Uniden Marine Radio UM425 VHF DSC User Manual

UM425 VHF DSC

Marine Radio

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Making a distress call

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Table of Contents

Making a DSC DISTRESS Call.......................................................................................2

Making a voice distress call.........................................................................................2

Table of Contents ...................................................................................... 4 (this page)

Introduction.....................................................................................................................6

Features.......................................................................................................................6

Manual overview..........................................................................................................6

Conventions..............................................................................................................6

Terms used in this manual........................................................................................7

Getting Started................................................................................................................8

What's included.......................................................................................................................8

Parts of the radio.....................................................................................................................9

Turning on the radio..............................................................................................................12

Setting the UIC channel mode (USA/CAN/INT)..................................................................12

How It Works.................................................................................................................12

Normal mode operation.............................................................................................13

Using the radio in normal mode..............................................................................14

Normal mode with Triple and Dual Watch ..............................................................15

Scan mode.................................................................................................................16

Using the radio in scan mode.................................................................................16

Scan mode with Triple and Dual Watch..................................................................17

Using Your Radio..........................................................................................................18

Making a voice MAYDAY call.....................................................................................19

Setting the volume.....................................................................................................19

Setting the squelch level............................................................................................19

Changing the channel................................................................................................20

Making a transmission...............................................................................................20

Boosting the transmission power............................................................................20

Choosing Triple Watch or Dual Watch....................................................................21

Changing display and sound options.........................................................................22

Contrast..................................................................................................................22

Lamp adjust............................................................................................................22

Turning the key beep on and off.............................................................................22

Setting the GPS position manually............................................................................22

Using Digital Selective Calling (DSC) Features.........................................................24

What is DSC? ............................................................................................................24

Advanced DSC features............................................................................................24

Getting an MMSI number...........................................................................................25

Entering MMSI numbers............................................................................................25

Individual or user MMSI number.............................................................................25

Group MMSI number..............................................................................................26

Using the directory.....................................................................................................27

Making DSC calls ......................................................................................................29

Calling a single station (Individual Call)..................................................................30

Calling a particular group of stations (Group Call)..................................................31

Calling all stations (All-Ships Call) ............................................................................... 31

Making an automatic distress call............................................................................... 32

Canceling an automatic distress call ......................................................................32

Receiving a DSC call.................................................................................................33

Receive log................................................................................................................33

Returning a call.......................................................................................................34

Making a Test Call (Test) ...........................................................................................35

Receiving a test call................................................................................................36

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Table of Contents (Cont'd)

Enabling automatic test call reply...........................................................................36

Requesting another station's position (POS Request) ..............................................36

Receiving a position request (Position Reply)...........................................................37

Enabling automatic position reply...........................................................................37

Sending your own position (Position Send) ................................................................38

Putting the radio into standby......................................................................................38

Disabling automatic channel switching .......................................................................39

Renaming Channels.....................................................................................................40

Installing the Hardware................................................................................................41

Mounting the radio.....................................................................................................41

Connecting the radio..................................................................................................43

Connecting accessories.............................................................................................45

Connecting to a GPS receiver................................................................................45

Configuring the GPS...............................................................................................47

Connecting to a charplotter ....................................................................................48

Connecting to an external speaker.........................................................................48

Connecting to an external PA speaker ...................................................................49

Using the PA feature...............................................................................................50

Maintenance and Troubleshooting .............................................................................51

Common questions...............................................................................................................51

Engine Noise Suppression...................................................................................................53

Specifications...............................................................................................................54

Channel and frequencies......................................................................................................57

NMEA Operation...................................................................................................................63

NMEA Input........................................................................................................................63

NMEA Output.....................................................................................................................63

Regulations and Safety Warnings.........................................................................................64

Basic radio guidelines................................................................................................64

DSC: Frequently Asked Questions............................................................................64

Antenna Selection and Installation ............................................................................65

Two Year Limited Warranty..........................................................................................66

Mounting Bracket Template.........................................................................................67

List of Tables

Table 1 - Terms used in this manual ................................................................................7

Table 2 - Rear panel connector functions ........................................................................9

Table 3 - Front panel button functions............................................................................10

Table 4 - Microphone button functions........................................................................... 11

Table 5 - Normal mode status messages.......................................................................14

Table 6 - Character and text entry order ........................................................................28

Table 7 - Receive log .....................................................................................................34

Table 8 - Common GPS receivers and connections ......................................................46

Table 9 - Radio specifications ........................................................................................54

Table 10 - International Channel Frequencies and Channel Tag...................................57

Table 11 - USA Channel Frequencies and Channel Tag................................................59

Table 12 - Canadian Channel Frequencies and Channel Tag .......................................61

Table 13 - NMEA Input Parameters ...............................................................................63

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Introduction

Features

•

Watertight Radio Housing:

Meets the worldwide JIS6 water resistant speciﬁcation means it is able to

withstand powerful water jets without damage.

•

Rugged Waterproof Speaker Microphone:

With Channel Select, One-Touch 16/9 and Triple Watch Select Keys.

Meets the worldwide JIS7 waterproof speciﬁcations; submersible at 1.0

metre depth for 30 minutes.

•

Large, dot matrix display

Advanced DSC Class D functions, including Test Calling

Built-in PA output

Channel select buttons on the microphone

Memory scan mode

Lets you save channels to memory and monitor them in quick succession.

•

Transmitter Power Level Select

Lets you boost the transmitter power from 1 watt to 25 watts for added

transmission distance.

•

Battery level display and tone

Sounds an alert tone if the battery voltage goes too high or too low.

Triple Watch Operation

Checks the emergency channel 16 and channel 9 in the background.

All marine VHF channels for the International, U.S. and Canadian

waters

Manual overview

Conventions

This manual uses several different type styles to help you distinguish

between different parts of the radio:

•

BOLD SMALL CAPITALS indicates an actual button or knob on the radio

or microphone.

Upper and Lower case bold indicates a connector or label on the

radio.

Italics indicate text on the display, such as menu options, prompts,

and conﬁrmation messages.

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Introduction

Table 1 - Terms used in the manual

DSC

Digital Selective Calling. A VHF radio standard for

communicating among boats and sending automated

distress calls.

GPS

Global Positioning System

NMEA

National Marine Electronics Association. The

organization that governs standards for electronic

equipment used on boats. NMEA 0183 is the standard

for serial data communication used by GPS receivers.

MMSI

Maritime Mobile Service Identity number. A unique,

nine-digit number that identiﬁes you and your boat

when making DSC calls. It is also used by the Coast

Guard if you send an automated distress call.

Station Any DSC radio, whether it’s operated on a boat, at a

marina, or by a shore station.

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Getting Started

What's included

UM425 VHF

VHF DSC TRANSCEIVER

1 Watt

Memory

Scanning Channels

01,03,05,06,07,08

INT

UM425 Radio

DC Power Cable

Accessory Cable

Mounting Bracket and

knobs

Mounting Hardware

Spare Fuse 250V 6A

Microphone Hanger and

Mounting Hardware

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Getting Started

Parts of the radio

Antenna

connector

(SO238)

Accessory

connector

Heat sink

ANTENNA

13.8V DC

Power

connector

Table 2 - Rear panel connector functions

Connector

Connects to

For details, see

Antenna connector

External VHF antenna with

a male PL259 (SO238)

connector and 50 Ω

Connecting the radio,

page 44.

impedance.

Minimum 1.2m, 3dB rated

antenna for sailboats, 2.4m, 6

dB rated for power boats.

Power connector

Nominal 13.8 VDC power

supply with negative ground

(10.8 VDC to 15.6 VDC)

(Red wire +, black wire -).

Connecting the radio,

page 43.

Accessory connector GPS receiver, GPS

Connecting accessories,

chartplotter, external speaker, page 45.

external PA speaker.

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Getting Started

VOLUME-PWR

(power) knob

(turn clockwise

to increase

volume)

SELECT

button

LCD

display

CHANNEL UP

DOWN buttons

Microphone

cord

UM425 VHF

VHF DSC TRANSCEIVER

1 Watt

Memory

Scanning Channels

01,03,05,06,07,08

INT

1/25W

button

MENU-PA

(public

address)

button

SQUELCH knob

(turn clockwise

to decrease

16/9-^TRI

(triple/

dual-watch)

button

SCAN-MEM

DISTRESS

channel noise)

(channel

memory)

button

Table 3 - Front panel button functions

Button

Press to...

Press and hold to...

SELECT

Choose an option on a menu.

Move up one channel at a time.

CHANNEL UP

CHANNEL DOWN

16/9-TRI

Move quickly up the

channels.

Move down one channel at a time. Move quickly down the

channels.

press: Go to Channel 16.

press: Go to Channel 9.

press: Go back to the original

Go into Triple Watch or

Dual Watch mode (see

page 15).

channel.

DISTRESS

Select the nature of your distress

for a distress call.

Transmit a distress call.

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Getting Started

Button

Press to...

Press and hold to...

1/25W

Change the transmit power (see

page 20).

MENU-PA

Display the radio menu.

Use the public address

(PA) function.

SCAN-MEM

Start scanning the channels saved Save a channel into

in memory.

memory or remove a

channel from memory.

PUSH-

^TO-TALK

button

▲

(up) button

(move up a channel)

MIC

16 / 9

TRI

16/9 ^TRI

(Triple/Dual-

Watch) button

▼

(down) button

(move down a channel)

Table 4 - Microphone button functions

Button

Press to...

Press and hold to...

Move up one channel at a time.

Move quickly up the

channels.

▲

Move down one channel at a time. Move quickly down the

▼

channels.

16/9-TRI

press: Go to Channel 16.

press: Go to Channel 9.

press: Go back to the original

Go into Triple Watch or

Dual Watch mode (see

page 15).

channel.

PUSH TO TALK

Cancel scanning and stay on a

channel.

Talk on a channel.

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How It Works

Turning on the radio

Turn the VOLUME-PWR knob clockwise to turn on the radio. As it powers on,

the radio displays the user MMSI number; if there is no MMSI set, the radio

displays MMSI not entered.

When it powers on, the radio selects the last channel used.

Setting the UIC channel mode (USA/CAN/INT)

NOTE: This menu selection is hidden by default. To access this feature; Turn

▲

on the radio while holding down SCAN and

buttons. The feature will

be hidden again from the menu when power is turned off. The radio comes

preset to use the UIC channels assigned for International waters. If you are

operating in an area that uses Canadian or United States UIC channels, you

will need to change the channel mode.

Press the MENU-PA button to display the menu, and choose the Setup

sub-menu.

Select USA/CAN/INT. The screen displays the UIC channel setup.

Highlight the channel mode you want to use: US (USA mode),

Canadian (Canada mode), or international (Intl mode).

Press the SELECT button. The radio activates the new channel mode

and exits the menu.

How It Works

The UM425 has two basic modes of operation:

Operation mode What it does:

Use it when:

To turn it on/off:

(default mode)

Normal mode

Monitors a single

marine radio

You want to talk to

another station on a

speciﬁc channel.

channel and lets

you talk on that

channel.

Scan mode

Monitors all the

channels you save

into memory.

You have a small

group of channels

you use most often

and want to check

them for trafﬁc.

Press the SCAN-

MEM button.

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How It Works

In addition to the two main operation modes, the UM425 also provides two differ-

ent “watch” modes which you can activate during any of the two basic modes. In

the watch modes, the radio brieﬂy checks for activity on a speciﬁc channel, then

returns to its previous mode.

Watch mode

Triple Watch

What it does:

Use it when:

To turn it on/off:

Checks for activity

on channels 16

and 9 every two

seconds.

You want to monitor Press and hold the

a channel yet 16/9-TRI button for

maintain a watch on two seconds.

channels 16 and 9.

Dual Watch

Checks for activity

You want to monitor Change Triple

on channel 16 every a channel yet

Watch to Dual

two seconds. maintain a watch on Watch in the setup

channel 16.

menu, then press

and hold the 16/9-

TRI button for two

seconds.

NOTE: You are required to monitor channel 16 whenever your boat is under-

way. You should have either Triple Watch or Dual Watch on at all times.

Normal mode operation

Normal mode monitors whatever channel you select, and you can transmit on

that channel also.

While using normal mode, the display lets you see the following information

(not all indicators will display at the same time):

Channel mode

(USA, CANadian,

or INTernational)

Transmit power

(1 W or 25 W)

25 Watts INT

Memory

GPS Data OK

Current

channel

number

Current channel

is stored in

memory

Marine Operator

Current channel

name (if the name

is too long, the

Status messages

(see the status

message table)

name line scrolls)

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How It Works

Table 5 - Normal mode status messages

Message

GPS Data OK The radio is receiving valid GPS data.

Check GPS The radio is not receiving valid GPS data: check the GPS status screen and

Meaning

the GPS connection.

Input Position The radio has been unable to receive valid GPS data for at least four hours;

it can no longer track your position. You need to manually input your position

(see Setting the GPS position manually on page 22).

Battery Low

Battery High

Triple Watch

Dual Watch

The battery voltage output is too low (below 10.5 VDC).

The battery voltage output is too high (above 16.0 VDC).

Triple Watch is turned on.

Dual Watch is turned on.

Using the radio in normal mode

•

To transmit, press and hold the PUSH TO TALK button on the

microphone. Release the button when you are ﬁnished talking.

•

For the best sound quality, hold the microphone about two inches from

your mouth while you’re talking.

▲

button on the

•

Press the CHANNEL UP button on the radio or the

microphone to move up one channel at a time. Press and hold either

button to scroll quickly up the channels.

•

Press the CHANNEL DOWN button on the radio or the▼button on

the microphone to move down one channel at a time. Press and hold

either button to scroll quickly down the channels.

To change the transmit power, press the 1/25W button. The transmit

power switches between 1 watt and 25 watts each time you press the

1/25W button.

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How It Works

Normal mode with Triple and Dual Watch

If you activate Triple Watch while operating in normal mode, the radio checks

channels 16 and 9 every two seconds; with Dual Watch turned on, the radio

only checks channel 16. The radio will not check channels 16 or 9 while you

are actively transmitting; it waits until your transmission is ﬁnished and then

checks the channels.

Press and hold the 16/9-TRI button (on the radio or the microphone) for two

seconds to turn Triple/Dual Watch on or off. (To change between Triple or

Dual Watch, see page 21.)

Monitoring Channel 25

09 16

Every 2 seconds, the radio

checks channels 9 & 16.

with Triple Watch on

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How It Works

Scan mode

You can save channels into memory and then use scan mode to monitor

those channels. When the radio detects a signal on a channel, it pauses on

that channel as long as the signal is received; when the transmission stops,

the radio will continue scanning.

When it detects a signal, the radio stays on the

channel until you press the ^{CHANNEL UP}button or the

signal stops.

Resume scan

17 20

The radio scans about

5 channels in 1 second.

In scan mode, you can get the following information from the display (some

indicators will not always be displayed):

Channel mode

(USA, CANadian,

or INTernational)

Transmit power

last used

1 Watt

Memory

Scanning Channels

01,03,05,06,07,08

INT

Current

channel being

scanned

All scanned

channels must

be in memory

Scan list (if the

text is too long,

the line scrolls)

Normal scan

mode or Triple/

Dual-watch on

Using the radio in scan mode

•

You cannot transmit while in scan mode.

You must have two or more channels in memory to start a scan.

To save a channel into memory, select the channel, then press and

hold the SCAN-MEM button for two seconds. Memory will show on the

display.

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How It Works

•

To remove a channel from memory, set the radio to that channel, then

press and hold the SCAN-MEM button for two seconds. Memory will no

longer show on the display.

•

To activate scan mode, press the SCAN-MEM button. Press the SCAN-

MEM button again to return to the previous mode.

When the radio automatically stops on a channel, press the CHANNEL

UP button to leave that channel and resume scanning.

To end the scan, press the microphone PUSH TO TALK button or the

SCAN-MEM button. The radio remains on the last scanned channel.

Scan mode with Triple and Dual Watch

Press and hold the 16/9-TRI button (on

If you activate Triple Watch while

operating in scan mode, the radio

checks channels 16 and 9 every

two seconds, then goes on to

scan the next channel; with Dual

Watch turned on, the radio only

checks channel 16:

the radio or the microphone) for two

seconds to turn Triple/Dual Watch on or

off. (To change between Triple or Dual

Watch, see page 21.)

Memory Channel Scan

08 10 11 12 13 14 15 17 20 24 25

Every 2 seconds,

the radio checks

channels 9 & 16

then goes on to

09 16

the next channel.

with Triple Watch on

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Using Your Radio

To display the radio menu, press the MENU-PA button. The menu has the

following options:

Individual

Group

DSC Call SELECT

All Ships

POS Request

Position Send

Test

Directory

New

SELECT

JOHN

SELECT

Use the up & down arrows to

scroll through the alphabet

for each character.

Display the menu and choose the DSC Call sub-menu.

Select Directory. The screen displays any previously-entered MMSI

numbers and names.

To add a new MMSI number to the directory, select New.

The radio prompts you to enter the nine-digit MMSI number. Use the

CHANNEL UP and CHANNEL DOWN buttons to change the ﬁrst digit; the

CHANNEL UP button increases the number and the CHANNEL DOWN

button decreases the number.

When the ﬁrst digit is correct, press the SELECT button. The cursor

moves to the next digit. Enter the remaining eight digits of the MMSI

number in the same way.

When the ninth digit is correct, press the SELECT button.

The radio prompts you to enter a name for this MMSI number; the

name is what you will see in the directory list. Each name can be up

to 12 characters. Use the CHANNEL UP and CHANNEL DOWN buttons

to change the ﬁrst character. The channel buttons scroll through the

available characters according to the following table:

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Using Digital Selective Calling (DSC) Features

Table 6 - Character and text entry order

CHANNEL UP button

CHANNEL DOWN button

Capital letters (A through Z)

One blank space

Lower-case letters (a through z) Numbers (0 through 9)

Punctuation (/ ‘ + -)

Numbers (0 through 9)

One blank space

Punctuation (/ ‘ + -)

Lower-case letters (a through z)

Capital letters (A through Z)

When the ﬁrst character is correct, press the SELECT button. The cursor

moves to the next character. Enter the remaining 11 characters of

the name. If the name is shorter than 12 characters, press and hold

the SELECT button to complete the name entry. (If you press and hold

the SELECT button without entering a name, the radio uses the MMSI

number in the directory list.)

When you ﬁnish entering the name, the radio displays the new MMSI

number and name and asks you to conﬁrm. To save this directory

entry, select Yes; to cancel this directory entry, select No. The radio

returns to the directory list.

10. To change an existing directory entry, select the entry you want to

change.

11.

To delete the directory entry, select Delete. To edit the code, select

Edit, then use CHANNEL UP and CHANNEL DOWN buttons to edit the

MMSI number and the name.

12. When you are satisﬁed with the directory list, select Exit to close the

menu screen.

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Using Digital Selective Calling (DSC) Features

Making DSC Calls

There are essentially four different types of DSC voice calls:

Call type

What it does

When to use it

Distress

Alerts all stations that you need

assistance and sends them your

current position.

In an emergency only.

Individual

Group

Calls a single station using the

User MMSI.

Any time you want to talk to

another station.

Calls all the stations that have the Any time you want to talk with

same Group MMSI as yours.

the whole group you are traveling

with at the same time.

All ships

Calls all stations in range of your Safety warnings (e.g., debris

radio.

in the water) or an urgency

situation.

For examples of how you might use different call types, see the diagram

below:

All ships call

(dotted circles)

Group

call

Individual

call

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Using Digital Selective Calling (DSC) Features

Suppose you are coordinating safety for a sailboat race. Before the race

starts, you instruct all the racers to enter your group MMSI number into their

radios. During the race:

•

Throughout the race, you use group calling to update the racers on the

time, race status, and any course corrections.

•

A power boat full of spectators comes a little too close to the race path.

You use individual calling to contact the power boat and advise them to

stay clear of the race.

•

You see a rowboat entering the area, but since it doesn’t have a radio,

you can’t communicate with the rowboat. You use all ships calling to

alert all the other boats in the area of the possible danger.

Calling a single station (Individual Call)

To call a single station with DSC, follow the steps below:

Press the MENU-PA button to display the menu.

Choose the DSC Call sub-menu, then select Individual.

The radio displays the names listed in your directory; use CHANNEL UP

and CHANNEL DOWN buttons to highlight the directory entry you want to

call and press the SELECT button.

If you want to call a station that is not in your directory, select Manual.

The radio prompts you to enter the MMSI number you want to call.

Enter the MMSI number the same way you enter directory entries (see

page 27) Enter all nine digits and press the SELECT button.

The radio prompts you to select a response channel. Use CHANNEL UP

and CHANNEL DOWN buttons to scroll through the available channels.

When you reach the channel you want to use for a response, press the

SELECT button.

The radio displays the MMSI number you are about to call and asks

you to conﬁrm. If you want to call the displayed MMSI number, select

Send. To cancel the call, select Cancel.

The radio automatically switches to channel 70 to transmit the call

request.

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Using Digital Selective Calling (DSC) Features

•

When the other station accepts the call, both radios switch to the se-

lected response channel for voice transmission.

If the other station cannot respond on the channel you selected, the

radio displays Not support CH.

Calling a particular group of stations (Group Call)

Group calling calls all the stations that share your group MMSI. You must

have a group MMSI programmed into the radio to make a group call, and

the stations (boats) you are calling must have this same group MMSI

programmed into their radios.

Press the MENU-PA button to display the menu.

Choose the DSC Call sub-menu and select Group.

The radio prompts you to select a response channel. Use the CHANNEL

UP and CHANNEL DOWN buttons to scroll through the available channels.

When you reach the channel you want to use for a response, press the

SELECT button.

The radio asks you to conﬁrm the call. Select Send to continue with the

call or select Cancel to cancel the call.

The radio switches to channel 70 to transmit the call request then

automatically switches to the selected response channel.

Calling all stations (All-Ships Call)

All ships calling contacts all DSC radios within range of your boat. You should

only use all ships calling in the event of a Safety warning (such as debris in

the water) or to request assistance in an Urgency (any situation where your

vessel has a serious problem but is not yet in distress).

Open the menu and select the DSC Call sub-menu.

Select All Ships, and then choose whether this is an Urgency call or a

Safety call.

The radio asks you to conﬁrm the call. Select Send to continue with the

call or select Cancel to cancel the call.

The radio automatically switches to channel 70 to transmit the call

request then automatically switches to channel 16, the designated

response channel for all-ships calling.

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Using Digital Selective Calling (DSC) Features

Making an automatic distress call

If you have programmed your MMSI number, the UM425 can transmit an

automated distress call with your current location and nature of the distress.

The radio then monitors the channel 16 for a response and repeats the

distress call every few minutes until it receives an acknowledgement.

To send an automatic distress call, press and hold the DISTRESS button

for three seconds. If no MMSI number has been programmed, the radio

prompts you to enter your MMSI number.

If you want to include the nature of your distress in the distress call, use the

distress procedure below:

Press the DISTRESS button.

The radio displays the list of distress conditions; use the CHANNEL UP

and CHANNEL DOWN buttons to highlight the nature of your distress,

then press and hold the DISTRESS button for three seconds.

•

Undesignated

Fire

•

Sinking

Adrift

Flooding

Collision

Grounding

Capsizing

Abandoning

Piracy/Armed

Overboard

If no MMSI number has been programmed, the radio prompts you to

enter your MMSI number.

Canceling an automatic distress call

While the radio is waiting for a response, it gives you the option of canceling

the call. To cancel the distress call, highlight Cancel and press the SELECT

button.

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Using Digital Selective Calling (DSC) Features

Receiving a DSC call

If your radio receives an individual DSC call from another station, it sounds

an incoming call tone and displays the name or MMSI number of the station

calling you. To respond to the call, select Send: Able-Comply; the radio sends

an acknowledgement and automatically switches to the designated response

channel. To reject the call, select Send: Unable-Comply; the radio advises the

other station that you are unable to respond to the call.

If the DSC request contains a response channel that you are not allowed to

use, the radio displays Not Support CH; your only response option is Send:

Unable-Comply.

If the radio receives a group or all ships call, it sounds an incoming call tone

and automatically switches to the designated response channel.

Receive log

Just like your telephone’s caller ID list, your radio keeps track of the calls you

receive but do not answer. The receive log is useful if you have been off your

boat or away from your radio and want to see who has tried to contact you.

The radio displays the last 10 distress calls and the last 20 non-distress calls

that it received.

DSC Call

SELECT

Distress Log

123456789

987654321

[Exit]

Receive Log

Distress

SELECT

Press the MENU-PA button to display the menu.

Choose the DSC Call sub-menu and then select Receive Log.

Select Distress to see the last 10 distress call received by the radio.

Select Other to see the last 20 normal calls received by the radio, then

choose from Individual, Group or All Ships calls.

Calls are listed in the order they were received, with the newest call

shown ﬁrst. The display blinks if there are new calls you have not

reviewed.

Select the call you want to see the details of. Use CHANNEL UP and

CHANNEL DOWN buttons to see all of the information. The log displays

different information depending on type of call received. See the table

below for the information stored for each type of call:

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Using Digital Selective Calling (DSC) Features

Table 7 - Receive Log

DSC Call Type

Distress

Receive Log Information

MMSI (or name), position, time, nature code.

Distress Acknowledge

MMSI (or name), distress MMSI, position, time,

nature code.

Distress Relay

MMSI (or name), distress MMSI, position, time,

nature code.

Distress Relay Acknowledge MMSI (or name), distress MMSI, position, time,

nature code.

Geographical

All Ships

MMSI (or name), category code.

Group

Individual

Individual Acknowledge

MMSI (or name), Completed/Unattended, category

code.

Test

MMSI (or name), category code.

Test Acknowledge

Pos Reply

Pos Request

Pos Send

MMSI (or name), category code.

MMSI (or name), position, time, category code.

MMSI (or name), category code.

MMSI (or name), position, time, category code.

Press the MENU-PA button to exit the detail screen and return to the log

menu.

From the log menu, select Exit to close the receive log and return to

the mode you were in.

Returning a call

You can return individual calls directly from the receive log. From the call

detail screen, press the CHANNEL DOWN button until Call Back appears at the

bottom of the display. Press the SELECT button to return that station's call.

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Using Digital Selective Calling (DSC) Features

Making Test Calls (Test)

You can use the test call feature to make sure your radio is working and

conﬁgured correctly. To avoid overloading coastal receiving stations, you

should limit test calls to these stations to once a week.

NOTE: Many coastal stations have speciﬁc frequencies and MMSI numbers

you should use for making test calls. Be sure to check with the coastal station

before making a DSC test call.

Press the MENU-PA button to display the menu.

Choose the DSC Call sub-menu, then select Test.

The radio displays the names listed in your directory; use the CHANNEL

UP and CHANNEL DOWN buttons to highlight the directory entry you want

to send a test call to and press the SELECT button.

Test

[Manual]

John Henry

Sam Adams

DSC Call

SELECT

Test

SELECT

If you want to send a test call to a station that is not in your directory,

select Manual. The radio prompts you to enter the MMSI number you

want to call. Enter the MMSI number the same way you enter directory

entries (see page 27). Enter all nine digits and press the SELECT

button.

The radio displays the MMSI number you

are about to call and asks you to conﬁrm.

If you want to call the displayed MMSI

number, select Send. To cancel the call,

Test

123456789

Send

Cancel

select Cancel.

The radio automatically switches to chan-

nel 70 to transmit the test call request,

then switches back to the last-used channel.

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Using Digital Selective Calling (DSC) Features

When the other station acknowledges

the test call, the radio displays an ac-

knowledgement screen.

Test

Acknowledged

123456789

Completed

Receiving a test call

When another station sends you a test call,

the radio displays the test request screen:

Test

123456789

To acknowledge the test call, select Reply

Cancel

To reject the test call, select Cancel.

Enabling automatic test call reply

If you want the radio to automatically reply to all test call, you can enable

automatic test call reply.

Press the MENU-PA button to display the menu.

Select Setup and then Test Reply.

Highlight Auto and press the SELECT button. The radio will

automatically send an acknowledgement when it receives a test call.

Test Reply

Setup

SELECT

Test Reply

Auto

Manual

SELECT

To disable automatic test call reply, repeat the steps above and select

Manual.

Requesting another station's position (POS Request)

Anytime you need to know where another boat currently is—to ﬁnd your

boating partners, to respond to a request for assistance, etc.—you can send

a position request to their radio:

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Using Digital Selective Calling (DSC) Features

Press the MENU-PA button to display the menu.

Choose the DSC Call sub-menu, then select POS Request.

The radio displays the names listed in your directory; use CHANNEL UP

and CHANNEL DOWN buttons to highlight the directory entry you want to

contact and press the SELECT button. If you want to contact a station

that is not in your directory, select Manual. The radio prompts you to

enter the MMSI number you want to call. Enter the MMSI number the

same way you enter directory entries (see page 27). Enter all nine

digits and press the SELECT button.

The radio displays the MMSI number you are about to contact and

asks you to conﬁrm. If you want to request the position of the displayed

MMSI number, select Send. To cancel the request, select Cancel.

When the other station responds, the radio displays the MMSI number,

the longitude, and the latitude of the other station. If your radio is

connected to a chartplotter through the NMEA OUT connection (see

page 48), the position information will also be displayed on the plotter

screen.

If the other station does not have valid GPS data, the radio displays No

Position.

Receiving a position request (Position Reply)

When another station requests your current position, the radio displays the

following screen:

To send your current position to the other

POS Request

station, select Reply; the radio transmits your

JOHN HENRY

latitude and longitude to the other station. If

you select Reply but the radio does not have

valid GPS data, it transmits the reply code

with No Position.

Cancel

To reject the position request, select Cancel.

Enabling automatic position reply

If you want the radio to automatically transmit your current position whenever

it receives a position request, you can enable automatic position reply. Most

boaters activate automatic position reply for safety reasons or because they

subscribe to a marine towing service. Sometimes—for example, in some

competitive situations--you may not want other stations to get your position

without your manual conﬁrmation

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Using Digital Selective Calling (DSC) Features

Press the MENU-PA button to display the menu.

Select Setup and then POS Reply.

Highlight Auto and press the SELECT button. The radio will

automatically transmit your position when it receives a position request.

To disable automatic position reply, repeat the steps above and select

Manual.

Sending your own position (Position Send)

If your radio is connected to a GPS receiver, you can send your boat’s

position to someone else. If you are requesting assistance or using an all

ships call to give a safety warning, you can send your current position so

other stations know where you are:

Press the MENU-PA button to display the menu.

Choose the DSC Call sub-menu, then select Position Send.

The radio displays the names listed in your directory; use CHANNEL UP

and CHANNEL DOWN buttons to highlight the directory entry you want to

contact and press the SELECT button. If you want to contact a station

that is not in your directory, select Manual. The radio prompts you to

enter the MMSI number you want to call. Enter the MMSI number the

same way you enter directory entries (see page 27). Enter all nine

digits and press the SELECT button.

The radio displays the MMSI number you are about to contact and

asks you to conﬁrm. If you want to transmit your position to the

displayed MMSI number, select Send. To cancel the transmission,

select Cancel.

The radio transmits your MMSI number, your longitude, and your

latitude to the other station.

Putting the radio into standby

If you are leaving your radio or do not wish to answer any DSC calls, you can

put your radio in standby mode. If your radio receives an individual call, it will

automatically respond with a message that indicates your radio is currently

"Unattended" on the display of the calling radio. Follow the steps below to put

your radio in standby:

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Using Digital Selective Calling (DSC) Features

1 Watt INT

Memory

DSC Standby

DSC Call

SELECT

Standby

SELECT

Unattended

Display the menu and choose the DSC Call sub-menu.

Select Standby to place your radio in standby mode. The radio displays

the standby screen, above.

To cancel standby and return to the mode your radio was in, press any

button.

Disabling automatic channel switching

If you are involved in a bridge-to-bridge call, you may not want the radio to

automatically switch channels when it receives a DSC call. In cases like this,

you can disable automatic channel switching. If you receive an individual call,

the radio will respond with an unattended code, just as if the radio were in

Standby.

Press the MENU-PA button to display the menu.

Select Setup and then Auto CH SW.

Highlight Off and press the SELECT button. The radio will not

automatically switch channels until you reactivate this feature.

NOTE: Use this feature with caution. Deactivating automatic switching and

then forgetting it can make it hard for you to receive DSC calls.

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Renaming Channels

If you discover that a marine radio channel has a different common name

in your local area, you can change the name of that channel to make it

easier for you to use (see the channel list on page 57 for the default channel

names). To rename a channel, follow the steps below:

Display the menu and choose the Setup sub-menu.

Select Channel Name. The screen displays the list of channels.

Use CHANNEL UP and CHANNEL DOWN buttons to highlight the channel

you want to change and press the SELECT button.

Select Rename to enter a new name for this channel. The radio

prompts you to enter a new name for this channel. Each name can be

up to 12 characters. Use the CHANNEL UP and CHANNEL DOWN buttons

to change the ﬁrst character. (See Table 6 Character and text entry

order on page 28 for the available characters and the order in which

they scroll).

When the ﬁrst character is correct, press the SELECT button. The cursor

moves to the next character. Enter the remaining 11 characters of the

name. If the name is shorter than 12 characters, press and hold the

SELECT button to complete the name entry.

When you ﬁnish entering the name, the radio displays the new channel

name and asks you to conﬁrm. To save this new channel name, select

Yes; to cancel the change, select No. The radio returns to the channel

list.

To restore a channel back to its original name, select the channel and

choose Default.

When you are satisﬁed with the channel list, select Exit to close the

menu screen.

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Installing the Hardware

Mounting the radio

The UM425 can sit at any angle in the mounting bracket so it can easily

accommodate the best location. First, determine the best place to mount the

radio. For optimum performance, ﬁnd a location that can:

•

Properly support the weight of the radio, approximately 2 pounds or

0.9 kilograms. You may need to use some type of anchor with the

mounting screws to hold the radio, depending on the surface.

•

Keep the battery leads as short as possible.

Keep the antenna lead-in wire as short as possible.

Allow free air ﬂow around the heat sink on the rear of the radio.

Avoid interference with the ship’s compass.

Install the radio into the mounting bracket, and connect the power

cable and accessory cable.

Step 1:

Slide the radio

into the mounting

bracket.

Step 2:

Tighten the mounting knobs

to secure the radio in place.

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Installing the Hardware

Position the radio into the desired location. Mark the edges of the

bracket on the mounting surface.

Remove the mounting bracket drill template from the back of the

manual, and use the template to mark the drill holes on the mounting

surface.

Drill the holes for the mounting bracket; be sure to follow any special

requirements of the mounting surface.

Remove the bracket from the radio, and use the mounting hardware to

secure the bracket to the mounting surface.

Hex nut

Spring washer

Washer

Mounting

surface

Mounting

bracket

Hex bolt

Install the radio back into the mounting bracket.

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Installing the Hardware

Connecting the radio

To operate correctly, your UM425 requires two electrical connections:

•

providing it with power from the boat’s electrical system

connecting a VHF-FM marine antenna to the antenna connector

Power supply requirements

VHF antenna requirements

Nominal 13.8 VDC power supply with

a negative ground (10.8 VDC to 15.6

VDC).

Power leads should be kept as short

as possible. A direct connection to the

power supply is ideal.

Male PL-259 connector

50 Ω impedance

Minimum 1.2m, 3 dB rated antenna for

sailboats or 2.4m, 6dB rated antenna for

powerboats

Minimum RG-58 lead-in wire for antenna

leads up to 6m to 10m, RG-8X for an-

tenna leads from 6m to 10m, or RG-8U

Minimum of #14 AWG copper wire for

extensions up to 6m, 12 AWG wire for

extensions from 6m to 10m, or 10 AWG for antenna leads from 10m to 18m.

wire for extensions from 10 to 18m

Red wire

(+)

13.8V DC

Black wire

Power

(-)

cable

Power

connector

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Installing the Hardware

Connect the BLACK wire of the included power cable to the

NEGATIVE (-) side of your power source.

Connect the RED wire of the included power cable to the POSITIVE

(+) side of your power source.

Connect the power cable to the power connector on the back of the

UM425. (The power connector only ﬁts one way.)

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

Install your antenna according to the manufacturer’s instructions.

See Antenna Selection and Installation on page 65 for more details.

Connect the PL-259 connector from the antenna lead-in wire to the

SO238 connector labeled ANTENNA on the back of the UM425.

Radio connector,

SO238 (female

PL-259)

Antenna lead-in

connector,

male PL-259

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Installing the Hardware

Connecting accessories

Connecting to a GPS receiver

If you connect the radio to a GPS receiver, the radio can automatically

transmit your current position during an automated distress call or during a

normal DSC call.

The UM425 supports a standard NMEA0183 input from a GPS receiver.

Follow the steps below to connect the UM425 to your GPS receiver:

Accessory

connector

Accessory

cable

Orange: NMEA OUT (-)

Black: Ext. Speaker (-)/GND

Green: GPS Data IN (+)

Red: External Speaker (+)

Bare wire: Ground/ GPS Data IN (-)

Brown: PA Speaker (+)

Blue: PA Speaker (-)/ GND

Yellow: NMEA OUT (+)

13.8V DC

Line up

arrows to

connect

Disconnect the accessory cable from the accessory connection on the

radio.

Connect the BARE wire of the included accessory cable to the

GROUND WIRE on your GPS receiver.

Connect the GREEN wire of the included accessory cable to the GPS

DATA OUTPUT WIRE on your GPS receiver. On page 46 is a table of

common GPS receivers and the proper connections:

NOTE: If not using the accessory connector make sure the cap is ﬁrmly secured.

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Installing the Hardware

Table 8 - Common GPS receivers and connections

GPS NMEA0183 OUTPUT

Wire Color

Ground Wire Color

(Connect to GREEN WIRE (connect to BARE

GPS Manufacturer Model Number(s)

on UM425)

WIRE on UM425)

Furuno

Garmin

GP1650, GP1850 White

Black

GP30, GP36

White

Blue

Fixed Mount

Black

Models

Garmin

JRC

Portable Models

100 Series

200 Series

GPS500

Brown

Green

White

Yellow

White

Black

Green

Black

JRC

Lowrance / Eagle Fixed Mount

Models

Lowrance / Eagle Portable Models

Orange

Gray

Black

Magellan

Fixed Mount

Models

Magellan

Northstar

RayMarine

Simrad

Portable Models

All Models

420

Orange

Yellow

Blue

Black

Brown

Yellow

520 / 620

RL Series

All Models

White

Sitex

Neptune, Nautilus Gray

CP150 / CP150C Green

Standard

Be certain all wire connections are secure and that all open wires are

adequately covered.

If you are ﬁnished connecting all external accessories, line up the

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

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Installing the Hardware

When the GPS receiver is correctly connected, the display shows GPS Data

OK. If there is a problem with the GPS connection, the display shows Check

GPS. When the display shows GPS Data OK, press the SELECT button to

open the GPS status screen and see detailed GPS data:

Time

Date

06/20 11:00:00

Current

channel

208^o30. 0 KT

Course

35^o40. 610 N

Latitude

139^o46. 564 E

Speed

Longitude

Conﬁguring the GPS

If the radio is receiving valid GPS data, it will automatically set the clock to

your local time based on the GPS location. You can adjust your local time

forward or back one hour if necessary (for example, if you are close to the

border of a time zone); you can also adjust for Daylight Savings Time.

Follow the steps below to adjust the time:

Setup

SELECT

Time Adjust

09 : 14

GPS Setup

Time Adjust

SELECT

Use the up or down

arrows to adjust the

time by one hour.

SELECT

Display the menu and choose the Setup sub-menu.

Select GPS Setup and then choose Time Adjust.

The display shows your current local time. To adjust the time forward

one hour, use the CHANNEL UP button. To adjust the time back one hour,

use the CHANNEL DOWN button. Press the SELECT button when you are

ﬁnished.

The display prompts you to conﬁrm the setting: choose Set to save the

new time or Cancel to exit time setup without saving. The radio returns

to the GPS Setup menu.

If your local area observes Daylight Savings Time, highlight Daylight

Save and press the SELECT button.

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Installing the Hardware

If Daylight Savings Time is currently in effect, select On. If Daylight

Savings Time is not currently in effect, select Off.

Press the SELECT button. The radio activates the new time setting and

returns to the GPS Setup menu.

Connecting to a charplotter

The UM425 provides a standard NMEA0183 GPS output that you can

connect to a chartplotter. When it receives another boat’s position data in a

DSC call, the radio sends the position data to the chartplotter so you can see

the location:

Disconnect the accessory cable from the accessory connection on the

radio.

Connect the ORANGE wire of the accessory cable to the NEGATIVE

(-) wire of your chartplotter’s NMEA data INPUT.

Connect the YELLOW wire of the accessory cable to the POSITIVE

(+) wire of your chartplotter’s NMEA data INPUT

Be certain all wire connections are secure and that all open wires are

adequately covered.

If you are ﬁnished connecting all external accessories, line up the

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

Connecting to an external speaker

You can use an external speaker to monitor the radio from a different part of

your boat or in a noisy environment. If you adjust the VOLUME-PWR knob on

the radio, it will also adjust the external speaker volume.

The UM425 supports an external speaker with the following speciﬁcations:

•

Minimum impedance of 4 Ohms

•

Minimum power handling of 10 Watts

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Installing the Hardware

Disconnect the accessory cable from the accessory connection on

the radio.

Connect the BLACK wire of the accessory cable to the GROUND

WIRE of your external speaker.

Connect the RED wire of the accessory cable to the POSITIVE (+)

WIRE of your external speaker.

Be certain all wire connections are secure and that all open wires are

adequately covered.

If you are ﬁnished connecting all external accessories, line up the

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

Connecting to an external PA speaker

If you connect the radio to a PA speaker, you can use the PA feature to make

announcements to other boats and people nearby.

The UM425 supports an external PA speaker with the following speciﬁcations:

•

Minimum impedance of 4 Ohms

Minimum power handling of 10 Watts

Disconnect the accessory cable from the accessory connection on the

radio.

Connect the BLUE wire of the accessory cable to the GROUND

WIRE of your PA system.

Connect the BROWN wire of the accessory cable to the POSITIVE

(+) WIRE of your PA system.

Be certain all wire connections are secure and that all open wires are

adequately covered.

If you are ﬁnished connecting all external accessories, line up the

arrows on the side of the accessory cable and connector and connect

the accessory cable to the accessory connector on the back of the

UM425.

NOTE: To extend the life of the radio, use waterproof tape to seal

electrical connections.

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Installing the Hardware

Using the PA feature

Press and hold the MENU-

PA button for two seconds

to activate the PA feature.

The display shows PA in the

upper right hand corner.

Public Address

Mode Selected

Press and hold the microphone

PUSH TO TALK button. Speak clearly

in your normal voice (you don’t have

to shout). Use the VOLUME-PWR knob

on your UM425 to adjust the volume of the PA speaker.

Release the PUSH TO TALK button when you're ﬁnished talking.

To turn off the PA feature and return to the radio mode you were using,

press and hold the MENU-PA button for two seconds again.

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Maintenance and Troubleshooting

Due to its rugged design, the UM425 requires very little maintenance. Howev-

er, it is a precision electronic instrument, so you should follow a few precau-

tions:

•

If the antenna has been damaged, you should not transmit except in

the case of an emergency. A defective antenna may cause damage to

your radio.

•

You should arrange for periodic performance checks with your Uniden

dealer.

Common questions

Problem

Things to Try

The radio won’t power on.

Check the power connections.

Check the fuse.

Check the master battery switch and branch

circuit that connect to the radio.

The radio won’t transmit.

Make sure you are not in scan mode.

Make sure you are not trying to transmit on a

receive-only channel (see the channels and

frequency tables starting on page 57).

Make sure you are transmitting at the correct

power level for this channel (see the channels and

frequency tables starting on page 57).

Make sure the duration of each transmission is

less than 5 minutes.

Noise comes out of the

speaker all the time

Adjust the squelch level; it is probably too low.

I can’t hear anything (no vol-

ume) from the speaker.

Adjust the squelch level; it is probably too high.

I can transmit, but no one can Check your UIC channel settings (see Setting the

hear me.

UIC channel mode (USA/CAN/INT) on page 12).

I can’t read the display.

Adjust the contrast and backlight brightness level

(see page 22)

The display is too bright at

night.

Adjust the backlight brightness level.

(see page 22)

I can’t see any words on the

display.

Reset the radio back to the default contrast level:

turn off the radio; hold the menu key and turn it

back on.

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Maintenance and Troubleshooting

Problem

Things to Try

I’m not getting any GPS data

on my display.

Make sure your GPS receiver is correctly

connected (see Connecting to a GPS receiver).

Make sure your GPS receiver is working properly.

Make sure that your GPS receiver supports the

NMEA parameters described in NMEA Operation

on page 63.

I can’t make Group DSC calls. Make sure the Group MMSI was entered

correctly.

Where can I ﬁnd my radio’s

Look on the bottom side of the radio

serial number?

The radio won’t let me enter

Contact customer service by visiting the customer

my User MMSI. What do I do? support page on www.uniden.com.au or

www.uniden.co.nz.

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Maintenance and Troubleshooting

Engine Noise Suppression

Interference from the noise generated by the electrical systems of engines

is sometimes a problem with radios. The UM425 has been designed to be

essentially impervious to ignition noise and alternator noise. However, in

some installations it may be necessary to take measures to further reduce the

effect of noise interference. The UM425 radio DC battery wires, antenna lead,

and accessory cables should be routed away from the engine and engine

compartment, and from power cabling carrying high currents. In severe cases

of noise interference, it may be necessary to install a noise suppression kit.

Contact the dealer where you purchased the radio for more information.

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Specifications

Speciﬁcations

Table 9 - Radio speciﬁcations

(All speciﬁcations are subject to change without notice.)

General

Controls

VO L U M E -PW R , Squelch

Status Indicators

Transmit power, Scan mode, Triple Watch mode, Battery

High, Battery low, USA, CAN, INT, Memory, GPS status

and Channel Display

Display

Buttons

LCD (Full Dot Matrix)

16/9-Tri, Scan-Mem, Channel Up, Channel Down, Menu-

PA, Select, 1/25W, and Distress.

Connectors

Size

Antenna, accessory, and DC power

H 66.6 mm x W 162.6 mm x L 128 mm (without Heat Sink)

H 2.62 inches x W 6.40 inches x L 5.04 inches (without

Heat Sink)

Weight

0.93kg (2.05 pounds)

Supply Voltage

Nominal 13.8V DC, negative ground (10.8 VDC to 15.6

VDC)

Standard Accessories

Mounting bracket and hardware, DC power cable,

microphone hanger, spare fuse, accessory cable

Antenna Impedance

Microphone

50 Ω nominal

Rugged 2 kΩ condenser mic element with coiled cord

45 mm (1.77 inch), 8 Ω

Speaker

Operating Temperature Range

Shock and Vibration

–15 °C to + 55 °C (+5 °F to +131 °F)

Meets or exceeds EIA standards, RS152B and RS204C

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Specifications

Transmitter

Power Output

Power Requirement

Modulation

1 watt or 25 watt (user selectable)

25 watts output: [email protected] DC

±5 kHz deviation

Hum and Noise Signal-to-Noise 45 dB with 3 kHz deviation with 1000 Hz modulating

frequency (nominal)

Audio Distortion

Less than 8% with 3 kHz deviation with 1000 Hz

modulating frequency

Spurious Suppression

Output Power Stabilization

Frequency Range

Frequency Stability

Receiver

-45 dBm @ Hi, -55 dBm @ Lo

Built-in automatic level control (ALC)

156 to 158 MHz

±1.5kHz @ –15°C to + 55°C

Frequency Range

Sensitivity

156 to 162 MHz

0.25 μV for 12 dB SINAD

Dual Conversion Super Heterodyne PLL (Crystal for DSC)

0.2 μV Threshold

Circuit

Squelch Sensitivity

Spurious Response

Adjacent Channel Selectivity

Audio Output Power

Power Requirement

75 dB

78 dB @ ±25 kHz

2.5 watts (10% Distortion, 8 Ω load)

400 mA @ 13.8V DC at squelched, 1000 mA @ 13.8V DC

at maximum audio output

IF Frequencies

1st 41.925 MHz, 2nd 455 kHz (1st 21.7 MHz, 2nd 455 kHz

for DSC)

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Specifications

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Specifications

Channel and frequencies

Table 10 - International Channel Frequencies and Channel Tag

Ch No.

RX Freq

160.6500

160.7000

160.7500

160.8000

160.8500

156.3000

160.9500

156.4000

156.4500

156.5000

156.5500

156.6000

156.6500

156.7000

156.7500

156.8000

156.8500

161.5000

161.5500

161.6000

161.6500

161.7000

161.7500

161.8000

161.8500

161.9000

161.9500

162.0000

160.6250

160.6750

160.7250

160.7750

160.8250

160.8750

160.9250

156.3750

156.4250

156.4750

( 156.5250

TX Freq

156.0500

156.1000

156.1500

156.2000

156.2500

156.3000

156.3500

156.4000

156.4500

156.5000

156.5500

156.6000

156.6500

156.7000

156.7500

156.8000

156.8500

156.9000

156.9500

157.0000

157.0500

157.1000

157.1500

157.2000

157.2500

157.3000

157.3500

157.4000

156.0250

156.0750

156.1250

156.1750

156.2250

156.2750

156.3250

156.3750

156.4250

156.4750

156.5250 )

Status

Duplex

Simplex

Duplex

Simplex

Simplex, 1W

Simplex

Simplex, 1W

Duplex

Full Name

Marine operator

Inter-ship safety

Marine operator

Commercial (ship-ship)

Boater calling channel

Commercial

Vessel trafﬁc system

Bridge to bridge

Vessel trafﬁc system

Environmental

Distress, Safety, Calling

Govt maritime control

Port operation

Commercial

Port operation

Duplex

Port operation

Marine operator

Bridge to bridge

Non commercial

DSC

Duplex

Simplex

DSC Only

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Specifications

Table 10 - International Channel Frequencies and Channel Tag

(cont'd)

Ch No.

RX Freq

156.5750

156.6250

156.6750

156.7250

156.7750

156.8250

156.8750

161.5250

161.5750

161.6250

161.6750

161.7250

161.7750

161.8250

161.8750

161.9250

157.3750

157.4250

TX Freq

156.5750

156.6250

156.6750

156.7250

156.7750

156.8250

156.8750

156.9250

156.9750

157.0250

157.0750

157.1250

157.1750

157.2250

157.2750

157.3250

157.3750

157.4250

Status

Simplex

Simplex, 1W

Simplex

Duplex

Full Name

Non commercial

Port operation

Port operation (ship-ship)

Port operation

Marine operator

Duplex

Simplex

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Specifications

Table 11 - USA Channel Frequencies and Channel Tag

Ch No.

RX Freq (MHz) TX Freq (MHz)

Status

Full Name

Vessel trafﬁc system/

Commercial

Vessel trafﬁc system /

Commercial

1 “A”

156.0500

156.2500

156.0500

156.2500

Simplex

5 “A”

Simplex

7 “A”

156.3000

156.3500

156.4000

156.4500

156.5000

156.5500

156.6000

156.6500

156.7000

156.7500

156.8000

156.8500

156.9000

156.9500

161.6000

157.0000

157.0500

157.1000

157.1500

161.8000

161.8500

161.9000

161.9500

162.0000

156.1750

156.2750

156.3250

156.3750

156.4250

156.4750

( 156.5250

156.5750

156.6250

156.6750

156.7250

156.775

156.3000

156.3500

156.4000

156.4500

156.5000

156.5500

156.6000

156.6500

156.7000

Inhibit

Simplex

Inter-ship safety

Commercial

Non commercial

Commercial

Vessel trafﬁc system

Simplex, 1W Bridge to bridge

Simplex Vessel trafﬁc system

Receive Only Environmental

156.8000

156.8500

156.9000

156.9500

157.0000

157.0500

157.1000

157.1500

157.2000

157.2500

157.3000

157.3500

157.4000

156.1750

156.2750

156.3250

156.3750

156.4250

156.4750

156.5250 )

156.5750

156.6250

156.6750

156.7250

156.7750

Simplex

Distress, Safety, Calling

Simplex, 1W Govt maritime control

18 “A”

19 “A”

20 “A”

21 “A”

22 “A”

23 “A”

63 “A”

65 “A”

66 “A”

Simplex

Duplex

Simplex

Duplex

Simplex

Commercial

Port operation

Coast guard only

Coast guard

Coast guard only

Marine operator

Vessel trafﬁc system

Port operation

Simplex, 1W Bridge to bridge

Simplex

DSC Only

Simplex

Non commercial

DSC

Non commercial

Non commercial (ship-ship)

Port operation

Simplex, 1W Port operation

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Specifications

Table 11 - USA Channel Frequencies and Channel Tag (cont'd)

Ch No.

RX Freq (MHz) TX Freq (MHz)

Status

Full Name

156.825

156.8750

156.9250

156.9750

157.0250

157.0750

157.1250

157.1750

161.8250

161.8750

161.9250

157.3750

157.4250

156.8250

156.8750

156.9250

156.9750

157.0250

157.0750

157.1250

157.1750

157.2250

157.2750

157.3250

157.3750

157.4250

Simplex, 1W Port operation

Simplex, 1W Port operation (ship-ship)

78 “A”

79 “A”

80 “A”

81 “A”

82 “A”

83 “A”

Simplex

Duplex

Simplex

Non commercial

Commercial

Government

Coast guard

Marine operator

Commercial (ship-ship)

The "A" indicates simplex use of the ship station transmit side of an international duplex channel, and that operations are different from that of

international operations on that channel.

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Specifications

Table 12 - Canadian Channel Frequencies and Channel Tag

Ch No.

RX Freq

160.6500

160.7000

160.7500

156.2000

156.2500

156.3000

156.3500

156.4000

156.4500

156.5000

156.5500

156.6000

156.6500

156.7000

156.7500

156.8000

156.8500

156.9000

156.9500

161.6000

157.0500

157.1000

161.7500

161.8000

161.8500

161.9000

161.9500

162.0000

160.6250

156.0750

156.1250

156.1750

160.8250

156.2250

156.2750

156.3250

156.3750

156.4250

156.4750

TX Freq

156.0500

156.1000

156.1500

156.2000

156.2500

156.3000

156.3500

156.4000

156.4500

156.5000

156.5500

156.6000

156.6500

156.7000

156.7500

156.8000

156.8500

156.9000

156.9500

157.0000

157.0500

157.1000

157.1500

157.2000

157.2500

157.3000

157.3500

157.4000

156.0250

156.0750

156.1250

156.1750

156.2250

156.2750

156.3250

156.3750

156.4250

156.4750

Status

Duplex

Full Name

Marine operator

Canadian coast guard

Vessel trafﬁc system

Inter-ship safety

Commercial

Boater calling channel

Commercial

Vessel trafﬁc system

Bridge to bridge

Vessel trafﬁc system

Environmental

Distress, Safety, Calling

State control

Commercial

Duplex

4 “A”

5 “A”

7 “A”

Simplex

Simplex, 1W

Simplex

Simplex, 1W

Simplex

Duplex, 1W

Simplex

Duplex

18 “A”

19 “A”

21 “A”

22 “A”

Canadian coast guard

Port operation

Canadian coast guard

Marine operator

Canadian coast guard

Port operation

Duplex

61 “A”

62 “A”

63 "A"

64 “A”

65 “A”

66 “A”

Simplex

Duplex

Simplex

Simplex, 1W

Simplex

DSC Only

Marine operator

Port operation

Bridge to bridge

Non commercial

DSC

( 156.5250 156.5250 )

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Specifications

Table 12 - Canadian Channel Frequencies and Channel Tag (cont'd)

Ch No.

78 “A”

79 “A”

80 “A”

81 “A”

82 “A”

83 “A”

RX Freq

156.5750

156.6250

156.6750

156.7250

156.7750

156.8250

156.8750

156.9250

156.9750

157.0250

157.0750

157.1250

161.7750

157.1750

161.8250

161.8750

161.9250

157.3750

157.4250

TX Freq

156.5750

156.6250

156.6750

156.7250

156.7750

156.8250

156.8750

156.9250

156.9750

157.0250

157.0750

157.1250

157.1750

157.2250

157.2750

157.3250

157.3750

157.4250

Status

Simplex

Simplex, 1W

Simplex

Duplex

Simplex

Duplex

Simplex

Full Name

Non commercial

Port operation

Inter ship

Canadian coast guard

Marine operator

Port operation

The "A" indicates simplex use of the ship station transmit side of an international duplex channel, and that operations are different from that of

international operations on that channel.

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Specifications

NMEA Operation

This radio supports NMEA0183 version 3.01.

NMEA Input

If you have difﬁculty getting the UM425 to receive data from your GPS receiver,

check the device’s conﬁguration. It should be set to the parameters shown in the

table below.

Table 13 - NMEA Input Parameters

The radio supports RMC, GLL, GNS,

Baud rate

Data bits

4800 bps

GGA and ZDA sentences. When

these sentences are received, the

radio displays latitude/longitude,

date, time, course, and speed. If

any sentence except an RMC or

GLL sentence is received, the radio

uses the information based on the

following priority order.

Parity

None

Stop bits

Data amplitude

Drive capability

Over 3.0 V

Over 10 mA

•

Status:RMC > GLL > GNS > GGA

Latitude/Longitude:RMC > GLL > GNS > GGA

UTC Time: RMC > GLL > GNS > GGA > ZDA

Date: RMC > ZDA

Speed / Course:RMC

NOTES :

•

If the radio receives only a GLL sentence, the radio does not display the

current speed, course, and date.

If the radio receives both RMC and GLL sentences, the radio uses only

the RMC sentence.

Status data is used to check whether the GPS data is valid or invalid.

NMEA Output

When the radio receives a DSC call (Distress, Position Reply, or Position

Send), it outputs a DSC/DSE sentence from the NMEA output port.

NOTE: When the radio receives a distress call, it outputs a sentence in the

following format.

•

$CDDSC,12,3081234000,,07,00,0354013946,0657,,,S,E*6D

$CDDSE,1,1,A,3081234000,00,60875646*13

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Regulations and Safety Warnings

Basic radio guidelines

You should familiarize yourself with the rules on marine radios and be aware

of which rules apply to your boat.

DSC: Frequently Asked Questions

The following information is sourced from the Australian Maritime Safety Authority's

DSC FAQ.

What is the status of VHF DSC coverage in Australia?

In Australian waters, VHF DSC is for ship-to-ship alerting. There is no ofﬁcial

shore-based infrastructure but there are a number of volunteer marine rescue

(VMR) stations that have installed VHF DSC and a check with your local

VMR should be made.

VHF DSC for small craft is primarily for distress, urgency and safety

purposes.

How should VHF DSC be used?

In Australian waters, Channel 70 should be used for DSC distress alerts only.

Once an alert has been sent the party in distress should monitor Channel

16, the distress and calling channel. Parties receiving the DSC distress alert

should switch to Channel 16 and acknowledge the MAYDAY call by voice

giving their identity and signalling “Received MAYDAY”. If the party in distress

does not receive an acknowledgement to their DCS alert they should transmit

the standard MAYDAY call by voice on Channel 16. There are still quite a

number of boats that do not carry DSC radios.

Because Channel 16 is the distress and calling frequency it should only be

used for general trafﬁc to raise another party. Once contact has been made,

all routine trafﬁc should be passed on another agreed VHF channel.

Is a call sign or Maritime Mobile Service Identity (MMSI)

needed?

An MMSI is a unique nine-digit code set into your DSC terminal to identify

your vessel. You need only one of these if you have multiple DSC radios. You

use the same MMSI for all radios on board the one vessel as it is a ship’s

identity. Because VHF radios now operate under a Class License there is

no requirement for an ofﬁcial call sign but an operator must have a Maritime

Radio Operators Certiﬁcate of Proﬁciency (MROCP).

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Regulations and Safety Warnings

How can a MMSI be applied for?

The Australian Maritime Safety Authority allocates MMSI. To apply for an

MMSI complete the MMSI Application form available for download via

www.amsa.gov.au/mmsi. This page has important information about MMSI

and DSC radio.

What qualiﬁcations are needed to operate a VHF DSC radio?

The minimum qualiﬁcation to operate a VHF radio with or without DSC is a

Marine Radio Operator’s VHF Certiﬁcate of Proﬁciency (MROVCP). VHF

radios are covered by a Class License so an individual station license is no

longer required.

The Marine Radio Operator’s Handbook produced by the Australian Maritime

College provides further information about qualiﬁcations, licensing and DSC

operations. It is available at www.amcom.amc.edu.au

Antenna Selection and Installation

Your UM425 has been designed to accommodate all of the popular marine VHF

antennas. However, the selection and the proper installation of the antenna is the

responsibility of the user or installer.

The antenna used with this radio should be installed using the following guidelines to

ensure a safe distance between the antenna and persons close by.

•

Small whip antennas (3 dB) or smaller should be installed with at least 1m away

from any area where people are likely to be.

•

Larger antennas (6 dB or 9 dB) should be installed with at least 2m away.

While the radio is transmitting, do not come closer to the antenna than the

recommended safe distance.

•

Do not touch the antenna when the radio is powered on and might begin

transmitting.

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Two Year Limited Warranty

UNIDEN UM425 VHF

IMPORTANT Satisfactory evidence of the original purchase is required for warranty service

Please refer to our Uniden website for any details or warranty durations offered in addition to those

contained below.

Warrantor

The warrantor is either Uniden Australia Pty Limited ABN 58 001 865 498 (“Uniden Aust”) or Uniden New

Zealand Limited (“Uniden NZ”) as the case may be.

Terms of Warranty

Uniden Aust/NZ warrants to the original retail purchaser only that the UM425 VHF (“the Product”), will be

free from defects in materials and craftsmanship for the duration of the warranty period, subject to the

limitations and exclusions set out below.

Warranty Period

This warranty to the original retail purchaser is only valid in the original country of purchase for a Product

first purchased either in Australia or New Zealand and will expire two (2) years from the date of the original

retail sale.

If a warranty claim is made, this warranty will not apply if the Product is found by Uniden to be:

(A) Damaged or not maintained in a reasonable manner or as recommended in the relevant Uniden

Owner’s Manual;

(B) Modified, altered or used as part of any conversion kits, subassemblies or any configurations not sold

by Uniden Aust or Uniden NZ;

(D) Repaired by someone other than an authorized Uniden Repair Agent in relation to a defect or

malfunction covered by this warranty; or

(E) Used in conjunction with any equipment, parts or a system not manufactured by Uniden.

Parts Covered

This warranty covers the Product and included accessories.

User-generated Data

This warranty does not cover any claimed loss of or damage to user-generated data (including but without

limitation phone numbers, addresses and images) that may be stored on your Product.

Statement of Remedy

If the Product is found not to conform to this warranty as stated above, the Warrantor, at its discretion,

will either repair the defect or replace the Product without any charge for parts or service. This warranty

does not include any reimbursement or payment of any consequential damages claimed to arise from a

Product’s failure to comply with the warranty.

Our goods come with guarantees that cannot be excluded under the Australian Consumer Law. You are

entitled to a replacement or refund for a major failure and for compensation for any other reasonably

foreseeable loss or damage. You are also entitled to have the goods repaired or replaced if the goods fail

to be of acceptable quality and the failure does not amount to a major failure.

This warranty is in addition to and sits alongside your rights under either the COMPETITION AND

CONSUMER ACT 2010 (Australia) or the CONSUMER GUARANTEES ACT (New Zealand) as the case

may be, none of which can be excluded.

Procedure for Obtaining Warranty Service

Depending on the country in which the Product was first purchased, if you believe that your Product does

not conform with this warranty, you should deliver the Product, together with satisfactory evidence of your

original purchase (such as a legible copy of the sales docket) to Uniden at the addresses shown below.

You should contact Uniden regarding any compensation that may be payable for your expenses incurred

in making a warranty claim. Prior to delivery, we recommend that you make a backup copy of any phone

numbers, images or other data stored on your Product, in case it is lost or damaged during warranty

service.

UNIDEN AUSTRALIA PTY LTD

Service Division

UNIDEN NEW ZEALAND LTD

Service Division

345 Princes Highway,

150 Harris Road, East Tamaki

Auckland 2013

Rockdale, NSW 2216

Phone number: 1300 366 895

Email address: [email protected]

Phone number: (09) 273 8377

Email address: [email protected]

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Mounting Bracket Template

15.5 mm/

0.61 in

(5/8)

18.5 mm/

0.73 in (3/4)

53 mm/

2.1 in (2 3/32)

5.5 mm/

0.2 in

(7/32)

8 mm

/0.31 in

(5/16)

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Printed in PRC UTZZ01627ZA(0)

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