Lowrance electronic Portable Radio LVR 850 User Manual

Pub. 988-0158-001  
LVR-850  
DSC VHF Marine Radio  
Installation and Operation  
Instructions  
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Table of Contents  
Section 1: Installation ..............................................................1  
Introduction .................................................................................. 1  
Powering Your Radio ................................................................ 1  
Auxiliary Wires ......................................................................... 1  
Bracket Installation.................................................................. 2  
Antenna......................................................................................... 3  
How to Make a Distress Call........................................................ 4  
Section 2: Basic Radio Operation ..........................................5  
Using the Keypad ......................................................................... 5  
Power/Volume ........................................................................... 6  
Squelch ...................................................................................... 6  
H/L (High/Low) ......................................................................... 6  
WX (Weather)............................................................................ 6  
16/9 (Priority Channel)............................................................. 6  
SCN (Scan) ................................................................................ 6  
MEM (Memory)......................................................................... 7  
CALL ......................................................................................... 7  
DISTRESS................................................................................. 7  
Arrow Keys................................................................................ 7  
PTT (Press to Talk)................................................................... 7  
DSC Calling vs. non-DSC Calling................................................ 7  
What is a DSC call? .................................................................. 7  
How DSC works ........................................................................ 8  
Simplex or Duplex..................................................................... 8  
MMSI (Maritime Mobile Service Identity) .................................. 8  
MMSI Setup .............................................................................. 9  
Choosing a Channel.................................................................... 10  
Making a Call.............................................................................. 10  
Receiving a Call .......................................................................... 11  
Section 3: Advanced Operation............................................13  
Calls......................................................................................... 13  
Transmission........................................................................... 13  
AllShips Call........................................................................ 13  
Directory Call...................................................................... 14  
Distress Call........................................................................ 14  
Last Call .............................................................................. 16  
New Call .............................................................................. 16  
Reception................................................................................. 18  
AllShips Call........................................................................ 18  
Distress Call........................................................................ 18  
Geographic Call................................................................... 18  
Individual Call .................................................................... 19  
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Channels.................................................................................. 19  
Channel Bank ......................................................................... 19  
Directory.................................................................................. 20  
Storing/Editing MMSI Data ............................................... 20  
DSC Monitor ........................................................................... 21  
GPS Operation ........................................................................ 22  
H/L........................................................................................... 22  
Memory Operation.................................................................. 22  
Position Send/Request ............................................................ 23  
Transmission....................................................................... 23  
Reception ............................................................................. 24  
Priority Channel (16/9)........................................................... 25  
PTT (Push To Talk)................................................................. 25  
Scan ......................................................................................... 25  
Weather (Wx) .......................................................................... 27  
Frequency Charts & Usage ...................................................28  
FCC Radio License and MMSI Number Information  
In U.S. waters, vessels which are not required to carry radio equipment  
are not required to have an FCC (Federal Communications Commis-  
sion) ship station license for a VHF marine radio.  
However, any vessel required to carry a marine radio on an interna-  
tional voyage, carrying a HF single side band radio telephone or marine  
satellite terminal must have an FCC license.  
License application forms for ship and land stations can be downloaded  
free from the FCC web site at this address: www.fcc.gov/formpage.html.  
You may also order copies of these forms by calling the FCC Forms Dis-  
tribution Center at 1-800-418-3676.  
At this time, the FCC does not require recreational boaters to have a  
ship radio station call sign. The U.S. Coast Guard recommends using  
the boat's registration number and state.  
The BoatU.S. MMSI Program has been certified by both the Federal  
Communications Commission (FCC) and the U.S. Coast Guard to as-  
sign MMSI numbers to vessels with DSC capable radios. To obtain and  
register your free MMSI number, the Coast Guard recommends logging  
onto http://www.boatus.com/mmsi/ and following the instructions.  
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FCC Digital Device Compliance  
This device complies with Part 15 of the U.S. Federal Communi-  
cations Commission (FCC) Rules. Operation is subject to the fol-  
lowing two conditions: (1) this device may not cause harmful in-  
terference, and (2) this device must accept any interference re-  
ceived, including interference that may cause undesired opera-  
tion.  
Changes or modifications not expressly approved by the manu-  
facturer could void the user's authority to operate the equip-  
ment.  
Note:  
This equipment has been tested and found to comply with the  
limits for a Class B digital device, pursuant to Part 15 of the  
FCC Rules. These limits are designed to provide reasonable pro-  
tection against harmful interference in a residential installation.  
This equipment generates, uses and can radiate radio frequency  
energy and, if not installed and used in accordance with the in-  
structions, may cause harmful interference to radio communica-  
tions. However, there is no guarantee that interference will not  
occur in a particular installation. If this equipment does cause  
harmful interference to radio or television reception, which can  
be determined by turning the equipment off and on, the user is  
encouraged to try to correct the interference by one or more of  
the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
Connect the equipment into an outlet on a circuit different from  
that to which the receiver is connected.  
Consult the factory customer service department for help.  
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FCC Radio Frequency  
Compliance Requirements and Warnings  
When operating your marine radio transceiver, you should know that  
the antenna radiates radio frequency (RF) energy. This radio was de-  
signed to meet the FCC’s rules and regulations for the maximum per-  
missible exposure to radio frequency energy. This design was tested  
and found to be compliant with the strict requirements established by  
the FCC.  
DO NOT operate the radio without a proper antenna attached, because  
this may damage the radio and may also cause you to exceed FCC RF  
exposure limits. Antenna types suited for this radio are described in the  
installation section.  
DO NOT transmit for more than 50% of the total radio use time.  
Transmitting more than 50% of the time can cause FCC RF exposure  
compliance requirements to be exceeded. The radio is transmitting  
when the “TX indicator” is displayed on the screen. You can cause the  
radio to transmit by pressing the "PTT" (Push To Talk) switch.  
IMPORTANT: The antenna(s) used for this transmitter must be in-  
stalled to provide a separation distance of at least 91 cm (37 inches)  
from all persons (including passengers). The antenna(s) must not ex-  
ceed an antenna gain of 3 decibels (dB) and must not be co-located or  
operating in conjunction with any other antenna or transmitter.  
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Section 1: Installation  
Introduction  
Thank you for purchasing the Lowrance LVR 850 DSC VHF Radio. We  
know you’re anxious to try it out, but first, let us explain how this  
manual can help you get the most out of your new radio.  
We have designed this book so you don’t have to read the whole thing  
from front to back to find the information you want. At the start of each  
segment, we’ll tell you what content is coming up next. If it’s a concept  
you're already familiar with, we’ll show you where to find the next im-  
portant topic.  
We lead off the manual with proper Distress Call procedures on page 4.  
We put it at the front of the book to make it easy to find in case of an  
emergency.  
The first section covers LVR-850 installation and specifications.  
The second section, Basic Radio Operation, goes over some basic func-  
tions of the radio and includes instructions on how to set up your MMSI  
(Maritime Mobile Service Identity) number. You can't make a call  
without it! To jump to MMSI setup, flip to page 8. To acquire a  
free MMSI number, see the web address on the bottom of page  
ii.  
The third section, Advanced Radio Operation, offers more detailed in-  
formation about the radio's features. The section will touch on all as-  
pects of the radio's functionality, providing clear and complete explana-  
tions via a convenient alphabetical layout.  
Let’s get started!  
Powering Your Radio  
(Power Supply cable – red and black wires)  
The unit works from a 12-volt electrical system. You may attach the  
radio to a 12-volt battery or to an auxiliary power panel.  
If possible, keep the power cable away from other boat wiring, especially  
the engine's wires. This will provide the best isolation from electrical  
noise. The power cable has two wires, red and black. Red is the positive  
lead, black is negative or ground. Make sure to attach the in-line fuse  
holder to the red lead as close to the power source as possible.  
Auxiliary Wires  
The white and black auxiliary wires on the back of the unit connect  
your radio to an external speaker. Connect the white (+) wire to the  
speaker's positive lead, and connect the black (–) wire to the speaker's  
negative lead.  
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The remaining auxiliary wires are used for DSC (Digital Selective  
Calling) service, where the radio can exchange latitude and longitude  
position information with a GPS (Global Positioning System) receiver  
in NMEA 0183 format.  
Receive +  
NMEA Transmit + (Orange)  
Ground – (Yellow)  
To GPS unit  
Shield – (Ground)  
To Radio  
Wiring to transmit NMEA information  
to a GPS receiver.  
NMEA Receive + (Brown)  
Transmit +  
To GPS unit  
To Radio  
Ground – (Red)  
Shield (Ground)  
Wiring to receive NMEA position information  
from a GPS receiver.  
Caution  
All of the auxiliary wires have bare ends for easier installation.  
The bare ends on any unused wires could cause an electrical  
short if left exposed. To prevent this, you should cover the indi-  
vidual wire ends – either by capping them with wire nuts or  
wrapping them with electrical tape.  
Bracket Installation  
Mount the unit in any convenient location, provided there is clearance  
behind the unit when it's tilted for the best viewing angle. You should  
also make sure there is enough room behind the unit to attach the  
power, antenna and auxiliary cables. Pick a location far enough from  
any compass to avoid compass deviation caused by the speaker magnet.  
The radio must be installed at least three feet from the antenna. Make  
sure there is space nearby to hang the mic clip.  
Holes in the gimbal bracket's base allow wood screw or through-bolt  
mounting. You may need to place a piece of plywood on the back side of  
thin fiberglass panels to reinforce the panel and secure the mounting  
hardware. We suggest that you use stainless steel screws for installa-  
tion.  
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Screw  
mounting  
hole  
Front  
Install the gimbal bracket, which looks similar to the one pictured  
here. Place the bracket so the arms slope toward the radio's front.  
Once a location is determined, use the bracket as a template and mark  
the mounting holes. Screw the bracket to the mounting surface. Be sure  
to leave enough slack in the cables to allow tilting the unit.  
Attach the unit to the gimbal bracket using the supplied gimbal knobs  
and washers. Attach the cables and the unit is ready to use.  
Antenna  
A good antenna installation will optimize the performance of your ma-  
rine radio. There is no height requirement for antenna installation, but  
the higher it is mounted, the better the reception. That's because ma-  
rine VHF radio signals travel only on a "line of sight" basis. An ideal  
installation will give the antenna a clear view of the horizon in all di-  
rections.  
The antenna may be mounted on a gunwale, rail or on flat surfaces like  
a deck, roof or bulkhead. In the case of some sailboats and powerboats,  
it may be attached to a mast or mast-like structure.  
When installing your VHF marine antenna, be sure to keep it at least  
three feet away from any other antenna or metal object. The antenna  
also must be installed three feet away from the radio, and at least three  
feet from any passengers or crew. Refer to the antenna manufacturer's  
instructions for further installation information. You must also make  
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sure your antenna and its installation complies with all local and fed-  
eral regulations. Never operate your radio unless it is connected to the  
antenna.  
The antenna must not exceed an antenna gain of 3 decibels (dB). The  
antenna cable requires a PL259 connector, and the cable connects at  
the back of the radio. For installations less than 25 feet, use RG58 co-  
axial cable. For installations greater than 25 feet, use RG-8/U coaxial  
cable.  
WARNINGS:  
Using an antenna with gain greater then 3 dB can dam-  
age the radio and exceed the safe exposure limits for ra-  
dio frequency (RF) energy.  
Also, the energy from any VHF radio antenna can be  
harmful, even one properly rated at 3 dB of gain! Do not  
come in contact with the antenna while a transmission is  
being sent. Be sure the antenna is installed where it is  
separated from people by at least 3 feet of space.  
How to Make a Distress Call  
Speak slowly, clearly and calmly.  
1. Select VHF Channel 16.  
2. Press microphone button: "MAYDAY — MAYDAY— MAYDAY."  
3. "THIS IS [your ship ID]."  
4. "MAYDAY [your ship name]."  
5. Tell where you are what navigational aids or landmarks are near.  
6. State the nature of your distress.  
7. Give number of persons aboard and condition of any injured.  
8. Estimate present seaworthiness of your ship.  
9. Briefly describe your ship meters, type, color, hull.  
10. "I WILL BE LISTENING ON CHANNEL 16."  
11. End message by saying "THIS IS [ship name/call sign] OVER."  
12. Release the PTT key and listen. Someone should answer. If not, re-  
peat call, beginning at Item 3 above.  
WARNING  
The following types of communication are prohibited by  
the FCC: false distress calls; calls to any boat — exclud-  
ing emergencies and radio tests; calls to or from a vessel  
on land and obscene or profane language. Using obscene  
or profane language could result in a fine of up to  
$10,000.  
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Section 2: Basic Radio Operation  
This section addresses the radio’s basic operations, which includes  
MMSI (Maritime Mobile Service Identity) number setup. If you already  
have your MMSI number programmed into the radio and have a strong  
understanding of the radio's basic functions, move on to Section 3:  
Advanced Radio Operation.  
The Lowrance LVR-850 VHF  
Marine Radio.  
We're going to kick off the operation section with a brief description of  
the radio's basic functions. That will be followed by some important in-  
formation on Digital Selective Calling and basic instructions on how to  
make and receive calls.  
Using the Keypad  
The keypad has eight keys: H/L (Hi/Lo), WX (Weather), 16/9 (Priority  
Channels), SCN (Scan), MEM (Memory), CALL (Call) and ↑ ↓, the up-and-  
down arrow keys. When you press any of the keys a tone will sound. If  
you push a key and a 3-beep tone sounds, there is an error or the func-  
tion is not supported by the radio. You’ll notice several functions re-  
quire you to hold down a key for a few seconds. In those cases, a single  
beep sounds, then, after a few moments, a second beep will be heard to  
let you know you have successfully changed the mode.  
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Power/Volume  
The volume knob at the top right of the radio’s face is used to power up  
the LVR 850. Turn the knob clockwise to turn on the radio. The unit  
will start on Ch. 2, then switch to Ch. 16, its default priority channel.  
Squelch  
Squelch, the bottom knob on the radio’s face, helps the unit screen out  
radio traffic resulting from signals that are too weak to transmit any-  
thing but noise. To adjust the squelch, turn it to the left until noise can  
be heard. Turn it back to the right until the noise is eliminated.  
DSC  
Monitor  
Memory Annunciator  
Arrow  
Keys  
Channel  
ID  
Annunciator  
USA  
Channel  
Bank  
Character  
field position  
H/L (High/Low)  
The H/L key gives you control over the radio's wattage. The high-end is  
25 Watts. The low-end is 1 Watt. If the LO ANNUNCIATOR is off, the radio  
will transmit at 25 Watts.  
WX (Weather)  
Dark clouds on the horizon? Press the WX key to enter the WX (WEATHER)  
MODE and get the latest weather information. Use the ↑ ↓ keys to change  
the WX channel.  
16/9 (Priority Channel)  
The 16/9 key is used to switch between priority channels. It also allows  
you to exit various operation modes, ignore incoming calls and cancel  
outgoing calls.  
NOTE  
Ch. 16 and Ch. 9 may only be used to make initial contact with a  
vessel and nothing more. When there is an emergency, all Distress  
calls will be broadcast on Ch. 16.  
SCN (Scan)  
The SCN (scan) key allows you to monitor numerous channels at the  
same time. Scanning options include: PRIORITY SCAN, MEMORY SCAN AND  
ALLSCAN.  
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MEM (Memory)  
The MEM key may be used to initiate a Memory Scan and gives you the  
option of adding or deleting channels from the radio's scan list memory.  
CALL  
By pressing the CALL key you can make a new call, return the last in-  
coming call, place a call to all ships or to one of up to 10 stored MMSI  
numbers from a saved directory.  
DISTRESS  
By lifting up the red cover and holding down the DISTRESS button for  
three seconds, you will send a distress call to the Coast Guard and any  
other ship within range of you.  
Arrow Keys  
Use the ↑ ↓ keys to scroll through the channels and various menu op-  
tions.  
PTT (Press to Talk)  
The PTT key is the talk button on the microphone. Press and hold it  
down to talk when making or receiving a call.  
DSC Calling vs. non-DSC Calling  
The LVR-850 supports two types of calls, Digital Selective Calls (DSC)  
and non-Digital Selective Calls. A non-DSC call is the traditional  
method where an individual hails another vessel on Ch. 16, then asks  
the other party to switch to a working channel set aside for the desired  
communication type. Once they have left Ch. 16 and the selected  
working channel is clear, the individual hails the vessel again to initi-  
ate communication.  
What is a DSC call?  
A relatively new technology, digital selective calling (DSC) gives you  
the capability to dial another boat directly via the vessel's MMSI (Mari-  
time Mobile Service Identity) number, which functions much like a  
phone number. Digital Selective Calling simplifies the calling process,  
because you don't have to hail the vessel on Ch. 16 nor do you have to  
verbally direct them to the working channel you want them to switch to  
for communication. When their DSC radio receives your call, it auto-  
matically will switch to the channel you selected for communication.  
The primary reason DSC was created was to enhance boater safety. It  
does this in several ways. When working in tandem with a GPS unit, it  
helps the Coast Guard respond more quickly to a Distress Call, since  
the location of the vessel in distress will be automatically transmitted  
when the signal is sent out. It will automatically repeat a distress sig-  
nal every four minutes. That would come in handy if, as in the case of a  
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fire, you could not man the radio and fight the fire at the same time.  
DSC calling also helps cut back the transmission traffic on Ch. 16, the  
emergency priority channel.  
How DSC works  
A digital selective call uses a digital signal to transmit a pack of infor-  
mation that can include, the caller’s MMSI number, the MMSI of the  
ship or ships being called, call priority and a frequency or mode re-  
quest. Location and time of location may be entered manually or if an  
active GPS unit is attached, transmitted automatically. DSC calls allow  
you to contact a specific ship, a group of ships, a specific group of DSC  
receivers, ships in a particular geographic area or all ships within  
range of you. A DSC call may even be patched into a regular phone line  
through a commercial coastal station. One of the key elements of a DSC  
call is the ability to place an individual call directly to another vessel.  
Simplex or Duplex  
References to simplex and duplex channels are scattered throughout  
this manual. Simplex channels transmit and receive messages on the  
same frequency. Like a CB radio, only one message can be transmitted  
at a time. A duplex channel transmits and receives messages on differ-  
ent frequencies. Like a telephone, it gives users the capability to  
transmit and receive messages at the same time. You must choose a  
simplex channel when making a DSC call!  
MMSI (Maritime Mobile Service Identity)  
Your Maritime Mobile Service Identity number (MMSI) is like a home  
phone number. Other DSC (Digital Selective Calling) radios must enter  
your number before they can contact you. But first, you must program  
your number into your radio. If your MMSI number is not set up, the ID  
ANNUNCIATOR will blink on the display.  
CAUTION  
You only have one chance to program your MMSI into your ra-  
dio. Study this section carefully to ensure the MMSI is entered  
correctly.  
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The figure above illustrates the MMSI number entry of 992344513.  
If a valid MMSI is already stored in the radio's memory, you will not be  
able to enter a MMSI number. If a 9-digit MMSI number has not been  
programmed into the radio, you will not be able to make or receive DSC  
calls. To enter your assigned MMSI number, follow the steps listed in  
the MMSI Setup below.  
Warning  
Again, there is only one chance to do this procedure cor-  
rectly, so go over this section carefully.  
MMSI Setup  
1. Hold down the CALL key for 5 seconds. The ID ANNUNCIATOR will blink  
and a large "0" will be displayed alongside a small “16.” The big number  
“0” is the MMSI digit you are entering and the small digit “16” is the  
first MMSI character field position. For example, a small digit "2" rep-  
resents the 2nd number from the left in your assigned MMSI. If the  
number was "4" it would mean the big digit you were entering was the  
4th number from the left and so on.  
This example gives us a closer look at a number sequence from a MMSI  
entry. The big numbers are the MMSI digits. The small numbers in the  
lower right hand corner represent the digits' character field position.  
The big digit 4 is the sixth number from left in the MMSI. The big digit  
5 is seventh from left and the big digit 1 is eighth from left.  
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NOTE  
You need only to modify the big (MMSI) digits. The small digits  
(character field position of the MMSI digit) will be generated auto-  
matically.  
2. Use the ↑ ↓ keys to enter the first digit of your MMSI number, then  
press the MEM key to advance to the second digit. The small digit now  
displays the 2nd character position with a big-digit "0" and small-digit  
"2”. Press the ↑ ↓ keys to set the second MMSI digit and touch the MEM  
key to store. Repeat the operation until all 9 digits have been entered.  
After inputting your MMSI, press the MEM key to double-check each  
digit.  
NOTE  
If there is an error in the entry procedure, press the 16/9 key to exit.  
You can also turn off the radio to ensure the MMSI won't be stored.  
After you are satisfied with the MMSI number you have entered, hold  
down the CALL key for 5 seconds to store the number. The ID ANNUCIATOR  
will stop blinking and the radio reverts to the main screen. Now you are  
ready to make a DSC call.  
Choosing a Channel  
Before making a call to another vessel, check the VHF chart in the back  
of this manual. You'll have to choose a simplex communication channel  
authorized for the type of communication you desire.  
Making a Call  
The LVR-850 supports five DSC call types: ALLSHIPS CALL, DIRECTORY CALL,  
LAST CALL, NEW CALL and DISTRESS CALL. The example below details a NEW  
CALL. For information on the other call types, see page 13.  
To place a DSC call  
New Call  
1. Select a simplex channel and press the CALL key once. LAST blinks.  
2. Use the ↑ ↓ keys to select NEW CALL.  
3. Press the CALL key again. You can now enter the MMSI data of the  
vessel you want to contact.  
4. Use the ↑ ↓ keys to enter the MMSI numbers, pressing MEM after  
each digit. After completing MMSI entry, press the MEM key to verify  
each number of the MMSI.  
5. Press the CALL key and the radio will transmit the request. If there  
is no ACK after 4 seconds, the radio transmits the call again. The radio  
will stay in standby mode until an ACK is received, indicated by the  
flashing ID Annunciator. If an ACK is not received, you can press the  
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call key again and the call is placed again. You can exit the call func-  
tion at any time by pressing the 16/9 key twice.  
CAUTION  
Before transmitting, monitor the selected simplex channel to make sure  
it is clear. This is a FCC requirement.  
NEW and ID will blink  
MMSI Digit  
Digit number  
Ch. 8 is  
simplex  
working  
channel  
For more in depth information on placing calls see page 13.  
To place a non-DSC call:  
When making a non-DSC call, you'll have to switch to a communication  
channel after making initial contact, so be sure to select a channel  
authorized for the type of communication you desire.  
1. Select an appropriate communication channel.  
2. Tune your radio to Ch. 16 or Ch. 9. Speak slowly and clearly, stating  
the name of the vessel you are trying to contact followed by "this is  
(your ship name and call sign)."  
3. When the other vessel responds, say "go to (the desired channel num-  
ber) over."  
4. Switch to the other working channel. After you are sure it is clear,  
call out to the other vessel, stating the vessel's name, followed by "this  
is (your ship name and call sign)."  
Receiving a Call  
Reception of an individual call automatically establishes communica-  
tion on the working channel requested by the caller. Your radio trans-  
mits an ACK (Acknowledgement) message back to the calling radio. If  
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the calling vessel’s MMSI matches a number stored in your directory,  
the number's directory location is shown. If no match is made, the ID  
ANNUNCIATOR blinks. If you want to respond to the calling vessel, just  
press the PTT button on the microphone. Press the 16/9 key to ignore  
the call. See page 18 to get more detailed information on call reception.  
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Section 3: Advanced Operation  
This section will give a more detailed explanation of what your radio  
can do. We'll start off with a breakdown of the types of DSC calls the  
LVR-850 can transmit and receive. That will be followed by a brief de-  
scription of how to place a non-DSC call. If you are comfortable with  
your knowledge regarding transmission and reception of calls, skip  
ahead to page 20 to see how to set up a MMSI Directory. On page 27,  
there is information on the radio's weather function.  
Calls  
Transmission  
The five DSC calling modes are:  
1. AllShips Call: places a call to any ship in range of you.  
2. Directory Call: dials number from MMSI directory.  
3. Distress Call: executes an emergency call to Coast Guard and other  
ships in range of you.  
3. Last Call: dials last incoming call.  
4. New Call: places call to caller not in the MMSI directory.  
Press CALL then use the ↑ ↓ keys to scroll through the four choices  
(DISTRESS CALL is a separate function, so it is not included in the calls  
menu). The LAST CALL option always appears first.  
Four call  
sources  
to use  
AllShips Call  
This feature gives you the option of placing a call to all ships within  
range of you.  
NOTE  
This radio does not handle AllShips urgency or safety DSC calls.  
AllShips  
calls use  
Ch. 6  
1. Press the CALL key.  
2. Use the ↑ ↓ keys to select ALLSHIP.  
3. Press the CALL key to transmit.  
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Directory Call  
See page 20 to learn how to setup a MMSI directory. To call a number  
from your directory:  
1. Use the ↑ ↓ keys to select a simplex-working channel.  
2. Press the CALL key.  
3.Use the ↑ ↓ keys to select the call type — DIR, LAST, NEW or ALL-  
SHIPS. Select DIR, then press CALL.  
4. Use the ↑ ↓ keys to choose a MMSI location number (1-10). The de-  
fault number is the MMSI of the last used call.  
5. Press the CALL key to transmit. The called radio will acknowledge