.75 NM S1/S2/M1  
S/M1  
S/M1  
4 1.5 NM  
5 3 NM  
6 6 NM  
S1/S2/M1  
S2/M1/M2/M3 S/M1/M2  
M1/M2/M3/L M1/M2/L  
7 TRAIL GRAD SGL/MULT  
8 [PULSE WD 1]  
9 [PULSE WD 2]  
[8]  
7 SET, DRIFT OFF/MAN  
SET = xxx.x°  
DRIFT=xx.xKT  
NO.2 VRM/MAN  
MAN = xx.xx NM  
7 12-24 NM M2/M3/L  
M2/L  
0 [RADAR 2]  
8 INDEX LINES  
[0]  
9 BRILLIANCE (1)  
0 [FUNCTIONS 3]  
[9]  
[PULSE WD 2]  
1 [RADAR 1] (FR2115/2125 OTHERS)  
2 0.5 NM S1/S2  
3 0.75 NM S1/S2/M1  
[RADAR 2]  
1 [RADAR 1]  
2 + CURSOR, EBL REL/TRUE  
3 NOISE REJECT OFF/ON  
4 STERN MK*  
5 SHIP'S MK  
6 ALARM*  
[3]  
S/M1  
S/M1  
[FUNCTIONS 3]  
4 1.5 NM  
5 3 NM  
6 6 NM  
S1/S2/M1  
S2/M1/M2/M3 S/M1/M2  
M1/M2/M3/L M1/M2/L  
OFF/ON  
OFF/ON  
IN/OUT  
1 [FUNCTIONS 2]  
2 [RADAR 1]  
[2]  
3 [FUNCTION KEY 1]  
4 [FUNCTION KEY 2]  
5 [FUNCTION KEY 3]  
6 [FUNCTION KEY 4]  
7 RADAR* *3 1/2  
8
9 GYRO SETTING  
EBL = xxx.x°  
0 [FUNCTIONS 4]  
7 12-24 NM M2/M3/L  
M2/L  
7 KEY BEEP*  
8 AUDIO ALARM OFF*/L/M/H  
9 2ND ECHO  
0 [RADAR 3]  
OFF/L/M/H  
1
2
OFF/ON  
[0]  
[RADAR 3]  
OFF/ON  
1 [RADAR 2]  
2 BARGE MK*2  
3 BARGE SIZE*2 LENGTH=XXX ft  
WIDTH = xx ft  
4 [BARGE INFORMATION]*2  
5 ORIGIN MK DISP No./SYMBOL  
6 ORIGIN MK STAB GND/SEA  
[4]  
[BARGE INFORMATION]  
1 [RADAR 3]  
[4]  
2
[FUNCTIONS 4]  
0
1 [FUNCTIONS 3]  
0
0
0
0
2
7 ANTENNA REVOLUTION LOW/HIGH  
3 TEST  
8 RADAR NO.*  
9 TUNE  
1/2  
MAN/AUTO  
0 TUNE INITIALIZE  
*: R-type only  
*1: Fishing mode only (one type of R-type)  
*2: SM only (one type of R-type)  
*3: When RJ-7 is connected, changed to INTERSWITCH  
R/N/W versions: Menu does not close automatically. On G version, the menu closes automatically  
if no operation is made for 30 seconds.  
-7.1-  
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1
2
[3], [4] or [5]  
[FUNCTION KEY 1]  
1 [FUNCTIONS 3]  
2 FUNCTION KEY 1 PICTURE/OPERATION  
[FUNCTION KEY 4]  
1 [FUNCTIONS 3]  
2 FUNCTION KEY 4 OPERATION/WATCH ALARM  
3 OPERATION TARGET TRAILS/  
TARGET ALARM/ARPA/VECTOR TIME*  
VIDEO PLOT/ZOOM*  
BKGD COLOR/INDEX LINES/  
INT REJECT/2ND ECHO/ORIGIN MARK/  
PLS WD1/PLS WD 2/  
(PICT)  
(OPR)  
3 PICTURE  
FUNC1/BUOY/SHIP/  
SHORT/LONG/CRUISING/  
HARBOR/COAST/SEA/  
ROUGH SEA/RIVER*2/BIRD*1  
OFF/1/2/3  
4 INT REJECT  
5 ECHO STRETCH OFF/1/2/3  
6 ECHO AVERAGE OFF/1/2/3  
ECHO STRETCH 1/ 2/ 3  
ECHO AVG 1/ 2 / 3  
7 A/C AUTO  
OFF/ON  
ECHO COLOR/  
8 [FUNC 1 PULSE WD]  
CHAR BRILL/MARK BRILL/  
TRAIL BRILL/RINGS BRILL/  
EBL BRILL/VRM BRILL/  
9 NOISE REJECT  
0 VIDEO CONTRAST 1/2/3  
OFF/ON  
+CURSOR BRILL/HL BRILL/  
POLT BRILL/L/L BRILL/  
[8]  
CHART BRILL/ NOISE REJECT/  
BARGE MK*2  
BARGE INFORMATION*2  
[FUNC 1 PULSE WD]  
1 [FUNCTION KEY 1]  
2 0.5 NM  
3 0.75 NM  
4 1.5 NM  
5 3 NM  
6 6 NM  
7 12-24 NM M2/M3/L  
S1/S2  
S1/S2/M1  
S1/S2/M1  
S2/M1/M2/M3  
M1/M2/M3/L  
Press [2] once or twice to toggle  
between OPERATION and WATCH  
ALARM followed by ENTER key.  
(In the case of FR-2115/2125)  
[2] [2] to toggle between  
OPERATION and PICTURE menu.  
(WATCH ALARM)  
[FUNCTION KEY 4]  
1 [FUNCTIONS 3]  
2 FUNCTION KEY 4 OPERATION/WATCH ALARM  
3 WATCH ALARM INTERVAL  
[FUNCTION KEY 1]  
1 [FUNCTIONS 3]  
2 FUNCTION KEY 1 PICTURE/OPERATION  
3 OPERATION TARGET TRAILS/  
TARGET ALARM/ARPA/VECTOR TIME*  
VIDEO PLOT/ZOOM*  
(OPR)  
6/10/12/15/20 MIN  
BKGD COLOR/INDEX LINES/  
INT REJECT/2ND ECHO/ORIGIN MARK/  
PLS WD1/PLS WD 2/  
ECHO STRETCH 1/ 2/ 3  
ECHO AVG 1/ 2 / 3  
ECHO COLOR/  
CHAR BRILL/MARK BRILL/  
TRAIL BRILL/RINGS BRILL/  
EBL BRILL/VRM BRILL/  
+CURSOR BRILL/HL BRILL/  
PLOT BRILL/L/L BRILL/  
CHART BRILL/ NOISE REJECT/  
BARGE MK*2  
BARGE INFORMATION*2  
*: R-type only  
*1: Fishing mode only (one type of R-type)  
*2: SM only (one type of R-type)  
-7.2-  
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[PLOT MENU] KEY  
[EPA]  
[RADAR MAP]  
1 [NAV INFORMATION 1]  
1 VECTOR TIME  
2 COLLISION ALARM OFF/ON  
CPA x.xNM  
30SEC/1/2/3/6/12/15/30MIN  
2 MAP  
OFF/ON  
3 MAP NO.  
MAP xx  
TCPA xx.xMIN  
STD/LARGE  
OFF/ON  
MAP LIST  
xx xx xx xx xx  
xx xx xx xx xx  
3 MARK SIZE  
4 PLOT NO.  
4 NAV DATA POSN  
5 ALIGN +CURSOR DATA  
6 MARK ENTRY MODE CURSOR/OWN SHIP POSN/L/L  
7 [ENTER MAP]  
8 [MAP DISP SELECT]  
9 [MAP ERASE]  
OFF/ON  
[NAV MENU] KEY  
(Radar only mode)  
[1]  
[NAV INFORMATION 1]  
1 [RADAR MAP]  
2 SELECT NAVAID  
[7]  
[8]  
GPS+LC/DEAD  
RECKONING  
[ENTER MAP]  
1 [RADAR MAP]  
2 ENTER MAP MAP xx  
[MAP DISP SELECT]  
1 [RADAR MAP]  
2 DANGER HIGHLIGHT OFF/ON  
3 OWN SHIP POSN OFF L/L  
4 POSN  
xx°xx.xxx N/S  
xxx°xx.xxx E/S  
3 COAST LINE  
4 MARK  
5 NAV LINE  
OFF/ON  
OFF/ON  
OFF/ON  
5 +CURSOR DATA  
6 WPT DATA  
7 [NAV LINE]  
8 [WAYPOINT]  
9 WIND DATA  
OFF/L/L  
OFF/REL/TRUE  
6 PROHIBITED AREAS OFF/ON  
7 BUOY  
8 CONTOUR LINE  
OFF/ON  
OFF/ON  
OFF/ON  
0 [NAV INFORMATION 2]  
[0]  
[NAV INFORMATION 2]  
1 [NAV INFORMATION 1]  
9 ERASE MAP MAP xx  
[NAV LINE]  
1 [NAV INFORMATION 1]  
2 NAV LINE  
2 WIND GRAPH  
3 WIND UNIT  
OFF/ON  
m/s/KT  
OFF/ON  
xx - xx - xx - xx  
OFF/ON  
x.xxNM  
OFF/ON  
xx  
(xx) - -xx -  
(xx) - -xx -  
VIDEO PLOTTER/NAVAID/OFF/ALL  
OFF/ON  
3 NAV LINE NO.  
4 NAV WIDTH  
4 CURRENT DATA  
OFF/ON  
[7]  
5 CURRENT GRAPH OFF/ON  
6 DEPTH DATA  
7 DEPTH GRAPH  
8 DEPTH SCALE  
OFF/ON  
OFF/ON  
10/20/50/100/  
200/500  
m/ft  
5 WPT NO.  
6 WPT  
9 DEPTH UNIT*1  
7 NAV LINE DATA  
8 ARRIVAL ALARM  
0 [NAV INFORMATION 3]  
[0]  
[NAV INFORMATION 3]  
x.xxNM  
OFF/ON/REVISED  
9 TURNING LINE  
1 [NAV INFORMATION 2]  
2 WATER TEMPERATURE* OFF/ON  
[WAYPOINT]  
1 [NAV INFORMATION 1]  
3 DATE  
OFF/UTC/LOCAL  
±xx.xxH  
2 WPT MARK  
3 WPT  
OFF/ON  
[8]  
4 USED WPL*  
NAV LINE/WP  
WPTxx  
WPTxx  
WPTxx  
WPTxx  
WPTxx  
4 WPT LINE  
5 WPT NO.  
6
OFF/ON  
OFF/ON  
7
8 ARRIVAL ALARM  
OFF/ON  
x.xxNM  
[MAP ERASE]  
1 [RADAR MAP]  
2 DANGER HILIGHT  
3 COASTLINE  
4 MARK  
5 NAVLINE  
6 PROHIBITED AREAS  
7 BUOY  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
OFF/ALL  
[9]  
8 CONTOUR LINE  
*1: R-type only  
-7.3-  
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[VIDEO PLOTTER INITIAL SETTING]  
1 [VIDEO PLOTTER 2]  
2 DANGER HIGHLIGHT  
3 COAST LINE  
4 LAND DENSITY  
5 PLACE NAME  
6 MARK  
7 OWN SHIP PLOT  
8 TARGET PLOT  
9 CONTOUR LINE  
0 GRID  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
NAV MENU key  
(with RP-26)  
*4  
[1]  
[VIDEO PLOTTER 1]  
1 [NAV INFORMATION 1]  
2 [WAY POINT]  
[NAV INFORMATION 1]  
1 [VIDEOPLOTTER 1]  
2 SELECT NAVAID  
3 OWN SHIP POSN  
4 POSN  
GPS DEAD RECKONING  
OFF L/L  
OO° OO.OOO N/S  
OO° OO.OOO E/W  
OFF/REL/TRUE  
3 [NAV LINE]  
4 [ENTER WPT, NAV LINE]  
5 [CWN SHIP, TARGET PLOT]  
6 CARD  
REPLAY, RECORD  
5 +CURSOR DATA  
6 WPT DATA  
7 [NAV LINE]  
8 [WAY POINT]  
9 WIND DATA  
7 PLOTTER PRESENTATION DEFAULT/USER SET  
8 [DISPLAY SELECT]  
9 [ERASE]  
[*4]  
0 [VIDEO PLOTTER 2]  
OFF/ON  
0 [NAV INFORMATION 2]  
[0]  
[VIDEO PLOTTER 2]  
1 [VIDEO PLOTTER 1]  
[0]  
2 NAV DATA POSN  
3 ALIGN DATA  
4 OWN SHIP CENTER  
5
6 MARK ENTRY MODE  
7 TRAIL EAV  
8 [VIDEO PLOTTER INITIAL SETTING]  
OFF/ON  
[NAV INFORMATION 2]  
1 [NAV INFORMATION 1]  
2 WIND GRAPH  
3 WIND UNIT  
OFF/ON  
m/s/KT  
[4]  
CURSOR OWN SHIP POSN L/L  
LOG GYRO  
4 CURRENT DATA  
5 CURRENT GRAPH  
6 DEPTH DATA  
7 DEPTH GRAPH  
8 DEPTH SCALE  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
10/20/50/100/  
200/500  
m/ft  
[3]  
[OWN SHIP, TARGET PLOT]  
1 [VIDEO PLOTTER 1]  
2 RECORD OWN SHIP PLOT  
3 OWN SHIP PLOT INTVL 10/30SEC/1/2/3/6MIN  
4 OWN SHIP PLOT COLOR RED/MAGENTA/  
CYAN/BLU *5  
[ENTER WPT, NAV LINE]  
1 [VIDEO PLOTTER 1]  
2 [ENTER WPT]  
3 [WPT LIST]  
9 DEPTH UNIT*1  
OFF/ON  
0 [NAV INFORMATION 3]  
[0]  
4
5 [ENTER NAVLINE]  
6 [NAV LINE LIST]  
±XX.XH  
[REPLAY CARD 1]  
1 [VIDEO PLOTTER 1]  
2 FILE XXXXXXXXXX  
3 FILE XXXXXXXXXX  
4 FILE XXXXXXXXXX  
5 FILE XXXXXXXXXX  
6 FILE XXXXXXXXXX  
7 FILE XXXXXXXXXX  
8 FILE XXXXXXXXXX  
9 FILE XXXXXXXXXX  
4 USER CHART  
5 CURVED EBL  
6 CHART SYMBOL  
7 NOTEBOOK  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
[2]  
[ENTER NAV LINE]  
1 [ENTER WPT NAV LINE]  
2 NAV LINE ON  
[ENTER WPT]  
1 [ENTER WPT, NAV LINE]  
WPT  
2 ENTER WPT  
3 WPT NO. OO  
CURSOR/ L/L /OWN SHIP POSN  
OO° OO.OOON/S  
OOO° OO.OOOE/W  
[RECORD]  
1 [VIDEO PLOTTER 1]  
2 OWN SHIP PLOT  
T
[3]  
3 TARGET PLOT  
4 MARK  
5 RADAR MAP  
A
M
R
[WPT LIST 1]  
1 [ENTER WPT, NAV LINE]  
WPT  
6
7
8
9
8 ADDING  
9 DESELECTING  
WPTXXXX  
WPTXX  
OO  
O1  
O2  
O3  
O4  
O5  
O6  
O7  
O8  
O9  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
XX° XX.XXXN  
XXX° XX.XXXE  
WPTXX  
0 FORMAT NO/YES  
[PLOTTER DISP SELECT]  
1 [VIDEO PLOTTER 1]  
2 DANGER HIGHLIGHT  
3 COAST LINE  
4 LAND DENSITY  
5 PLACE NAME  
6 MARK  
7 OWN SHIP PLOT  
8 TARGET PLOT  
9 CONTOUR LINE  
0 GRD  
[NAV LINE LIST]  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
OFF/ON  
1 [ENTER WPT, NAV LINE]  
NAV LINEXX XX XX  
XX XX XX  
*3  
XX XX XX  
OFF/SEPARATE/CONTINUE  
OFF/ON  
OFF/ON  
OFF/ON  
[PLOTTER ERASE]  
9 ERASE  
NAV LINEXX  
1 [VIDEO PLOTTER 1]  
2 OWN SHIP PLOT  
3 TARGET PLOT  
4 MARK  
9 ERASE  
0 [WPT LIST 2]  
30%/50%/80%/ALL  
30%/50%/80%/ALL  
OFF/ALL  
*1: Fishing mode only (one type of R-type)  
*2: Radar connected INS  
*3: Items depend on the setting of  
video plotter “Initial setting”.  
5 WPT  
OFF/ALL  
6 NAV LINE  
OFF/ALL  
WAP LIST 2-10  
*4: The NAV INFORMATION 1 menu appears by  
pressing the NAV MENU key at the Radar only  
display mode.  
5* OWN SHIP PLOT COLOR not available on IMO type.  
-7.4-  
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Chapter 8 ANCILLARY EQUPMENT  
8.1 Performance Monitor  
A performance monitor is required for a radar installed on vessels of 300 GT and upward  
engaged in international voyages. For X-band radars, the FURUNO PM-30 or PM-50 satisfies  
the requirement covering 9410 ± 50 MHz. For S-band radars, the PM-50 is available covering  
3050 ± 30 MHz. The following describes how to use these performance monitors.  
The performance monitor is an independent unit, namely, it is not interconnected with any unit  
of the radar system except for the 100 VAC power cable. In some radars the power cable is not  
routed via the power switch or other control of the radar and the monitor is operated as  
completely a separate device.  
Operating the performance monitor  
When Radar Interswitch RJ-7 is connected, set it to the "straight" mode. Press the PM ON/OFF  
button in the Turning Compartment, and the range scale is automatically set to 24 nm. The radar  
screen will show several arcs, opposite to the heading marker (provided that the performance  
monitor is installed behind the radar antenna as is normally the case). If the radar transmitter and  
receiver are in good working conditions in as much as the original state when the monitor was  
turned up, the innermost are should appear at 12 nm and there should be a total of 4 arcs.  
The range of the innermost arc reduces 3 nm with every 3 dB loss of transmitted power.  
Meanwhile the receiver sensitivity can be evaluated from the number of visible arcs; one arc is  
lost every 3 dB deterioration of the sensitivity.  
Transmitter performance  
Receiver performance  
Range to innermost arc  
Loss  
0 dB  
Number of arcs  
Loss  
0 dB  
12 nm  
9 nm  
4
3
2
1
0
3 dB  
3 dB  
6 nm  
6 dB  
6 dB  
3 nm or less or none  
> 10 dB  
> 9 dB  
> 12 dB  
-8.1-  
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9 nm  
9 nm  
12 nm  
Transmitter: normal  
Receiver: normal  
Transmitter: 3 dB loss  
Transmitter: 3 dB loss  
(Transmitter system has lost a (Transmitter system has lost a  
half of initial power. Suspect half of initial power. Suspect  
magnetron and feeder system.) magnetron and feeder system.)  
Receiver: normal  
Receiver: 3 dB loss (Receiver  
has lost a half of initial  
sensitivity. Suspect receiver  
front end, water ingress in  
feeder system, etc.)  
-8.2-  
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8.2 Interswitching Unit  
The interswitching unit RJ-7 permits independent or coordinated operation of two radar systems  
among FR-2100 series, FR-2105 series and FR/FAR-2805 series. The following indicates the  
menu structure for the guideline of use.  
[FUNCTIONS 3]  
1
[FUNCTIONS 2]  
2 RADAR 1  
3 FUNCTION KEY 1  
4 FUNCTION KEY 2  
5 FUNCTION KEY 3  
6 FUNCTION KEY 4  
7 RADAR  
1/2  
7 INTERSWITCH  
8
9 GYRO SETTING  
0 [FUNCTIONS 4]  
[7]  
1 [FUNCTIONS 3]  
2 DISPLAY 1  
3 DISPLAY 2  
ANT 1M  
ANT 2M  
4
5
2 ......  
........1  
6 STORE SETTING  
7
8
9
0 [INITIAL SETTING RJ-7]  
[0]  
[INITIAL SETTING RJ-7]  
1 [INTERSWITCHING RJ-7]  
2 ANTENNA 1 LOCATION  
3 ANTENNA 2 LOCATION  
4
5
..........  
..........  
Antenna height  
6 STORE SETTING  
7
8
9
0 SET DISPLAY NO.  
1/2  
-8.3-  
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8.3 For Fishing Vessel  
This radar can be customized as a fishing vessel version with an internal setting. The fishing  
vessel version offers an additional picture setup option "BIRD," which is assignable to one of  
the function keys depending on a setting on FUNCTION KEY 1, 2 or 3 menu shown below.  
If the BIRD option is menu-selected at the time of installation, the corresponding function key is  
labeled "BIRD." Press the function key "BIRD" and the radar will be set for optimum detection  
of sea birds between 6 and 16 nm. As is well known by professional fishermen, locating a flock  
of sea birds is useful for finding certain species of fish.  
Press RADAR MENU  
[FUNCTIONS 1]  
1 TARGET TRAILS  
2 GUARD ALARM  
3 ORIGIN MARK  
4 INDEX LINES  
5 ZOOM  
1 or 2  
1 to 10  
6 PULSE WIDTH  
7 INT REJECT  
8 ARPA  
9 VIDEO PLOT  
0 [FUNCTION 2]  
Press [0] key.  
[FUNCTIONS 2]  
1 [FUNCTIONS 1]  
2 BKGD COLOR BLK(GRN)/BLK(RED)/BLU  
BLU/BRT BLU  
3 ECHO STRETCH  
OFF/1/2/3  
4 ECHO AVERAGE OFF/1/2/3  
5 TARGETS COLOR YEL/GRN/COLOR  
6 SHIP SPEED  
7 SET, DRIFT  
LOG/NAV/MAN  
OFF/MAN SET = XXX  
DRIFT =  
8 INDEXLINES  
NO.2 VRM/MAN  
MAN = XX.XX NM  
9 BRILLIANCE 1  
0 [FUNCTION 3]  
Press [0] key.  
[FUNCTIONS 3]  
[FUNCTIONS 2]  
[FUNCTIONS KEY 1]  
1 [FUNCTIONS 3]  
(PICT)  
1
2 FUNC KEY1 PICTURE/OPERATION  
2 RADAR 1  
3 PICTURE  
SHORT/LONG/CRUISING/  
HARBOR/COAST/SEA/  
ROUGH SEA/RIVER/BIRD  
OFF/1/2/3*  
3 FUNCTION KEY 1  
4 FUNCTION KEY 2  
5 FUNCTION KEY 3  
6 FUNCTION KEY 4  
7 RADAR  
7 INTERSWITCH  
8
Press [3], [4]  
or [5] key. Ex.  
[1] pressed.  
4 INT REJ  
5 ECHO STRETCH OFF/1/2/3  
6 ECHO AVERAGE OFF/1/2/3  
7 A/C AUTO OFF/ON*  
1/2  
8 [FUNC 1 PULSE WD]*  
9 NOISE REJ  
1/2/3*  
9 GYRO SETTING  
0 [FUNCTIONS 4]  
0 VIDEO CONTRAST*  
Note: Items marked * should be left in the default settings.  
-8.4-  
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Chapter 9 Digital interface  
(IEC 61162-1 Edition 1 and Edition 2)  
1. I/O Sentences of Channel 1  
Input  
BWC, BWR, DBT, DPT, GGA, GLL, MWV, RMA, RMB, RMC, RTE, VDR,WPL, ZDA,  
VTG (R-only)  
Output  
OSD (every 3 s), RSD (3 s)  
2. I/O Sentences of Channel 2  
Input  
VBW, VHW, HDT  
NOTE  
Channel 2 serial port may be connected with a multiplexer interface box IF-2300 to feed Own  
Ship speed, and Heading data.  
3. I/O Sentence of Channel 3  
Output  
TTM (every 10 s when acquiring 10 targets)  
4. Serial Signal I/O Circuit  
See succeeding page.  
NOTE: VDR is connected to the radar display unit via an optional integral interface board.  
5. Sentence Description  
See page 9-3 and after.  
Sentence without checksum will not be accepted as a proper data.  
-9.1-  
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GLL  
CHANNEL 2 INPUT  
NAV RXD A  
NAV RXD B  
GND  
VBW  
IF-2300  
HDT  
-9.2-  
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Description of Sentence  
Channel 1 Input  
BWC - Bearing and distance to waypoint - great circle  
Waypoint ID  
Mode indicator (A/D/E/M/S/N) *1  
Checksum  
Distance, nautical miles  
Bearing, degrees magnetic*2  
$--BWC, hhmmss.ss, 1111.11, a, yyyyy. yy, a, x.x, T, x.x, M, x.x, N, c—c,a*hh<CR><LF>  
Bearing, degrees true  
Waypoint longitude, E/W  
Waypoint latitude, N/S  
UTC of observation *2  
*1: Edition 2 only, *2: Not used  
BWR - Bearing and distance to waypoint - rhumb line  
Time (UTC) and distance and bearing to, location of, a specified waypoint from present position. $--BWR  
data is calculated along the rhumb line from present position rather than along the great circle path.  
Waypoint ID  
Distance TO WPT, nautical miles  
Bearing, degrees magnetic*2  
Mode indicator (A/D/E/M/S/N) *1  
Checksum  
$--BWR, hhmmss.ss, 1111.11, a, yyyyy. yy, a, x.x, T, x.x, M, x.x, N, c—c,a*hh<CR><LF>  
Bearing, degrees true  
Waypoint longitude, E/W  
Waypoint latitude, N/S  
UTC of observation *2  
*1: Edition 2 only, *2: Not used  
Note: The mode indicator character “a” has been defined as follows.  
A= Autonomous mode  
D= Differential mode  
E= Estimated (dead reckoning) mode  
M= Manual input mode  
S= Simulator mode  
N= Data not valid  
-9.3-  
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DBT - Depth below transducer  
Water depth referenced to the transducer.  
$--DBT, x.x, f, x.x, M, x.x, F*hh<CR><LF>  
Checksum  
Water depth, fathoms  
Water depth, m  
Water depth, feet  
DPT - Depth  
IMO Resolution A.224 (VII). Water depth relative to the transducer and offset of the measuring transducer.  
Positive offset numbers provide the distance from the transducer to the waterline. Negative offset numbers  
provide the distance from the transducer to the part of the keel of interest.  
Maximum range scale in use *1  
$--DPT, x.x, x.x, x.x*hh<CR><LF>  
Checksum  
Offset from transducer, in meters = distance from transducer to water-line  
Water depth relative to the transducer, in meters  
*1: Edition 2 only, however not used  
GGA - Global positioning system (GPS) fix data  
Time, position and fix related data for a GPS receiver.  
Differential reference station ID, 0000-1023 *1  
Age of differential GPS data *1  
Unit of geoid height, m *1  
Geoid height (-999 - 0999) *1  
Unit of antenna height, m *1  
Antenna height (-9999 - 99999) *1  
Checksum  
Horizontal dilution of precision (00 - 99) *1  
$--GGA, hhmmss.ss, 1111.11, a, yyyyy.yy, a, x, xx, x.x, x.x, M, x.x, M, x.x, xxxx*hh<CR><LF>  
Number of satellite in use, 00-12  
GPS quality indicator  
0= fix not available or invalid  
Longitude - E/W  
1= GPS SPS mode, fix valid  
Latitude - N/S  
2= differential GPS, SPS mode, fix valid  
3= GPS PPS mode, fix valid  
UTC of position *1  
*1: Not used  
4= Real Time Kinematic. Satellite system  
used in RTK mode with fixed integers  
5= Float RTK. Satellite system used in RTK  
mode with floating integers  
6= Estimated (dead reckoning) mode  
7= Manual input mode  
8= Simulator mode  
-9.4-  
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GLL - Geographic position - latitude/longitude  
Latitude and longitude of vessel position, time of position fix and status.  
Mode indicator (See note on page 9.3.) *1  
$--GLL, 1111.11, a, yyyyy.yy, a, hhmmss.ss, A,a*hh<CR><LF>  
Checksum  
Status (A = data valid V = data invalid)  
UTC of position *2  
Longitude, E/W  
Latitude, N/S  
*1: Eidition 2 only, *2: Not used  
MWV - Wind speed and angle  
When the reference field is set to relative, data is provided giving the wind angle in relation to the vessel’s  
heading and wind speed, both relative to the moving vessel.  
When the reference field is set to true, data is provided giving the wind angle relative to the vessel’s  
heading and wind speed, both with reference to the moving water. True wind is the vector sum of the  
relative apparent wind vector and the vessel’s velocity vector along the heading line of the vessel. If  
represents the wind at the vessel if it were stationary relative to the water and heading in the same direction.  
$--MWV, x.x, a, x.x, a, A*hh<CR><LF>  
Checksum  
Status (A = data valid V = data invalid)  
Wind speed unit (K/M/N)  
Wind speed  
Reference, R = relative  
T = true  
Wind angle (0° to 359°)  
-9.5-  
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RMA - Recommended minimum specific LORAN-C data  
Position, course and speed data provided by a LORAN-C receiver. Time differences A and B are those used  
in computing latitude/longitude. Checksum is mandatory in this sentence. This sentence is transmitted at  
intervals not exceeding 2 s and is always accompanied by RMB when a destination waypoint is active. RMA  
and RMB are the recommended minimum data to be provided by a LORAN-C receiver. All data fields must  
be provided, null fields used only when data is temporarily unavailable.  
Checksum, mandatory for RMA  
Magnetic variation (000.0 - 179.9°), degrees E/W *2  
Bearing, degrees *2  
Speed over ground, knots 2*  
Time difference B, 2*  
(00000.0 - 99999.9 µs)  
Time difference A, *2  
(00000.0 - 99999.9 µs)  
$--RMA, A, 1111.11, a, yyyyy.yy, a, x.x, x.x, x.x, x.x, x.x, a,a*hh<CR><LF>  
Mode indicator (See note on page 9.3.) *1  
Longitude, degrees, E/W  
Latitude, degrees, N/S  
Status (A = data valid, V = blink, cycle or SNR warning)  
*1: Edition 2 only, *2: Not used  
RMB - Recommended minimum navigation information  
Navigation data from present position to a destination waypoint provided by a LORAN-C, TRANSIT,  
OMEGA, GPS, DECCA, navigation computer or other integrated navigation system. Checksum is  
mandatory in this sentence. This sentence always accompanies RMA or RMC sentences when a destination  
is active when provided by a LORAN-C, TRANSIT or GPS receiver, other systems may transmit $--RMB  
without $--RMA or $--RMC.  
Checksum, mandatory for RMB  
Arrival status: A = arrival circle entered or perpendicular passed *2  
Destination closing velocity, knots *2  
Bearing to destination, degrees true  
Range to destination, nautical miles  
Waypoint longitude, E/W  
$--RMB, A, x.x, a, c--c, c--c, 1111.11, a, yyyyy.yy, a, x.x, x.x, x.x, A,a*hh<CR><LF>  
Mode indicator (See note on page  
9.3.) *1  
Waypoint latitude, N/S  
Destination waypoint ID  
Origin waypoint ID*2  
Direction to steer, (L = Port R = Starboard) *2  
Cross track error , nautical miles *2  
Status (A = data valid V = navigation receiver warning)  
*1: Eidition 2 only, *2: Not used  
-9.6-  
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RMC - Recommended specific GPS/TRANSIT data  
Time, date, position, course and speed data provided by a GPS or TRANSIT navigation receiver.  
Checksum is mandatory in this sentence. This sentence is transmitted at intervals not exceeding 2 s and is  
always accompanied by RMB when a destination waypoint is active. RMC and RMB are the recommended  
minimum data to be provided by a GPS or TRANSIT receiver. All data fields must be provided, null fields  
used only when data is temporarily unavailable.  
Checksum, mandatory for RMC  
Magnetic variation (000.0 - 180.0°), degrees E/W *2  
Date: dd/mm/yy *2  
Course over ground, degrees*2  
$--RMC, hhmmss.ss, A, 1111.11, a, yyyyy.yy, a, x.x, x.x, xxxxxx, x.x, a,a*hh<CR><LF>  
Mode indicator (See note on page  
9.3.) *1  
Speed over ground, knots*2  
Longitude, E/W  
Latitude, N/S  
Receive status (V = navigation receiver warning)  
UTC of position fix *2  
*1: Eidition 2 only, *2: Not used  
RTE - Routes  
Waypoint identifiers, listed in order with starting waypoint first, for the identified route. Two modes of  
transmission are provided: “c” indicates that the complete list of waypoints in the route is being transmitted;  
“w” indicates a working route where the first listed waypoint is always the last waypoint that had been  
reached (FROM), while the second listed waypoint is always the waypoint that the vessel is currently  
heading for (TO), the remaining list of waypoints represents the remainder of the route.  
$--RTE, x.x, x.x, a, c--c, c--c, ...... c--c*hh<CR><LF>  
Checksum  
Waypoint “n” identifier  
Waypoint “1” identifier  
Route identifier  
Message mode (C = complete route, W = working route)  
Message number  
Total number of messages being transmitted  
-9.7-  
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VDR - Set and drift  
The direction towards which a current flows (set) and speed (drift) of current.  
$--VDR, x.x, T, x.x, M, x.x, N *hh<CR><LF>  
Checksum  
Current speed, knots  
Direction, degrees magnetic *1  
Direction, degrees true  
*1: Not used  
WPL - Waypoint location  
Latitude and longitude of specified waypoint  
$--WPL, 1111.11, a, yyyyy.yy, a, c--c*hh<CR><LF>  
Checksum  
Waypoint number  
Waypoint longitude, E/W  
Waypoint latitude, N/S  
ZDA - Time and date  
UTC, day, month, year and local time zone.  
$--ZDA, hhmmss.ss, xx, xx, xxxx, xx, xx*hh<CR><LF>  
Checksum  
Local zone description, minutes *1  
Local zone description, hours *1  
Year  
Month, 01 to 12  
Day, 01 to 31  
UTC  
*1: Not used  
VTG – Course over ground and ground speed (R-type only)  
The actual course and speed relative to the ground.  
$--VTG, x.x, T, x.x, M, x.x, N, x.x, K,a *hh<CR><LF>  
Mode indicator (See note on page 9.3.) *1  
Speed over ground, km/h  
Speed over ground, knots  
Course over ground, degrees magnetic  
Course over ground, degrees true  
*1: Eidition 2 only  
-9.8-  
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Channel 1 output  
RAOSD - Own ship data  
$RAOSD,x.x,A,x.x,a,x.x,a,x.x,x.x,a*hh<CR><LF>  
Checksum  
Speed units, K/N/S (N-type only)  
Vessel set (degrees true), drift (speed)  
Vessel speed (See below)  
Vessel course (degrees true), Course reference (See below)  
Heading (degrees true), Heading status (A = data valid, V = data invalid)  
Reference systems (speed course)  
B: Botom tracking log  
M: Manully entered  
W: Water referenced  
R: Radar tracking (of fixed target)  
P: Positing system ground reference  
RARSD - Radar system data  
$RARSD,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,a,a*hh<CR><LF>  
Checksum  
Display rotation (C = course-up), H = head-up,  
N = north-up)  
Range units (K = km, N = nautical miles, S = statute  
miles) (N-type only)  
Range scale in use (0.125 - 120 nautical miles)  
Cursor range and bearing from own ship (0.000 - 999.9  
nautical miles, 0.0 - 359.9°)  
Bearing line 2 (EBL2) (0.0 - 359.9°)  
Variable range marker 2 range (VRM2) (0.000 - 999.9 nautical miles)  
Origin 2 range and bearing from own ship (0.000 - 999.9 nautical miles,  
0.0 - 359.9°)  
Bearing line 1 (EBL1) (0.0 - 359.9°)  
Variable range marker 1 range (VRM1) (0.000 - 999.9 nautical miles)  
Origin 1 range and bearing from own ship (0.000 - 999.9 nautical miles, 0.0 - 359.9°)  
-9.9-  
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Channel 2 input  
VBW - Dual ground/water speed  
$--VBW,x.x,x.x,A,x.x,x.x,A,x.x,A,x.x,A*hh<CR><LF>  
Checksum  
Status: stern ground speed *1  
Stern transverse ground speed (knots) *1  
Status: stern water speed *1  
Stern transverse water speed (knots) *1  
Speed status (A = data valid, V = data invalid)  
Transverse ground speed (knots)  
Longitudinal ground speed (knots)  
Status (A = data valid, V = data invalid)  
Transverse water speed (knots)  
Longitudinal water speed (knots)  
Priority N>km  
*1: Edition 2 only  
VHW - Water speed and heading  
The compass heading to which the vessel points and the speed of the vessel relative to the water.  
$--VHW, x.x, T, x.x, M, x.x, N, x.x, K *hh<CR><LF>  
Checksum  
Water speed, K = km/h  
Water speed, knots  
Priority: N>K  
Heading (M = magnetic bearing)*1  
Heading (T = true bearing)*1  
*1: Not used  
HDT  
$HDT,x.x,T*hh<CR><LF>  
Checksum  
Heading, degrees true  
-9.10-  
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Channel 3 output  
RATTM - Tracked target message  
$RATTM,xx,x.x,x.x,a,x.x,x.x,a,x.x,x.x,a,c---c,a,a,hhmmss.ss,a*hh<CR><LF>  
Checksum  
Type of acquisition (A/M/R) *1  
Time of data (UTC)*2  
Reference target = R, null otherwise  
Target status  
User data (e.g., target name) *2  
Speed/distance unit (K/N/S) (N-type only)  
Time to CPA (0-99.9 min)  
CPA (00.00-99.99 nm)  
Target course (degrees), true/relative (T/R)  
Target speed  
Bearing from own ship (degrees), true/relative (T/R)  
Target distance from own ship  
Target number (00 to 99)  
*1: Edition 2 only, *2: Not used  
-9.11-  
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Chapter 10 Parts List And Major Parts Location  
1
FR-2105 series DISPLAY UNIT RDP-124  
FR-2105-B series PROCESSOR UNIT, CONTROL UNIT AND MONITOR  
F U R U N O  
Model  
Unit  
FR-2105 Series/FR-2105-B Series  
Display Unit RDP-124, Processor Unit RPU-011  
電 気 部 品 表  
ELECTRICAL PARTS LIST  
99年     11月  
M onitor RDP-124-M-ES, Control Unit RCU-011  
Page  
Ref.Dwg.  
Blk.No.  
E-1  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回 路 記 号  
型 式  
コード番 号  
備 考  
出 荷 単 位 組 品  
PRINTED CIRCUIT BOARD  
03P9252, INT  
03P9253, SPU  
03P9254, PAL  
03P9255, PNL  
03P6256, PAR  
HV9017A, HV  
HV9017B, HV  
プ リ ン ト 基 板  
008-487-550  
008-487-500  
008-487-570  
008-487-600  
008-487-580  
008-481-630  
008-481-640  
1B7  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
1B8  
1B9  
1B10  
1B11  
1B13  
FR-2115/2115-B  
FR-2125/2125-B  
U4  
64P1106A, GC  
004-412-220  
008-473-650  
008-487-640  
008-487-660  
008-487-620  
OPTION  
OPTION  
OPTION  
OPTION  
OPTION  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
U5  
18P9002B, ARP  
14P0298, RP  
U6  
U6  
14P0299, CARD I/F  
03P9225, PM-IN  
U18  
CRT ASSY. PARTS  
IRF19634G, MOS FET  
2SC5301-YB, TR  
CRT 組 品 部 品  
000-790-215  
000-790-216  
000-790-217  
000-790-218  
000-790-219  
000-790-220  
000-790-221  
000-790-222  
000-790-223  
000-790-224  
000-790-255  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
      ◯  
PCF18-01, FB TR  
PBH172, MAIN PCB  
PBH173, VIDEO PCB  
PBH163, SW PCB  
PBH183, RELAY PCB  
PBH182, CRT SOCKET PCB  
PBH207, CONNECTOR PCB  
IF3-A10, PCB  
M51LEQ180, CRT  
CRT ASSEMBLY  
CRT 組 品  
1B15  
CDT2136B, PDM9025  
008-487-360  
      ◯  
PANEL ASSEMBLY  
操 作 部 組 品  
PAL/PAR/PNL/TB301  
008-487-370  
008-487-390  
Japanese  
English  
      ◯  
      ◯  
POWER BLOCK ASSY.  
03P9245A, PTU  
03P9245C, PTU  
03P9245D, PTU  
03P9245F, PTU  
電 源 組 品  
1B3  
008-487-430  
008-487-890  
008-487-900  
008-487-920  
100/115VAC, 24rpm  
100/115VAC, 42rpm  
220VAC, 24rpm  
      ◯  
      ◯  
      ◯  
      ◯  
220VAC, 42rpm  
-10.1-  
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E-2  
Page  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号  
型式  
コード番号  
備考  
出荷単位組品  
POWER BLOCK ASSY.  
03P9246A, PTU  
03P9246C, PTU  
電源組品  
1B4  
1B5  
008-487-440  
008-493-700  
For DC, 24rpm  
For DC, 42rpm  
   ◯  
   ◯  
FILTER ASSY.  
RPU-011  
フィルター組品  
008-487-470  
008-487-480  
008-492-460  
For 100/115VAC  
For 220VAC  
For DC  
RPU-011  
RDP-124  
   ◯  
   ◯  
COOLING FAN  
ファンモーター  
B1, B2  
F1, F2  
MMS-06C24DS-R01  
000-128-409  
w/cable  
FUSE  
ヒューズ  
FGBO 5A AC250V  
FGBO 10A AC125V  
FGB0 20A AC125V  
FGBO 0.5A AC125V  
000-549-022  
000-549-065  
000-549-015  
000-549-060  
For 220VAC spec  
For 100VAC spec  
For DC spec  
F1  
F3  
For DC spec  
FILTER  
フィルター  
FL1  
LF-210  
000-588-410  
SWITCH  
S-331  
スイッチ  
S1  
000-474-214  
000-140-814  
S2  
LB-26WKS1  
CABLE ASSEMBY  
UL2464SB20P/1P  
03-1918(6P)  
ケーブル組品  
000-140-813  
008-487-000  
008-486-940  
008-487-010  
008-487-040  
008-487-020  
008-487-050  
008-487-030  
008-487-060  
008-486-970  
008-486-960  
008-487-070  
008-486-980  
008-486-930  
008-487-080  
008-487-090  
W1  
P467-TB2  
03-1912(6P)  
P101-fuse  
03-1919(3-3P)  
03-1922(3-P3P)  
03-1920(9-9P)  
03-1923(P7-3,3P)  
03-1921(10-10P)  
03-1924(4-P2,P2P)  
03-1915(3-3P)  
03-1914(5-4P)  
03-1925(P9-6,5P)  
03-1916(6-14P)  
03-1909(15-15P)  
03-1926(SW-6P)  
03-1927(6-6P)  
P107-P481  
P102-P583  
P103-P415  
P104-P582  
P105-P413  
P106-P121,P122  
P401-P411  
P446-P7(GC)  
P466,P462-P581  
P465-P1(GC)  
P418-P560  
S2-P315  
P711(TB)-P311  
-10.2-  
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2
FR-2115/2125/2115-B/2125-B SCANNER UNIT RSB-0074/0075  
FURUNO  
Model  
Unit  
FR-2115/2125/2115-B/2125-B  
空中線部  
RSB-0074/0075  
電気部品表  
ELECTRICAL PARTS LIST  
98  5月  
SCANNER UNIT  
Ref.Dwg.  
Blk.No.  
Page  
E-3  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
PRINTED CIRCUIT BOARD  
コード番号  
備考  
出荷単位組品  
プリント基板  
008-487-260  
008-487-280  
008-487-300  
008-487-320  
008-487-240  
008-487-230  
008-312-370  
2B2  
03P9243A, RFC  
03P9243B, RFC  
03P9244A, MD  
03P9244B, MD  
03P9232, IF  
03P9242, TB  
MP-3795  
FR-2115  
FR-2125  
FR-2115  
FR-2125  
2B3  
2B4  
2B6  
2B7  
SCANNER CHASSIS  
RSB-0074  
空中線筐体部  
008-488-010  
008-488-030  
24rpm, w/o RF module  
42rpm, w/o RF module  
RSB-0075  
RF MODULE  
RTR-062  
RFジュール  
008-487-160  
008-490-680  
008-487-170  
Except Japan 本を除く  
Japan only 本のみ  
RTR-063A  
RTR-063  
MIC AEEMBLY  
RU-9253  
MIC品  
U801  
008-487-350  
008-487-340  
RTR-063  
RTR-062  
RU-9371  
MOTOR  
モーター  
B801  
D8G-516  
000-631-715  
000-136-566  
000-140-764  
24rpm, w/capacitor  
42rpm, w/capacitor  
25kW, w/cable  
D8G-571  
B802  
109P0824H602  
SWITCH  
スイッチ  
S901  
RS-1 NO  
000-478-301  
DIODE  
ダイオード  
CR870  
HVR-1X-40B  
MD-12N1  
000-121-156  
000-133-735  
000-121-156  
FR-2115  
FR-2125  
CR871  
HVR-1X-40B  
DIODE LIMITER  
RU-9099  
ダイオードリミッター  
CR880  
000-126-369  
CIRCULATOR  
RC-3686  
サーキュレータ  
HY801  
000-106-850  
-10.3-  
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Page  
E-4  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号  
型式  
コード番号  
抵抗  
備考  
出荷単位組品  
RESISTOR  
ERF-10HMJ102  
R899  
000-123-395  
TRANSFORMER  
RT-9025  
トランス  
T801  
000-123-823  
000-123-394  
FR-2115  
FR-2125  
RT-9023  
MAGNETRON  
MG5241  
E3566  
マグネトロン  
000-100-036  
000-141-073  
000-140-762  
V801  
FR-2115 Except Japan 日本を除く  
FR-2115 Japan only 日本のみ  
FR-2125  
MG5436  
CABLE ASSEMBY  
03-1903(2-R2P)  
03-1904(13-13P)  
ケーブル組品  
008-486-910  
008-486-920  
W1  
W2  
-10.4-  
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3
FR-2135SW/2135SW-B SCANNER UNIT RSB-0027/0032  
FURUNO  
Model  
Unit  
FR-2135SW/2135SW-B  
空中線部  
RSB-0027/0032  
SCANNER UNIT  
電気部品表  
ELECTRICAL PARTS LIST  
99年 1月  
Ref.Dwg. C3312-E02-D  
Page  
Blk.No.  
E-5  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
PRINTED CIRCUIT BOARD  
コード番号  
備考  
出荷単位組品  
プリント基板  
008-256-330  
008-243-530  
008-243-540  
1B2  
1B3  
MP-7302  
MSS-7497  
MSS-7497A  
220/200VAC  
440/380VAC  
MOTOR  
モーター  
B801  
RM-7398  
RM-7435  
000-113-840-02  
000-114-399-03  
DIODE  
ダイオード  
CR3001  
BCR-16C10R  
000-132-186  
DEICER  
HEATER  
ヒーター  
HR3001  
NDO-50040, 60W  
NDO-50040, 60W  
000-633-409  
000-633-409  
DEICER  
DEICER  
HR3002  
RESISTOR  
抵抗  
R3004  
ERD-25PJ221  
000-330-341  
DEICER  
SWITCH  
スイッチ  
S801  
S802  
S3001  
RS-1, NO  
ATK21-W  
000-478-301  
000-479-243  
000-478-160  
TR-8B50-PDS2  
DEICER  
ENCODER  
集積回路  
U801  
RSB-0026/0031-2/3  
008-256-320  
RE20F-120-100-B  
-10.5-  
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4
FR-2135SW/2135SW-B TRANSCEIVER UNIT RTR-047  
FURUNO  
Model  
Unit  
FR-2135SW/2135SW-B  
送受信部 RTR-047  
TRANSCEIVER UNIT  
電気部品表  
ELECTRICAL PARTS LIST  
99 1月  
Ref.Dwg. C3408-K01-A  
Page  
Blk.No.  
E-6  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
PRINTED CIRCUIT BOARD  
コード番号  
備考  
出荷単位組品  
プリント基板  
008-470-800  
008-470-830  
008-470-850  
008-465-450  
008-465-480  
008-465-780  
008-465-730  
3B3  
3B4  
3B5  
3B6  
03P9189,INT  
RFC-9008E,RFC  
MD-9009A,MD  
PTU-9185A,PTU  
PTU-9185B,PTU  
IF-9007,IF  
AC100/115V  
AC220/230V  
3B7  
3B8/9/10/11 MIC/ATT-7362  
MIC,TR Limiter  
MOTOR  
モーター  
B801  
MMS-06C12DS-R02  
000-128-408  
FAN  
CAPACITOR  
コンデンサ  
C890  
ECQ-V1H104JLW  
000-129-101  
DIODE  
ダイオード  
000-133-735  
000-133-735  
CR871  
MD-12N1  
MD-12N1  
CR870  
FUSE  
ヒューズ  
F801  
FGBO 0.5A, AC125V  
FGBO-A 2A, AC125V  
000-549-060  
000-549-062  
F802  
FILTER  
フィルタ  
FL801  
HY801  
Q808  
R889  
V801  
J810  
LF-205A  
000-588-411  
CIRCULATOR  
サーキュレータ  
RC-4910S  
000-126-346  
TRANSISTOR  
トランジスタ  
2SB1259  
000-116-180  
RESISTOR  
抵抗  
ERF-10HMJ102  
000-123-395  
MAGNETRON  
MG5223F  
マグネトロン  
000-109-081  
JACK  
ジャック  
WF3003E  
000-158-022  
-10.6-  
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Page  
E
                                                                           
-
                                                                            
7
                                                                             
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
TRANSFORMER  
コード番号  
備考  
出荷単位組品  
トランス  
T801  
RT-9273  
000-136-734  
CABLE w/CONNECTOR  
03-1034(6P)  
03-1831(3P)  
03-1839(2P)  
03-1840(2P)  
03-1838(3P)  
コネクタ付ケーブル  
008-242-870  
008-465-510  
008-465-600  
008-465-610  
008-465-590  
NH Connetor  
VH Connetor  
VH Connetor  
VH Connetor  
VH Connetor  
-10.7-  
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5
FR-2125W/2125W-B SCANNER UNIT RSB-0076/77/78  
FURUNO  
Model  
Unit  
FR-2125W/2125W-B  
空中線部  
RSB-0076/77/78  
電気部品表  
ELECTRICAL PARTS LIST  
SCANNER UNIT  
Ref.Dwg. C3333-K01-E  
Page  
99  1月  
Blk.No.  
E-8  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
PRINTED CIRCUIT BOARD  
コード番号  
備考  
出荷単位組品  
プリント基板  
008-391-430  
008-391-450  
008-391-420  
008-500-090  
2B3  
2B4  
2B5  
2B6  
MP-8161,MP  
BP-8162,BP  
MPT-8226,MPT  
03P9263,DE-ICER  
For MOTOR  
OPTION  
MOTOR  
モーター  
B801  
RM-8123  
RM-8124  
RM-8247  
000-117-822  
000-117-823  
000-117-824  
200/220VAC,3φ:RSB-0076  
380/440VAC,3φ:RSB-0077  
100VAC,:RSB-0078  
SWITCH  
スイッチ  
S801  
S802  
S3001  
RS-1 NO  
000-478-301  
000-478-301  
000-478-160  
ATK21-W  
TR-8B50PDS2  
DIODE  
ダイオード  
CR3001  
BCR-16C10RS  
000-141-122  
RESISTOR  
抵抗  
R3004  
ERD-25PJ221  
000-330-341  
-10.8-  
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6
FR-2125W/2125W-B TRANSCEIVER UNIT RTR-046  
FURUNO  
Model  
Unit  
FR-2125W/2125W-B  
送受信部  
RTR-046  
電気部品表  
ELECTRICAL PARTS LIST  
99 1月  
TRANSCEIVER UNIT  
Ref.Dwg. C3405-K01-B  
Page  
Blk.No.  
E-9  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
PRINTED CIRCUIT BOARD  
RF  
コード番号  
備考  
出荷単位組品  
プリント基板  
008-465-420  
008-470-800  
008-470-820  
008-470-840  
008-465-450  
008-465-480  
008-465-490  
008-465-470  
3B3  
3B5  
3B6  
3B7  
3B8  
03P9189,INT  
RFC-9008D,RFC  
MD-9009,MD  
PTU-9185A,PTU  
PTU-9185B,PTU  
IF-9007,IF  
AC100/115V  
AC220/230V  
3B9  
3B10  
MIC-6550,MIC  
MIC,TR Limiter  
MOTOR  
モーター  
B801  
MMS-08C24DH-R  
000-128-410  
CAPACITOR  
コンデンサ  
C890  
ECQ-V1H104JLW  
000-129-101  
DIODE  
ダイオード  
000-133-735  
000-133-735  
CR871  
MD-12N1  
MD-12N1  
CR870  
FUSE  
ヒューズ  
F801  
FGBO 0.5A, AC125V  
FGBO-A 2A, AC125V  
000-549-060  
000-549-062  
F802  
FILTER  
フィルタ  
FL801  
HY801  
J810  
LF-205A  
000-588-411  
CIRCULATOR  
RC-3686  
サーキュレータ  
000-106-850  
JACK  
ジャック  
WF3003E  
000-518-022  
TRANSISTOR  
トランジスタ  
Q808  
2SB1259  
000-116-180  
RESISTOR  
抵抗  
R889  
ERF-10HMJ102  
000-123-395  
-10.9-  
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Page  
                                                                            
                                                                            
                                                                             
                                                                             
                 
                 
                                                                               
                                                                               
E-10  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
TRANSFORMER  
コード番号  
備考  
出荷単位組品  
トランス  
T801  
V801  
CR880  
RT-9023  
000-123-394  
MAGNETRON  
マグネトロン  
M5187F  
000-101-760  
TR LIMITER  
RU-9290  
TRミッタ  
000-136-735  
-10.10-  
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7
FR-2155/2155-B SCANNER UNIT RSB-0049/0050  
FURUNO  
Model  
Unit  
FR-2155/2155-B  
空中線部  
RSB-0049/0050  
電気部品表  
ELECTRICAL PARTS LIST  
98年  12月  
SCANNER UNIT  
Ref.Dwg. C3353-K03-D  
Blk.No.  
Page  
E-11  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
PRINTED CIRCUIT BOARD  
コード番号  
備考  
出荷単位組品  
プリント基板  
008-312-370  
008-415-220  
008-256-140  
008-415-190  
008-415-200  
008-414-650  
008-415-210  
2B2  
2B4  
2B5  
2B6  
2B7  
2B8  
2B9  
MP-3795,MP  
03P666C,RTB  
03P6668,PFN.1.  
03P6669B,PFN2  
03P6827B,MAG  
IF6734C  
03P9004,INT  
SCANNER CHASSIS  
RSB-0049-N  
空中線筐体部  
008-414-310  
008-414-320  
008-414-340  
008-414-340  
24 VDC  
24 VDC  
220 VAC  
220 VAC  
RSB-0049-I  
RSB-0050-N  
RSB-0050-I  
RF MODULE  
RTR-030  
RFモジュール  
008-414-520  
2B3  
MIC ASSEMBLY  
RTR-030  
MIC 組品  
008-415-270  
MIC-6550, S-RX24  
MOTOR  
モーター  
B801  
G0B-8222  
RM-6585  
MU1025S-11  
109-180  
000-123-333-01 220 VAC (RSB-0049)  
000-106-770  
000-116-647  
000-105-416  
24 VDC (RSB-0050)  
B802  
B803  
SWITCH  
スイッチ  
S801  
RS-1 NO  
ATK 21W  
000-478-301  
000-479-243  
S802  
DIODE LIMITER  
ダイオードリミッター  
CR810  
HY801  
T801  
BS-4122/E3902  
000-116-043  
CIRCULATOR  
RC-3686  
サーキュレータ  
000-106-850  
TRANSFORMER  
RT-9028  
トランス  
000-123-335  
-10.11-  
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Page  
                                                                           
                                                                           
                                                                            
                                                                            
                
                
                                                                              
                                                                              
E-12  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
MAGNETRON  
コード番号  
備考  
出荷単位組品  
マグネトロン  
000-106-012  
V801  
M4505E  
CABLE ASSEMBY  
ケーブル組品  
008-414-450  
008-414-440  
008-414-430  
03-1451 (P2P)  
ML CONNECTOR  
03-1450 (FAN-R3P)  
03-1449 (SW-2P)  
M-ML CONNECTOR  
S-NH CONNECTOR  
RELAY  
リレー  
K801  
K802  
K803  
VF-12HU-UL  
VF-12HU-UL  
VF-12HU-UL  
000-108-676  
000-108-676  
000-108-676  
DIODE  
DIODE  
CR803  
CR804  
CR804  
CR813  
CR814  
CR815  
V19E-AB2  
V19E-AB2  
V19E-AB2  
SH16J12U  
SH16J12U  
SH16J12U  
000-136-019  
000-136-019  
000-136-019  
000-135-165  
000-135-165  
000-135-165  
COIL  
コイル  
U801  
RL-9029  
000-123-334  
-10.12-  
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8
FR-2135S/2135S-B SCANNER UNIT RSB-0026/0031/0088/0089/0090  
電気部品表  
ELECTRICAL PARTS LIST  
SCANNER UNIT  
Ref.Dwg. C3469-K01-B  
Page  
98年 11月  
Blk.No.  
E-13  
SYMBOL TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
PRINTED CIRCUIT BOARD  
コード番号  
備考  
出荷単位組品  
プリント基板  
008-488-220  
008-488-230  
008-488-240  
008-487-230  
008-256-330  
008-243-530  
008-243-540  
1B2  
1B3  
1B4  
1B6  
1B7  
1B8  
03P9243D, RFC  
03P9244C, MD  
03P9232A, IF  
03P9242, TB  
MP-7302  
X
X
X
X
X
X
MSS-7497  
200/220VAC  
380/440VAC  
MSS-7497A  
ASSEMBLY  
組品  
RSB-0026/31-066  
RSB-0026/31-066  
RSB-0026/31-066  
008-491-530  
008-491-580  
008-493-020  
AMP/MIC  
X
X
X
U801  
MIC RU-9427  
TR CHASSIS, RFC, MD  
SCANNER CHASSIS  
RSB-0026-066-N  
RSB-0026-066-I  
空中線筐体部  
008-493-470  
008-493-480  
008-493-490  
008-493-500  
008-493-510  
008-493-520  
008-493-530  
008-493-540  
008-525-300  
008-525-400  
008-525-050  
008-525-060  
008-525-070  
008-525-080  
X
X
X
X
X
X
X
X
RSB-0026-066-N-HK  
RSB-0026-066-I-HK  
RSB-0031-066-N  
RSB-0031-066-I  
RSB-0031-066-N-HK  
RSB-0031-066-I-HK  
RSB-0088-066-N  
RSB-0088-066-I  
RSB-0089-066-N  
RSB-0089-066-I  
RSB-0090-066-N  
RSB-0090-066-I  
MOTOR  
モーター  
B801  
B802  
RM-7398  
RM-7435  
RM-9519  
RM-9520  
RM-9521  
109E1224M102  
000-113-840  
000-114-399  
000-144-850  
000-144-851  
000-144-852  
000-109-412  
200/220VAC  
440/380VAC  
220VAC, 3Φ, 50Hz  
220VAC, 3Φ, 60Hz  
440VAC, 3Φ, 60Hz  
-10.13-  
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Page  
E-14  
SYMBOL TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
回路記号 型式  
コード番号  
備考  
出荷単位組品  
CAPACITOR  
コンデンサ  
000-129-260  
C890  
Q15  
ECQ-V1H104JL3  
TRANSISTOR  
トランジスタ  
2SB946P  
000-133-053  
DIODE  
ダイオード  
CR870  
CR871  
CR880  
MD-12N1  
HVR-1X-40B  
RU-9426  
000-133-735  
000-121-156  
000-141-060  
000-132-186  
DIODE LIMITTER  
DEICER  
CR3001 BCR-16C10R  
HEATER  
ヒーター  
HR3001 NDO-50040, 60W  
HR3002 NDO-50040, 60W  
000-633-409  
000-633-409  
DEICER  
DEICER  
RESISTOR  
抵抗  
R899  
1K/10  
000-123-823  
000-330-341  
R3004  
ERD-25PJ221  
DEICER  
SWITCH  
スイッチ  
S801  
S802  
S3001  
RS01, NO  
ATK21-W  
000-478-301  
000-479-243  
000-478-160  
TR-8B50-PDS2  
DEICER  
TRANSFORMER  
トランス  
T801  
HY801  
V801  
U802  
RT-9273  
000-136-734  
PULSE TRANS.  
CIRCULATOR  
サーキュレータ  
RC-6584S  
000-126-345  
MAGNETRON  
マグネトロン  
MG5223F  
000-109-081  
ROTARY ENCODER  
ロータリーエンコーダ  
RE20F-120-100-B  
000-113-271  
w/CONNECTOR ASSY.  
03-1967(P2P)  
コネクタ組品  
008-491-450  
008-491-420  
008-491-470  
008-491-430  
008-491-470  
03-1965(3P)  
03-1969(6P)  
03-4966(13-13P)  
03-1969(6P)  
-10.14-  
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9
FR-2135S/2135SW/2135S-B/2135SW-B POWER SUPPLY UNIT PSU-004  
FURUNO  
Model  
Unit  
FR-2135S/2135SW/2135S-B/2135SW-B  
電源制御部 PSU-004  
電気部品 表  
ELECTRICAL PARTS LIST  
98  11月  
POWER SUPPLY UNIT  
Ref.Dwg. C3385-K01-D  
Page  
Blk.No.  
E-14  
SYMBOL  
TYPE  
CODE No.  
REMARKS  
SHIPPABLE  
ASSEMBLY  
記 号 型 式  
PRINTED CIRCUIT BOARD  
コード番 号  
備 考  
単 位組 品  
ン ト基 板  
008-451-750  
B2  
03P9146  
FUSE  
ー ズ  
F1, F2  
FGBO 10A AC125V  
FGBO 2A AC250W  
000-549-065  
000-549-020  
F3  
RELAY  
ー  
K1  
HG3-DC12V  
000-454-822  
000-137-509  
000-137-508  
000-454-755  
K2  
TR-0NH/3, 1.7A  
TR-0NH/3, 0.8A  
SP2-DC12V  
For RSB-0026/0088/0089  
For RSB-0031/0090  
K3  
-10.15-  
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DISPLAY UNIT, TOP VIEW and BOTTOM VIEW  
CRT  
CDT2136B  
PDM board  
PDM9025  
Main board  
for CRT  
Display Unit (Rear view, CRT block lifred)  
PTU board  
03P9245  
Noise Filter  
MB board  
03P9251  
HV board  
HV9017  
INT board  
03P9252  
GC board  
64P1106  
RP board  
14P0298  
SPU board  
03P9253  
ARP board  
18P9002  
-10.16-  
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TRACKBALL  
EUA-FTF814B  
PNL board  
03P9255  
PAR board  
03P9256  
RUBBER KEY-R  
03-144-1652  
RUBBER KEY  
03-144-1651  
PAL board  
03P9254  
EXPLODED VIEW OF DISPLAY UNIT CONTROL HEAD  
-10.17-  
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FR-2115/2125/2115-B/2125-B ANTENNA UNIT, SCANNER OUTLINE and RF MODULE  
S901  
TB board  
03P9242  
RF module  
Scanner Unit  
IF board  
03P9232  
MIC assy  
RU-9253 for RTR-063  
RU-9371 for RTR-062  
Diode limiter  
RU-9099  
RFC board  
03P9243  
T R - 0 6 * * * K W  
R
RF module, top view  
-10.18-  
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View Point "A"  
FAN MOTOR ASSY  
03-1900  
C
B
J811  
J812  
A
PULSE TRANSFORMER  
RT-9025 for RTR-062  
RT-9023 for RTR-063  
4
6
MAGNETRON  
MG5241 for RTR-062 (12 kW, X)  
MG5436 for RTR-063 (25 kW, X)  
View Point "A"  
RF MODULE  
A magnetron has strong magnetism. Do not bring a ferrous material in close contact with  
it. Do not place the magnetron on a steel table.  
For further information on parts location and how to replace components, refer to the Service  
Manual which will be available at extra cost.  
-10.19-  
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FR-2125W/2125W-B TRANSCEIVER UNIT  
Checkmeter SW  
M801 S840  
Fuse  
F802  
Hourmeter  
HM801  
Fuse  
F801  
Overcurrent Lamp  
CR51  
Registor  
R811, R812  
P801  
P601  
J651  
Transceiver module  
PTU pcb  
PTU-9185A (110-115 VAC)  
PTU-9185B (220-230 VAC)  
Checkmeter pcb  
(CM-5146)  
Terminal TB806  
Filter FL801  
Terminal RTB-2  
Outlet  
J806  
Terminal  
Transformer  
T804  
-10.20-  
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TR Limiter  
(RU-9290)  
IF Amp  
MIC  
(S-RX24)  
J601  
J801  
Circulator  
(RC-3686)  
Triger  
(RFC-9008)  
Pulse Transformer T801  
Leed wire for Magnetron  
SCR  
CR813, CR814  
Magnetron  
(M5187F)  
FAN  
B802  
MD-9009, pcb  
-10.21-  
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FR-2125W/2125W-B SCANNER UNIT  
Heater for de-ice  
(option)  
Scanner motor  
B801  
Motor switch  
S802  
De-icer temperature senser  
(option)  
Right Side  
HL switch  
CR3001  
STB-3  
STB-2  
STB-1  
MP-8161 pcb  
BP-8162 pcb  
Left Side  
-10.22-  
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HL switch  
STB-3  
MPT-8226 pcb  
MP-8161 pcb  
STB-2  
STB-1  
BP-8162 pcb  
Left Side  
-10.23-  
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FR-2135SW/2135SW-B TRANSCEIVER UNIT  
Modulation board  
MD-9009  
Magnetron  
MG5223F  
MOD TRIGGER  
board  
RFC-9008  
Pluse Transformer  
RT9273  
RTR-047 Transformer unit  
Fuse  
0.5A  
Fuse  
2A  
Power supply  
PTU-9185  
FILTER  
LF-205A  
Terminal board  
-10. 24-  
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Diode limiter  
RU-8715  
MIC  
MIC-6681  
RTR-047 Transformer unit  
IF amp  
IF-9007  
Door switch  
Ventilation for (Behind)  
Diode limiter  
RU-8715  
Diode limiter  
RU-7394  
ATT board  
ATT-7362  
Circulator  
RC4910S  
RTR-047 Transformer unit  
-10. 25-  
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FR-2135SW/2135SW-B SCANNER UNIT  
Rotary encoder  
U801  
Antenna motor  
B801  
Scanner Unit (left side)  
MP-7302 pcb  
MSS-7497 pcb  
Terminal Board  
STB1  
Scanner Unit (right side)  
-10. 26-  
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FR-2155/2155-B SCANNER UNIT  
Safty switch  
S802  
MP-3795 pcb  
Terminal board  
STB-3  
De-ice sensor  
(Option)  
Terminal board  
STB-1  
Motor  
B801  
Gland  
(2-A30, 1-A25)  
Terminal board  
STB-2  
Gear  
RF module  
RTR-030  
-10. 27-  
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RTB pcb  
(C03P6666)  
MIC  
Pulse  
transformer  
IF Amp pcb  
(C IF-6734)  
Relay pcb  
(03P9004)  
RF module RTR-030  
Magnetron pcb  
(B 03P6827)  
PFN.1. pcb  
(03P6668)  
PFN.2. pcb  
(03P6669)  
Magnetron  
9M31/M4505E  
RF module RTR-030  
-10. 28-  
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FR-2165DS SCANNER UNIT  
TB STB-2  
TB STB-3  
MIC  
IF AMP  
03P6570  
J/P910  
J/P601  
TB STB-1  
Left side  
RF module  
J829  
R812  
R811  
MD pcb  
Magnetron  
RTB pcb  
[C]03P6666  
Relay pcb  
[A]03P9004  
Pulse transformer  
T801  
CR808/809  
Right side  
-10. 29-  
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FAN motor  
B802  
[A]MP-3795 pcb  
Magnetron  
V801  
Scanner motor  
B801  
Scanner Unit (righ side)  
[A]03P6827 pcb  
J821  
Pulse transformer  
T801  
Choke coil  
L801  
Thyristor CR815  
Thyristor CR814  
Thyristor CR813  
Relay  
K801-K803  
MD pcb  
03P6668  
PFN pcb  
[c]03P6669  
RF module  
-10. 30-  
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FR-2135S/2135S-B SCANNER UNIT  
RSB-0026 RM-7398 200/220 VAC 3φ 50/60 Hz  
RSB-0031 RM-7435 380/440 VAC 3φ 50/60 Hz  
RSB-0088 RM-9519 220 VAC 3φ 50 Hz  
RSB-0089 RM-9520 220 VAC 3φ 60 Hz  
RSB-0090 RM-9521 440 VAC 3φ 60 Hz  
-10. 31-  
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SIMPLIFIED INTERCONNECTION DIAGRAM  
(See Installation Manual for terminal connections)  
RW-4873  
(25C + 2C2V)  
RJ-7 INTERSWITCH  
EXTERNAL SIG IN  
J457  
J458  
DJ1 (MB)  
TB801  
ANTENNA SCANNER  
CHANNEL 1 PORT  
OUT: OWN SHIP DATA  
INPUT: GLL  
J450  
(Channel1)  
TB1  
SHIP'S MAINS  
CHANNEL 2 PORT  
INPUT:  
SDME (VBW)  
GYRO (HDT)  
GYRO CONV  
GC-8  
J455  
(Channel 2)  
IF-2300  
GYROCOMPASS  
OR  
GYRO CONVERTER  
J446  
CHANNEL 3 OUTPUT for  
ARPA (TTM)  
J454  
J448  
J444  
SDME (speed pulse)  
03P9  
(Optional)  
J472  
J473  
J474  
EXT ALARM  
Radar Video, Trigger, Azimuth,  
HDG for EXT ARPA (TTM)  
J475  
J442  
SLAVE DISPLAY  
Interface  
optional  
J449  
VDR (RGB video)  
J443  
SLAVE DISPLAY  
03P9225  
(Optional)  
Not used  
J453  
J456  
J402  
J403  
P. MONITOR  
BUZZER  
RS 232C  
(ALTERNATIVE TO  
RS 422 AT J450)  
J452  
J463  
J445  
+12V, +5V  
SPARE  
Note: The FR-2105/2105-B series radar does not process the IEC61162-2 data.  
Therefore, the system may only work as HSC radar by receiving data of gyrocompass  
data thru GC-8 or AD-100.  
-10. 32-  
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RF Module RTR-062: 12 kW  
RF Module RTR-063: 25 kW  
03P9242 (TB)  
TB801  
TO  
RADIATOR  
P911  
P912  
P811  
JB11  
JB12  
J911  
J912  
P821 J821  
P801  
T801  
P813  
P814  
J813  
J814  
V801  
Magnetron  
J802 P802  
P812  
J801  
HY801  
Circulator  
RC-3686  
C890  
0.1  
03P9243 (RFC)  
A: 12 kW  
B: 25 kW  
03P9244 (MD)  
A: 12 kW  
B: 25 kW  
CR870  
CR871  
MVR-IX-408  
J915  
R899  
1k/10  
CR880  
RU-9099  
DIODE  
LIMITER  
J803  
P803  
M
B892  
SCANNER  
MOTOR  
P611  
P913  
J913  
J611  
U801  
MIC MODULE  
P612  
J612  
03P9232 (IF)  
J902  
J914 P914  
P901 J901  
P902  
S901  
MP-3795  
B801  
24 rpm: D8G-516  
42 rpm: D8G-571  
M
C911  
0.47  
ANTENNA UNIT  
SCHEMATIC DIAGRAM  
(For more detail, refer to installation manual or service manual.)  
-10. 33-  
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