Furuno FM-4721 User manual

OPERATOR'S MANUAL

MARINE VHF

RADIOTELEPHONE

MODEL

FM-4721

www.furuno.com

IMPORTANT NOTICES

General

• This manual has been authored with simplified grammar, to meet the needs of international us­ers.

• The operator of this equipment must read and follow the descriptions in this manual. Wrong op­eration or maintenance can cancel the warranty or cause injury.

• Do not copy any part of this manual without written permission from FURUNO.

• If this manual is lost or worn, contact your dealer about replacement.

• The contents of this manual and equipment specifications can change without notice.

• The example screens (or illustrations) shown in this manual can be different from the screens
you see on your display. The screens you see depend on your system configuration and equip­ment settings.

• Save this manual for future reference.

• Any modification of the equipment (including software) by persons not authorized by FURUNO
will cancel the warranty.

• All brand and product names are trademarks, registered trademarks or service marks of their
respective holders.

How to discard this product

Discard this product according to local regulations for the disposal of industrial waste. For disposal
in the USA, see the homepage of the Electronics Industries Alliance (http://www.eiae.org/) for the
correct method of disposal.

How to discard a used battery

Some FURUNO products have a battery(ies). To see if your product has a battery, see the chapter
on Maintenance. Follow the instructions below if a battery is used. Tape the + and - terminals of
battery before disposal to prevent fire, heat generation caused by short circuit.

In the European Union

The crossed-out trash can symbol indicates that all types of batteries
must not be discarded in standard trash, or at a trash site. Take the
used batteries to a battery collection site according to your national
legislation and the Batteries Directive 2006/66/EU.

In the USA

The Mobius loop symbol (three chasing arrows) indicates that Ni-Cd
and lead-acid rechargeable batteries must be recycled. Take the
used batteries to a battery collection site according to local laws.

In the other countries

Ni-Cd Pb

Cd

There are no international standards for the battery recycle symbol. The number of symbols can
increase when the other countries make their own recycle symbols in the future.

i

SAFETY INSTRUCTIONS

CAUTION

The operator and installer of this equipment must read the safety instructions before attempting to install
or operate the equipment.

WARNING

CAUTION

Warning, Caution

Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.

Indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury.

Prohibitive Action

WARNING

Do not open the equipment.

The equipment uses high voltage that
can cause electrical shock. Refer any
repair work to a qualified technician.

If water leaks into the equipment or
something is dropped into the equip­ment, immediately turn off the power
at the switchboard.

Fire or electrical shock can result.

If the equipment is giving off smoke
or fire, immediately turn off the power
at the switchboard.

WARNING

Fire or electrical shock can result.

If you feel the equipment is acting
abnormally or giving off strange
noises, immediately turn off the
power at the switchboard and contact
a FURUNO service technician.

Mandatory Action

WARNING

Do not disassemble or modify the
equipment.

Fire, electrical shock or serious injury
can result.

Make sure no rain or water splash
leaks into the equipment.

Fire or electrical shock can result if
water leaks into the equipment.

Do not place liquid-filled containers
on or near the equipment.

Fire or electrical shock can result if a
liquid spills into the equipment.

Do not operate the equipment with
wet hands.

Electrical shock can result.

Use the proper fuse.

WARNING

Use of the wrong fuse can cause fire or
electrical shock.

CAUTIO

Do not touch any part of the antenna
when the equipment is transmitting.

Electrical shock can result.

ii

SAFETY INSTRUCTIONS

CAUTION

WARNING

Do not open the equipment unless
totally familiar with electrical circuits.

The equipment uses high voltage that
can cause electrical shock.

Turn off the power at the mains
switchboard before beginning the
installation. Post a warning sign near
the switchboard to indicate that
power should not be applied while the
equipment is being installed.

Electrical shock, serious injury or fire can
result if the power is not turned off or is
applied while the equipment is being
installed.

RADIO FREQUENCY RADIATION
HAZARD

Distances at which RF radiation level of
100, 10 and 5.05 W/m
below.

2

100 W/m
10 W/m

5.05 W/m

: Not applicable

2

: Not applicable

2

: 1.0 m

2

are shown

CAUTIO

Confirm that the power supply voltage
is compatible with the voltage rating
of the equipment.

Connection to the wrong power supply
can cause fire or damage the equipment.

Follow the compass safe distances
shown in the table below to prevent
interference to a magnetic compass.

Standard
compass

Transceiver Unit
FM-4721

Handset
HS-4721

1.70 m

0.70 m

Steering

compass

1.10 m

0.45 m

iii

TABLE OF CONTENTS

FOREWORD ..................................................................................................................vii

SYSTEM CONFIGURATION ........................................................................................viii

1. GETTING STARTED..............................................................................................1-1

1.1 Emergency Call (CH16) ............................................................................................. 1-1

1.2 How to Call Another Vessel (CH16 or CH9) .............................................................. 1-1

1.3 How to Make Telephone Calls ................................................................................... 1-2

1.4 Channels 13 and 67 (USA channel group only)......................................................... 1-2

2. OPERATION ..........................................................................................................2-1

2.1 Controls...................................................................................................................... 2-1

2.1.1 Transceiver Unit............................................................................................. 2-1

2.1.2 Handset HS-4721........................................................................................... 2-3

2.2 Reception ...................................................................................................................2-5

2.3 Transmission.............................................................................................................. 2-5

2.4 Transmit Timeout Timer (TOT) .................................................................................. 2-6

2.5 Simplex/Duplex Channel Use .................................................................................... 2-6

2.6 International, Canada, and USA Mode ......................................................................2-6

2.7 Backlight Adjustment..................................................................................................2-6

2.8 NOAA Weather Channels .......................................................................................... 2-7

2.8.1 NOAA weather alert ....................................................................................... 2-7

2.8.2 NOAA weather alert test ................................................................................ 2-7

2.9 Dual Watch (To CH16)...............................................................................................2-8

2.10 Scanning ....................................................................................................................2-8

2.10.1 How to select the scan type ...........................................................................2-8

2.10.2 How to program the scan memory................................................................. 2-9

2.10.3 Memory scanning (M-SCAN) ......................................................................... 2-9

2.10.4 Priority scanning (P-SCAN)..........................................................................2-10

2.11 How to Preset Channels (0-7): Instant Access ........................................................2-10

2.11.1 How to preset channels................................................................................2-10

2.11.2 How to activate preset channels ..................................................................2-11

2.11.3 How to delete preset channels..................................................................... 2-11

2.12 PA HAIL, FOG HORN Operation ............................................................................. 2-11

2.12.1 PA HAIL mode .............................................................................................2-11

2.12.2 FOG HORN mode........................................................................................ 2-12

2.13 Intercom Operation .................................................................................................. 2-13

2.13.1 Communication ............................................................................................ 2-13

2.13.2 How to call on the Intercom..........................................................................2-14

2.14 Bluetooth Operation (option) ....................................................................................2-14

2.14.1 Pairing..........................................................................................................2-14

2.14.2 Operation ..................................................................................................... 2-15

2.14.3 VOX feature ................................................................................................. 2-15

2.14.4 Battery saver................................................................................................2-16

2.15 Voice Scrambler (option).......................................................................................... 2-16

3. DIGITAL SELECTIVE CALLING ...........................................................................3-1

3.1 General ......................................................................................................................3-1

3.2 Maritime Mobile Service Identity (MMSI) ................................................................... 3-1

3.2.1 What is an MMSI?..........................................................................................3-1

3.2.2 How to enter your MMSI number ................................................................... 3-1

3.3 DSC Distress Alert ..................................................................................................... 3-2

3.3.1 How to transmit a DSC Distress Alert ............................................................ 3-2

iv

TABLE OF CONTENTS

3.3.2 How to receive a DSC Distress Alert..............................................................3-5

3.4 All Ships Call ..............................................................................................................3-6

3.4.1 How to transmit an All Ships call....................................................................3-6

3.4.2 How to receive an All Ships call .....................................................................3-7

3.5 Individual Call .............................................................................................................3-7

3.5.1 How to register DSC stations to the Individual Directory................................3-7

3.5.2 How to select the Individual call reply method ...............................................3-8

3.5.3 How to select the Individual call acknowledge method ..................................3-9

3.5.4 Individual/Group call ringer.............................................................................3-9

3.5.5 How to transmit an Individual call.................................................................3-10

3.5.6 How to receive an Individual call..................................................................3-11

3.6 DSC Log...................................................................................................................3-13

3.6.1 Transmitted call log ......................................................................................3-13

3.6.2 Distress log...................................................................................................3-13

3.6.3 Other call log ................................................................................................3-13

3.6.4 How to delete calls from a log ......................................................................3-14

3.7 Group Call ................................................................................................................3-14

3.7.1 How to register DSC stations to the Group Directory...................................3-14

3.7.2 How to transmit a Group call........................................................................3-16

3.7.3 How to receive a Group call .........................................................................3-17

3.8 Position Request Call ...............................................................................................3-18

3.8.1 How to set up a position request reply .........................................................3-18

3.8.2 How to set up the position request ringer.....................................................3-18

3.8.3 How to transmit a Position Request call to another vessel ..........................3-19

3.8.4 When you receive a Position Request call...................................................3-20

3.9 Position Report Call..................................................................................................3-20

3.9.1 How to enable, disable the position report ringer .........................................3-20

3.9.2 How to transmit a Position Report call .........................................................3-21

3.9.3 When you receive a Position Report call......................................................3-22

3.10 Auto DSC Polling......................................................................................................3-23

3.10.1 Selecting stations to be automatically polled (tracked) ................................3-23

3.10.2 Enable/Disable auto DSC polling .................................................................3-24

3.11 Auto CH Switch Time ...............................................................................................3-24

3.12 DSC Test..................................................................................................................3-25

3.12.1 How to make a DSC test call with MMSI in the Individual Directory.............3-25

3.12.2 How to make a DSC test call by manually entering MMSI ...........................3-26

4. GENERAL SETUP.................................................................................................4-1

4.1 Display Contrast .........................................................................................................4-1

4.2 Time Offset .................................................................................................................4-1

4.3 Time Area ...................................................................................................................4-2

4.4 Time Notation .............................................................................................................4-2

4.5 Units of Measurement ................................................................................................4-2

4.6 COG Display Format ..................................................................................................4-3

4.7 Manual Input of the Position (Lat/Lon)........................................................................4-3

4.8 Key Beep....................................................................................................................4-4

4.9 Treble and Bass Audio Tone Control .........................................................................4-4

4.10 Fog Alert Tone Frequency..........................................................................................4-4

4.11 How to Name the Radio or Handset...........................................................................4-5

4.12 Soft Keys....................................................................................................................4-6

4.12.1 Transceiver unit..............................................................................................4-6

4.12.2 Handset HS-4721...........................................................................................4-7

4.13 Calendar Setup...........................................................................................................4-7

4.14 How to Set the Timeouts ............................................................................................4-9

v

TABLE OF CONTENTS

5. CHANNEL FUNCTION SETUP..............................................................................5-1

5.1 CH Group ................................................................................................................... 5-1

5.2 Scan Memory ............................................................................................................. 5-1

5.3 Scan Type ..................................................................................................................5-2

5.4 Scan Resume.............................................................................................................5-2

5.5 Priority CH..................................................................................................................5-2

5.6 Weather Alert Setup................................................................................................... 5-3

5.7 Channel Naming ........................................................................................................ 5-4

6. ATIS SETUP...........................................................................................................6-1

6.1 ATIS Code Programming ........................................................................................... 6-1

6.2 ATIS Channel Group.................................................................................................. 6-2

7. MAINTENANCE, TROUBLESHOOTING...............................................................7-1

7.1 General Maintenance................................................................................................. 7-1

7.2 Troubleshooting Chart................................................................................................7-2

7.3 How to Replace the Fuse........................................................................................... 7-3

7.4 How to Clear the Memory .......................................................................................... 7-3

7.5 How to Reset the Microprocessor .............................................................................. 7-3

7.6 Daily Test ...................................................................................................................7-4

8. INSTALLATION .....................................................................................................8-1

8.1 Transceiver Unit ......................................................................................................... 8-1

8.1.1 Desktop or overhead mount...........................................................................8-1

8.1.2 Flush mount (option) ...................................................................................... 8-2

8.2 Antenna......................................................................................................................8-2

8.3 Coaxial Cable.............................................................................................................8-3

8.4 Electrical Connections................................................................................................8-3

8.5 Accessory Cable ........................................................................................................ 8-5

8.6 Handset HS-4721.......................................................................................................8-6

8.6.1 How to use an external speaker..................................................................... 8-8

8.7 How to Set up the Equipment from the Menu ............................................................ 8-8

8.7.1 How to set time offset to show local time.......................................................8-8

8.7.2 How to show local time or UTC time..............................................................8-9

8.7.3 How to set the time notation........................................................................... 8-9

8.7.4 How to select GPS COG format..................................................................... 8-9

8.8 Optional Equipment..................................................................................................8-10

8.8.1 Bluetooth Adapter Unit BU-1........................................................................8-10

8.8.2 Voice Scrambler FVP-42.............................................................................. 8-11

APPENDIX 1 CHANNEL ASSIGNMENTS, MENU TREE ........................................AP-1

SPECIFICATIONS .....................................................................................................SP-1

INDEX..........................................................................................................................IN-1

Declaration of Conformity

vi

FOREWORD

A Word to the Owner of the FM-4721

FURUNO Electric Company thanks you for purchasing the FM-4721 Marine VHF Radiotelephone.
We are confident you will discover why the FURUNO name has become synonymous with quality
and reliability.

For over 60 years FURUNO Electric Company has enjoyed an enviable reputation for quality and
reliability throughout the world. This dedication to excellence is furthered by our extensive global
network of agents and dealers.

Your equipment is designed and constructed to meet the rigorous demands of the marine envi­ronment. However, no machine can perform its intended function unless properly installed and
maintained. Please carefully read and follow the operation, installation and maintenance proce­dures set forth in this manual.

We would appreciate feedback from you, the end-user, about whether we are achieving our pur­poses.

Thank you for considering and purchasing FURUNO.

Features

The FURUNO FM-4721 is a Marine VHF Radiotelephone designed for use in the frequency range
of 156.025 to 163.275 MHz. The FM-4721 can be powered with 10.8 to 15.6 VDC power and has
a switchable RF output power of 1 Watt or 25 Watts.

The FM-4721 operates on all currently allocated marine channels. Channels are switchable for
use with USA, International, or Canadian regulations. Emergency CH16 can be immediately se­lected by pressing the 16/9 key. NOAA weather channels (where available) can also be accessed
immediately by pressing the CLR/WX key.

The FM-4721 incorporates DSC (Digital Selective Calling) Class D facilities that comply with ITU­R M.493-12 (DSC Class D). Class D operation provides continuous watch on DSC CH70 even if
the radio is receiving a call.

The main features are

• Class D DSC (Digital Selective Calling) with Distress, Individual and All Ship calls

• Navigation information (LAT/LON, SOG, COG) shown on the display*

• Navigate to a DSC Distress Position*

• Automatic DSC Position Poll request to up to four separate vessels

• Menu system with user-programmable soft keys

• Dedicated channel 70 receiver for continuous DSC watch

• Submersible IPX-7 rating (1 meter for 30 minutes)

• 30 Watt PA/Loudhailer (option) with pre-programmed fog signals and listenback facility

• ClearVoice noise-cancelling microphone with channel selector and 16/9 key

• Handset HS-4721 can operate as a remote station

• Intercom facility between Handset and Radio

• Optional Bluetooth Adapter Unit enables communication with bluetooth devices

• Optional Voice Scrambler provides secure communications with other so equipped FM-4721
*: Requires external GPS navigator.

vii

SYSTEM CONFIGURATION

ANTENNA UNIT

TRANSCEIVER UNIT
FM-4721

Handset HS-4721

MEM

GPS Navigator

Loudhailer /PA Horn

Handset HS-4721

Optional, local supply
equipment indicated
with dashed lines.

Voice Scrambler FVP-42
(inside transceiver)

Bluetooth Adapter Unit BU-1
(inside transceiver)

Bluetooth Headset BH-2A

External Speaker

Handheld MIC

10.8 - 15.6 VDC

viii

1. GETTING STARTED

1.1 Emergency Call (CH16)

CH16 is known as the Hail and Distress Channel. An emergency may be defined as
a threat to life or property. In such instances, be sure the transceiver is on and set to
CH16. Then use the following procedure:

1. Press the microphone’s push-to-talk (PTT) switch and say "Mayday, Mayday,
Mayday. This is XXXXX, XXXXX, XXXXX" (your vessel's name).

2. Then repeat once: "Mayday, XXXXX" (your vessel's name).

3. Report your position in latitude/longitude, or give a true or magnetic bearing (state
which) to a well-known landmark such as a navigation aid or geographic feature
such as an island or harbor entry.

4. Explain the nature of your distress (sinking, collision, aground, fire, piracy, life­threatening injury, etc.).

5. State the kind of assistance you desire (pumps, medical aid, etc.).

6. Report the number of persons aboard and condition of any injured.

7. Estimate the present seaworthiness and condition of your vessel.

8. Give your vessel's description: length, design (power or sail), color and other dis­tinguishing marks. The total transmission should not exceed one minute.

9. End the message by saying "OVER". Release the microphone switch and listen.

10. If there is no answer, repeat the above procedure. If there is still no response, try
another channel.

Note: The FM-4721 has DSC Distress calling, which can send a distress call digitally
to all ships with compatible DSC radios. Refer to chapter 3 “DIGITAL SELECTIVE
CALLING".

1.2 How to Call Another Vessel (CH16 or CH9)

CH16 (or CH9, depending on area) should be used as the calling channel for initial
contact with another vessel. However, its primary purpose is for emergency commu­nications and should be monitored at all times when not using other channels.

It is monitored by Coast Guard stations in all countries and other vessels.

The use of CH16 should be limited to making initial contact only. Calling should not
exceed one minute, but may be repeated at two-minute intervals.

Prior to making contact with another vessel, refer to the channel charts in the Appen­dix and select an appropriate channel (working channel) for use after initial contact.
Monitor the proposed channel to ensure you won’t be interrupting other traffic and then
go back to CH16 to make your initial call.

When channel 16 is clear, state the name of the vessel you wish to call and then "this
is" followed by the name of your vessel and your vessel callsign. When the other ves­sel returns your call, immediately request another channel by saying "go to", the num-

1-1

1. GETTING STARTED

ber of the other channel, and "over". Then switch to the new channel. When the new
channel is not busy, call the vessel.

After a transmission, say "over", and release the PTT (Push-To-Talk) switch on the
microphone. When all communication with the vessel is completed, end the last trans­mission by stating your callsign and the word "out". Note that it is not necessary to
state your callsign with each transmission, only at the beginning and end of the con­tact.

Remember to return to CH16 when not using another channel. Some radios automat­ically monitor CH16 even when set to other channels or when scanning.

1.3 How to Make Telephone Calls

To make a radiotelephone call, use a channel designated for this purpose. The fastest
way to learn which channels are used for radiotelephone traffic is to ask at a local ma­rina. Channels available for such traffic are designated Public Correspondence
channels on the channel charts in the Appendix. Some examples for USA use are
Channels 24, 25, 26, 27, 28, 84, 85, 86, and 87. Call the marine operator and identify
yourself by your vessel's name. The marine operator then asks you how you want to
pay for the call (telephone credit card, collect, etc.) and then link your radio transmis­sion to the telephone lines.

The marine telephone company managing the VHF channels you are using may
charge a link-up fee in addition to the cost of the call.

1.4 Channels 13 and 67 (USA channel group only)

Channel 13 is used at docks and bridges and by vessels maneuvering in port. Mes­sages on this channel must concern navigation only, such as meeting and passing in
restricted waters.

Channel 67 is used for navigational traffic between vessels.

By regulation, power is normally limited to 1 Watt on these channels. Your radio is pro­grammed to automatically reduce power to this limit on these channels. However, in
emergency situations it may be necessary to temporarily use a higher power. See
page 2-1 (H/L key) for how to temporarily override the low-power limit on these two
channels.

1-2

2. OPERATION

2.1 Controls

This section describes the controls of the Transceiver Unit (including the optional mi­crophone) and the Handset HS-4721.

2.1.1 Transceiver Unit

11

MEM

10

1

No. Control Description

1 VOL

(Volume Control
Knob)

2 SQL

(Squelch Control)

3 Soft keys The three soft keys functions can be customized on the Setup Menu.

4 16/9 • Momentary press: Recall CH16 from any channel location.

5 H/L Toggle between 25 W (High) and 1 W (Low) power. When the TX output

6 CALL/MENU • Momentary press: Open the [DSC Menu].

3

2

• Adjust the audio volume level. Turn this knob clockwise to increase

• Control the listenback volume in the PA or Fog mode.
Note: Turn off the set with minimum volume. When you turn on the set,
adjust the volume to a comfortable level. This allows you to hear distress
calls and raw voice clearly.

Adjust this control clockwise to set the point at which random noise on
the channel does not activate the audio circuits but a received signal
does. This point is called the squelch threshold. Further adjustment of
the squelch control may degrade reception of wanted transmissions.

See section 4.12 "Soft Keys". When one of the soft keys is pressed
briefly, all the functions of the soft keys appear above their associated
keys.

• Long press: Recall CH9. (CH9 is used in some parts of the world as

Press the key again to return to the previously selected working chan­nel.

power is set to "Low" while the transceiver is on channel 13 or 67, the
output power is temporarily switched from "Low" to "High" power until
the PTT switch is released. The H/L key does not function on transmit
inhibited and low power only channels.

• Long press: Open the [Setup Menu].

4

the audio volume level.

an alternative calling channel to CH16.)

5 6 7 8 9

2-1

2. OPERATION

No. Control Description

7 CH • Select channels and select menu items. The S and T keys on the

microphone can also be used to select channels and menu items.

• In the PA or Fog mode, change the output volume of the connected
horn speaker.

8

(POWER)

9 MIC connector Connector for the supplied noise-canceling speaker microphone.

10 1 When in the radio mode, this key directly inputs the digit "1" in a channel

2/MEM • Radio mode: Directly input the digit "2" in a channel number.

3/SCAN • Radio mode: Directly input the digit "3" in a channel number.

4/DIM • Radio mode: Directly input the digit "4" in a channel number.

5/IC • Radio mode: Directly input the digit "5" in a channel number.

6/DW • Radio mode: Directly input the digit "6" in a channel number.

7/SQRM • Radio mode: Directly input the digit "7" in a channel number.

8/PA • Radio mode: Directly input the digit "8" in a channel number.

9/FOG • Radio mode: Directly input the digit "9" in a channel number.

0 In the radio mode, directly input the digit "0" in a channel number.
CLR/WX • Cancel the menu selection and/or key input.

ENT Confirm the menu selection and/or key input.
FUNC Activate the "Alternate" key function.

11 DISTRESS Send a DSC Distress Alert. See section 3.3.1 "How to transmit a DSC

Power the transceiver on and off. To turn the transceiver on, press and
hold this key until the LCD turns on. To turn it off, press and hold this key
until the LCD turns off. When the power is turned on, the transceiver is
set to the last-selected channel.

number.

• FUNC key→ 2/MEM key: Memorize the selected channel into the
transceiver scan memory for scanning. Repeat the same procedure
(FUNC → 2/MEM) to delete the channel from the scan memory. See
section 2.10 "Scanning" for details.

• FUNC key→3/SCAN key: Start and stop scanning on programmed
channels. This function depends on scanning type setting. See
section 2.10 "Scanning" for details.

• FUNC key→4/DIM key: Access the [LCD Dimmer] menu. See
section 2.7 "Backlight Adjustment" for details.

• FUNC key→5/IC key: Activate the intercom mode between the radio
and the Handset. See section 2.13 "Intercom Operation" for details.

• FUNC key→6/DW key: Scan for voice communications on the priority
channel and another selected channel until a signal is received on ei­ther channel (Dual Watch). See section 2.9 "Dual Watch (To CH16)"
for details.

• FUNC

• FUNC key→ 8/PA key: Operate the 30 Watt PA function. See

• FUNC key→9/FOG key: Operate the Fog Horn function. See

• Press and hold the key to recall the previously selected NOAA weath-

Distress Alert".

key→7/SQRM key: Operate the Voice Scrambler function
when the optional FVP-42 Voice Scrambler Unit is installed. See
section 2.15 "Voice Scrambler (option)" for details.

section 2.12 "PA HAIL, FOG HORN Operation" for details.

section 2.12 "PA HAIL, FOG HORN Operation" for details.

er channel from any channel. Press and hold the key again to revert
to the previously selected working channel.

2-2

2. OPERATION

15

12

16

13

14

No. Control Description

12 PTT switch

(Push-To-Talk
Switch)

13 Microphone The microphone has Clear Voice Noise Reduction Technology, which

Radio mode, PTT switch pressed: The transmitter is enabled for voice
communications with another vessel.PA mode: Press the PTT switch to
amplify your voice over a PA horn. HS-4721 Handset connected and
intercom mode enabled: Press the PTT switch to enable voice commu­nications between the FM-4721 and the HS-4721.

reduces the amount of background (wind, engine) noise transmitted.
Note: Position your mouth about 1.5 cm away from the microphone hole
and speak in a normal voice.

14 Microphone

speaker

15 S, T The S and T on the microphone function the same as the CH knob on

16 16/9 • Momentary press: Recall CH16 from any channel location.

Talk into the speaker to transmit your voice.

the front panel of the transceiver.

• Long press: Recall CH9. (CH9 is used in some parts of the world as
an alternative calling channel to CH16.)

Press the key again to revert to the previously selected working channel.

2.1.2 Handset HS-4721

The HS-4721 Handset remotely operates all VHF, DSC, setup menus, and PA/Fog
modes. The HS-4721's operation is same as FM-4721 except the receiver audio vol­ume setting and squelch level setting. The HS-4721 is supplied with 7 m of routing ca­ble and can be extended up to 21 m using three 7 m extension cables model CT-100.
The Intercom feature can be used between the HS-4721 and the FM-4721. In addition,
speaker wires are supplied at the panel mount of the routing cable to connect an ex­ternal speaker. This can be useful when it is difficult to hear voice over the handset,
because of noisy environment.

2-3

2. OPERATION

CALL

MEM

No. Control Description

1

(POWER)

2 PTT switch

Press and hold down this key to turn the transceiver and Handset on or
off.

Push this key to enable the transmitter.
(Push-To-Talk
Switch)

3 DISTRESS Transmit a DSC Distress Alert. See chapter 3.
4 Display Full dot matrix display.
5 Soft keys These three key's functions can be customized by the [Setup Menu]

mode. When press one of these key briefly, the key functions appear at

the bottom of the display. See section 4.12.2 Soft Keys.

6 16/9 • First press: CH16 is immediately selected.

• Second press: Recall the last selected channel.

• Press and hold: Select channel 9.

S, T These keys are used to select channels, adjust the volume and squelch

level, and to select DSC calls, DSC setup and Radio setup function.

VOL/SQ

(Volume Con­trol / Squelch
Control)

• First press: Volume adjustment mode

• Second press: Squelch adjustment mode

• Third press: Exit adjustment mode

When in volume or squelch mode, press the S or T keys to adjust the

level.
H/L Toggle between high and low power. When the H/L key is pressed while

the transceiver is on CH13 or CH67, the power is temporarily switched

from LO to HI until the PTT switch is released. The H/L key is inoperative

on transmission inhibited and low-power only channels.
CALL/MENU • Press this key to access the [DSC MENU].

• Press and hold this key to access the [SETUP MENU].

FUNC Press this key to activate the Alternate key function.

7 See respective description on page 2-2.
8 Speaker The internal speaker is located here.
9 Microphone The internal ClearVoice Noise Canceling mic is located here.

When transmitting, position your mouth about 1.5 centimeter away from

the small mic hole. Speak slowly and clearly into the microphone.

2-4

2.2 Reception

1. After the transceiver has been installed, ensure that the power supply and anten­na are properly connected.

2. Press and hold the PWR key until the radio turns on.

3. Rotate the SQL knob fully counterclockwise. This state is known as "squelch off".

4. Rotate the VOL knob clockwise until noise or audio from the speaker is at a com­fortable level.

5. Rotate the SQL knob clockwise until the random noise just disappears. This state
is known as the "squelch threshold”.

6. Rotate the CH knob to select a channel. Refer to the channel chart in the Appendix
for available channels.

7. The numeric keys on the front panel may be used to directly select channels.
For example, to select CH68:

1) Press the 6/DW key.

2) Press the 8/PA key.

3) Press the ENT key.

2. OPERATION

In the USA and Canadian modes, press and hold down the 0 key to select the "A"
channel. For example, to select CH22A:

1) Press the 2/MEM key.

2) Press the 2/MEM key.

3) Press the 0 key until "A" appears to the right of the channel number.

4) Press the ENT key.

8. When a message is received, adjust the volume to the

desired listening level. The indicator on the
display indicates communications is being received.

2.3 Transmission

1. Do steps 1 through 6 in section 2.2 "Reception".

2. Before transmitting, monitor the channel to ensure it is
clear.

3. Press the PTT (push-to-talk) switch on the micro-

phone. The indicator appears on the display.

4. Speak slowly and clearly into the microphone.

5. When the transmission is finished, release the PTT switch.

Note: This is a noise-canceling microphone. Position the slot labeled "MIC" within 1.5
cm from your mouth for optimum performance.

2-5

2. OPERATION

2.4 Transmit Timeout Timer (TOT)

When the PTT switch on the microphone is pressed continuously, transmit time is lim­ited to five minutes. This limits unintentional transmissions due to a stuck PTT switch.
About 10 seconds before automatic transmitter shutdown, a warning beep sounds
from the speaker(s). The transceiver automatically goes to the RX mode, even if the
PTT switch is continually held down. To transmit again, the PTT switch must first be
released and then pressed again.

CAUTION: The heatsink can get hot enough to cause fire or burn injury when the TX
to RX ration goes lower than 1:9.

2.5 Simplex/Duplex Channel Use

Refer to the VHF Marine Channel Chart in the Appendix for instructions on use of sim­plex and duplex channels.

Note: All channels are factory-programmed in accordance with FCC (USA), Industry
Canada (Canada), and International regulations. Mode of operation cannot be altered
from simplex to duplex or vice-versa.

2.6 International, Canada, and USA Mode

To change the channel Group call from International to Canada or USA:

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Rotate the CH knob to select [CH Group] then press
the [SELECT] soft key.

4. Rotate the CH knob to select a channel Group [USA],
[INTL], or [CAN (CANADA)] then press the [ENT] soft key to store the selected
setting.

Note: When in INTL channel group, inland waterways channel group can be se­lected from the ATIS menu by switching ATIS to ON. See section 6.2.

5. Press the [QUIT] soft key several times to return to radio operation.

2.7 Backlight Adjustment

Adjust the display illumination for viewing in sunlight or darkness.

2-6

1. Press the FUNC key followed by the 4/DIM key to show the [Dimmer] menu.

2. Rotate the CH knob to select the desired level. When
[OFF] is selected, the backlight is turned off.

3. Press the [ENT] soft key to store the selected level,
and return to radio operation.

2.8 NOAA Weather Channels

1. To receive a NOAA (National Oceanographic and Atmospheric Administration)
weather channel, press and hold the CLR/WX key for two seconds on any chan­nel. The transceiver chooses the last selected weather channel.

2. Rotate the CH knob to select a different NOAA weather
channel.

3. To exit from the NOAA weather channels, press and
hold the CLR/WX key. The transceiver returns to the
channel in use before the weather channel.

2.8.1 NOAA weather alert

In the event of extreme weather disturbances, such as storms and hurricanes, the
NOAA sends a weather alert accompanied by a 1050 Hz tone and subsequent weath­er report on one of the NOAA weather channels. When the Weather Alert feature is
enabled (see section 5.6 "Weather Alert Setup"), the transceiver is capable of receiv­ing this alert by doing the following:

2. OPERATION

1. Program NOAA weather channels into the transceiver's memory for scanning.
Follow the same procedure as for regular channels under paragraph 2.10.3
"Memory scanning (M-SCAN)".

2. Press the FUNC key followed by the 3/SCAN key to start memory scanning.

3. The programmed NOAA weather channels are scanned along with the regular­programmed channels. However, scanning does not stop on a normal weather
broadcast unless a NOAA alert is received.

4. When an alert is received on a NOAA weather channel, scanning stops and the
transceiver emits a loud beep to alert the user of a NOAA broadcast.

5. Press the CLR/WX key to stop the alert and receive the weather report.

Note 1: If the CLR/WX key is not pressed the alert sounds for five minutes and then
the weather report is received.

Note 2: While listening to a weather channel, the radio can decode a weather alert
and sound an alarm.

2.8.2 NOAA weather alert test

NOAA tests the alert system every Wednesday between 11AM and 1PM UTC time.
To test the FM-4721's NOAA weather feature (at the above-mentioned time) follow the
procedure in paragraph 2.8.1 "NOAA weather alert" and confirm that the alert sounds.

2-7

2. OPERATION

2.9 Dual Watch (To CH16)

Dual watch scans two channels for communications. One channel is a normal VHF
channel and the other is CH16. When a signal is received on the normal channel, the
radio briefly switches between the normal channel and CH16 to look for a transmis­sion. If the radio receives communications on CH16, the radio stops and listens to
CH16 until communication ends and then starts dual watch scan again.

1. Adjust the SQL knob until the background noise just disappears.

2. Select the channel you wish to dual watch with CH16.

3. Press the FUNC key followed by the 6/DW key.
The display alternately scans between CH16 and the channel that was selected
in step 2.
If a transmission is received on the channel selected in step 2, the FM-4721 starts
dual watch on CH16.

4. To stop dual watch, press the FUNC key followed by the 6/DW key.

Note: The priority channel may be changed from CH16 to another channel. Refer to
section 5.5 "Priority CH".

2.10 Scanning

Allows the user to select the scan type: Memory scan or Priority scan. [Memory Scan]
scans the channels that were programmed into memory. [Priority Scan] scans the
channels programmed in memory with the priority channel.

2.10.1 How to select the scan type

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Select [Scan Type] with the CH knob then press the
[SELECT] soft key.

4. Rotate the CH knob to select [Priority Scan] or [Mem­ory Scan] then press the [ENT] soft key to store the se­lected scan type.

DailyTest

2-8

5. Press the [QUIT] soft key several times to return to ra­dio operation.

2.10.2 How to program the scan memory

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup].

3. Press the [SELECT] soft key, then rotate the CH knob to select [Scan Memory CH]
then press the [SELECT] soft key.

4. Rotate the CH knob to select a desired channel to be
scanned, then press the [ADD] soft key. [MEM] icon
appears on the display, which indicates the channel
has been programmed to the scan channel.

5. Repeat step 4 for all the desired channels to be
scanned.

6. To delete a channel from the list, select the channel then press the [DELETE] soft
key. "MEM" disappears from the display.

7. When you have completed your selection, press the [QUIT] soft key several times
to return to radio operation.

Note: You may add/delete the current channel to/from the scan list by pressing the
FUNC key followed by the 2/MEM key.

2. OPERATION

2.10.3 Memory scanning (M-SCAN)

1. Adjust the SQL knob until background noise just dis-
appears.

2. Press the FUNC key followed by the 3/SCAN key. "M­SCAN" appears on the display. Scanning starts from
the lowest to the highest programmed channels and
preset channels (described in the next section) and stops on a channel when a
transmission is received.

3. The channel number blinks during scanning.

4. To stop scanning, press the 16/9 or CLR/WX key, or the FUNC key followed by
the 3/SCAN key.

CH88

CH72

CH68

CH61

CH01

CH22

CH09

CH12

CH15

CH18

2-9

2. OPERATION

2.10.4 Priority scanning (P-SCAN)

In the default setting, CH16 is set as the priority channel. (See section 5.5 for how to
set priority channel.) You may change the priority channel from 16 to another channel
as shown below.

1. Adjust the SQL knob until background noise disap­pears.

2. Press the FUNC key followed by the 3/SCAN key. "P-
SCAN" appears on the display. Scanning starts be­tween the memorized channels and preset channels
(described in next section) and the priority channel. The priority channel is
scanned after each programmed channel.

3. To stop scanning, press the 16/9 or CLR/WX key, or the FUNC key followed by
the 3/SCAN key.

CH72

CH68

CH88

CH61

CH01

Priority Channel

CH22

CH09

CH12

CH15

CH18

2.11 How to Preset Channels (0-7): Instant Access

Eight preset channels can be programmed for instant access. Press one of the soft
keys then press the [PRESET] soft key to activate the user assigned channel bank.

Before beginning the instant access operation, assign the PRESET command into the
one of the programmable keys. See section 4.12 "Soft Keys".

2.11.1 How to preset channels

1. Rotate the CH knob to select the channel to be pro­grammed.

2. Press one of the soft keys momentarily then press and
hold the [PRESET] soft key until the channel number
blinks.

2-10

3. Rotate the CH knob to select the desired preset chan­nel ([SET 0] - [SET 7]) you wish to program. When you
recall a preset channel (for example, SET 1) that is al­ready programmed, the operating channel number (for
example, 6) is shown to the right of the preset channel
number.

4. Press the [ADD] soft key momentarily to program the
channel into the preset channel.

5. Repeat steps 1 through 4 to program the desired chan­nels into preset channels 0 to 7.

2.11.2 How to activate preset channels

1. Press one of the soft keys momentarily then press the
[PRESET] soft key to recall the preset channel. The in­dication "P SET" above the channel number.

2. Rotate the CH knob to select the desired preset chan­nel (0 to 7). The preset channel number appears ([P
SET0] - [P SET7]) while selecting the preset channel.

3. Press one of the soft keys momentarily then press the
[PRESET] soft key again to return to the last selected
"regular" channel. The indication "P SET" disappears
from the display.

2.11.3 How to delete preset channels

1. Recall the preset channel as directed in
paragraph 2.11.2.

2. Rotate the CH knob to select the preset channel to de­lete.

2. OPERATION

3. Press one of the soft keys momentarily. Press and
hold the [PRESET] soft key until the indication "SET(0-

7)" and the channel number flash.

4. Press the [DELETE] soft key.

2.12 PA HAIL, FOG HORN Operation

The FM-4721 has a 30W Loudhailer that can be used with any 4-ohm PA horn. FU­RUNO offers a small and a large PA HAIL horn, the 220SW and 240SW, respectively.
In the PA HAIL mode, the PA speaker listens back (acts as a microphone and sends
sound to the front panel speaker and the speaker microphone) through the PA horn,
which provides two-way communications through the PA horn.

PA HAIL mode: Allows the transceiver to be used as a Loudhailer when an optional
speaker is installed. The PA HAIL mode has a listen-back feature that provides two­way communication through the PA HAIL Speaker.

FOG HORN mode: Selected signal (see page 2-13) is transmitted through the PA
HAIL speaker. When the Fog horn, Bells or Whistle signal is not being outputted the
FM-4721 listens back through the connected PA horn.

QUITDELETE

Note: In the PA HAIL or FOG HORN mode, the FM-4721 receives communications
on the last-selected VHF channel before entering into the PA HAIL or FOG HORN
mode and receive DSC calls.

2.12.1 PA HAIL mode

1. Press the FUNC key followed by the 8/PA key to acti­vate the PA Hail mode. The indication "PA" appears on
the display.

2. Press the PTT switch to speak through the HAIL/PA
speaker.

2-11

2. OPERATION

3. Rotate the CH knob to control the AF output level. The
AF output level can be set from 0 to 30 watts.

4. Rotate the VOL knob to adjust the listenback volume.

5. To exit the PA HAIL mode, press the [QUIT] soft key or

CLR/WX key.

2.12.2 FOG HORN mode

There are eight signals to select from: [Underway], [Stop],
[Sail], [Tow], [Aground], [Anchor], [Horn], and [Siren].

1. Press the FUNC key followed by the 9/FOG key.

2. Rotate the CH knob to select one of the eight functions
described above. (For the timing specification for each
signal, see the International Regulations for Preventing Collisions at Sea.)

3. Press the [ENT] soft key.

4. On the [Horn] and [Siren] modes, press the PTT switch
to activate the tone through the HAIL/PA speaker. Ro­tate the CH knob to control the AF output level, which
can be set from 0 to 30 watts.

5. If the fog signal is not output, rotate the VOL knob to
adjust the listenback volume.

6. To exit the FOG HORN mode, press the [QUIT] soft
key or CLR/WX key.

FOG HORN timing chart

Type Pattern Usage

[Underway] One 5-second blast every 120 seconds. Motor vessel underway and

making way.

[Stop] Two 5-second blasts (separated by 2 seconds) ev-

ery 120 seconds.

[Sail] One 5-second blast followed by two 1-second

blasts (separated by 2 seconds) every 120 sec­onds.

[Tow] One 5-second blast followed by three 1-second

blasts (separated by 2 seconds) every 120 sec-

onds.
[Aground] One 11-second ring every 60 seconds. Vessel is aground.
[Anchor] One 5-second ring every 60 seconds. Vessel is at anchor.
[Horn] Varying pitch (yelp) tone while pressing the PTT

switch.
[Siren] Passing signal while the PTT switch is pressed.

Motor vessel underway but
stopped (not making way).

Sailing vessel underway, fish­ing vessel (underway or an­chored), vessel not undercom­mand, a vessel restricted in her
ability to maneuver (underway
or at anchor), or a vessel towing
or pushing another ahead.

Vessel is being towed
(manned).

2-12

2.13 Intercom Operation

The intercom function is available if your radiotelephone is equipped with two HS-4721
Handsets.

2.13.1 Communication

1. Press the FUNC key followed by the 5/IC key to enable
the intercom mode.

2. Use the CH knob to select the intercom to use
([RAM1], [RAM2], or [ALL]), then press the ENT key.
When the intercom mode is enabled, "Intercom" is dis­played on the radio and the HS-4721.

3. Press the PTT switch on the radio. [Talk] appears on the display.

2. OPERATION

FM-4721’s PTT switch is pressed

HS-4721’s PTT switch is pressed

Note: A warning beep sounds when the radio’s PTT and the Handsets’ PTT are
pushed at the same time.

4. Speak slowly and clearly into the microphone. Hold the microphone about 1.5 cm
away from your mouth.

5. When finished, release the PTT switch.

6. Press the [QUIT] soft key or the CLR/WX key to exit the intercom mode and revert
to the radio mode.

2-13

2. OPERATION

2.13.2 How to call on the Intercom

Press the [BELL] soft key on either the radio or a Handset to generate a calling beep
at the station called.

RAM1 RAM2 RAM1 RAM2 RAM1 RAM2 RAM1 RAM2

RADIO RAM1

RADIO RAM2

RAM1 RAM2

2.14 Bluetooth Operation (option)

Installation of the optional BU-1 Bluetooth Adapter Unit enables the FM-4721 to send/
receive voice messages with a BH-2A Bluetooth Headset via wireless links. When the
BH-2A is connected, [Bluetooth] appears in the [General Setup Menu].

2.14.1 Pairing

Before you use the BH-2A Bluetooth Headset, pair the BH­2A Bluetooth Headset and the FM-4721 as follows:

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

2. Rotate the CH knob to select [General Setup] then
press the [SELECT] soft key.

3. Rotate the CH knob to select [Bluetooth] then press
the [SELECT] soft key.

4. Rotate the CH knob to select [PAIRING] then press the
[SELECT] soft key.

ALL

Daily Test

General Setup Menu

2-14

5. Bring the BH-2A Bluetooth Headset close to the FM­4721, then press and hold the POWER switch on the
BH-2A until the LED indicator blinks red and blue alter­nately.

6. Press the [ENT] soft key to initiate the pairing.

7. When the BH-2A is correctly recognized (approx. 20 to
30 seconds) by the FM-4721, the BH-2A's LED indica­tor blinks blue, and "Pairing Succeeded" appears on
the display of the FM-4721.

8. Press the [QUIT] soft key several times to exit this
menu and return to radio mode.

Note: When the BH-2A is correctly recognized by the FM-4721, the icon appears
at the top right corner on the display.

2.14.2 Operation

1. When the BH-2A is correctly recognized by the FM-

4721, icon appears on the display of the FM-4721

and the LED indicator of the BH-2A blinks blue.

2. Adjust the receiver audio level using the VOLUME(+)/
VOLUME(-) switches on the BH-2A.

3. Press the PTT switch on the BH-2A to transmit. Release the PTT switch to return
to receive.

4. The communication range between the BH-2A and FM-4721 is around 7 m (21 ft).
If you move out of range, a beep sounds from the BH-2A to alert you. If you move
back into range, the BH-2A beeps to alert you that you are back within range.

5. When the battery voltage of the BH-2A is low, the following occurs:

a) The LED blinks red and blue alternately.

b) A beep sounds from the BH-2A.

c) The icon on the FM-4721 blinks rapidly.

2. OPERATION

Charge the BH-2A battery with the CD-40 Charger Cradle.

2.14.3 VOX feature

The VOX (Voice Operation Transmission) feature provides automatic transmit/receive
switching based on voice input to the microphone. With the VOX feature enabled, you
do not need to press the PTT switch in order to transmit, and it is not necessary to use
a VOX headset in order to utilize VOX operation.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [General Setup] then
press the [SELECT] soft key.

3. Rotate the CH knob to select [Bluetooth] then press
the [SELECT] soft key.

4. Rotate the CH knob to select [VOX FUNCTION] then
press the [SELECT] soft key. Rotate the CH knob to
select the desired VOX function then press the [ENT]
soft key.
[Off]: Disable the VOX feature.
[High]: Activate the VOX feature (VOX gain: High).
[Low]: Activate the VOX feature (VOX gain: Low).

5. Press the [QUIT] soft key several times to exit this menu and return to radio mode.

2-15

2. OPERATION

2.14.4 Battery saver

Enable/Disable the battery saver of the optional BH-2A Bluetooth Headset.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [General Setup] then press the [SELECT] soft key.

3. Rotate the CH knob to select [Bluetooth] then press
the [SELECT] soft key.

4. Rotate the CH knob to select [Save Function] then
press the [SELECT] soft key.

5. Select [On] or [Off] then press the [ENT] soft key.
Press the [QUIT] soft key several times to exit this menu and return to radio oper­ation.
[On]: Activates the Battery Saver in the BH-2A. If there is no signal or key activity
for 20 seconds, the Battery Saver automatically puts the BH-2A to sleep, to con­serve battery life. When a signal is received or the PTT switch is pressed, the BH­2A becomes active. Furthermore, if there is no signal or key activity for 10 min­utes, the BH-2A turns off automatically.
[Off]: Disables the Battery Saver in the BH-2A.

2.15 Voice Scrambler (option)

The optional Voice Scrambler FVP-42 is a 32-code voice scrambler (VS) that installs
in the transceiver, and provides private communications with other FM-4721 equipped
with the FVP-42. Contact your dealer to have a FVP-42 installed.

1. Rotate the CH knob to select the channel to scramble.
Note: CH16 and 70 can not operate the voice scram-

bler.

2. Press the FUNC key then press and hold down the 7/
SQRM key until the [Scrambler] menu appears.

3. Rotate the CH knob to set the desired scrambler code.
The scrambler code can be set from 0 to 31.

4. Press the [ENT] soft key to save the scrambler code
and return to the radio mode. "VS" and scrambler
number (0 - 31) appear on the display.

5. Press the FUNC key followed by the 7/SQRM key to
activate the voice scrambler.

6. Monitor the channel before transmitting.

7. To disable the voice scrambler, press the FUNC key
followed by the 7/SQRM key again. VS and scrambler
number disappear from the display.

2-16

3. DIGITAL SELECTIVE CALLING

3.1 General

NOTICE

This radio is designed to generate a digital
maritime distress and safety call to facilitate
search and rescue. To be effective as a safety
device, this equipment must be used only
within communication range of a shore-based
VHF marine channel 70 distress and safety
watch system. The range of the signal may
vary, but under normal conditions it should be
approximately 20 nautical miles.

Digital Selective Calling (hereafter abbreviated as DSC) is a semi-automated method
of establishing a radio call. DSC has been designated by the International Maritime
Organization (IMO) as an international standard for establishing VHF, MF and HF ra­dio calls. It has also been designated as a part of the Global Maritime Distress and
Safety System (GMDSS). DSC replaces aural watches on distress frequencies and
announces routine and urgent maritime safety information broadcasts.

This system allows mariners to instantly transmit a distress call with GPS position to
the Coast Guard and other vessels within range of the transmission. DSC also allows
mariners to initiate or receive distress, urgency, safety, routine, position request, po­sition transmit and group calls to or from another vessel equipped with a DSC trans­ceiver.

3.2 Maritime Mobile Service Identity (MMSI)

3.2.1 What is an MMSI?

An MMSI is a nine-digit number used on marine transceivers capable of using DSC.
This number is used like a telephone number to selectively call other vessels.

Note: This vessel’s MMSI must be entered into the radio to use the DSC functions.

3.2.2 How to enter your MMSI number

NOTICE

An MMSI can be entered only once. There­fore, be careful not to enter the wrong MMSI
number. If you need to change the MMSI
number after it has been entered, return the
radio to the factory.

3-1

3. DIGITAL SELECTIVE CALLING

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

2. Rotate the CH knob to select [MMSI Setup] then press
the [SELECT] soft key.

3. Enter your MMSI number (nine digits) by the numeric
keys (0 to 9/FOG key). If you enter a wrong digit, press
the [BACK] soft key until the wrong digit is selected
then press the correct numeric key.

4. After you have entered the MMSI number, press and
hold the [ENT] soft key. The message “Input Again” ap­pears.

5. Enter the MMSI number again then press and hold the
[ENT] soft key again to save the MMSI number.

6. Press the [OK] soft key to return to radio operation.

Note: To view your MMSI number, to ensure it is correct,
do steps 1 to 2.

3.3 DSC Distress Alert

The FM-4721 is capable of transmitting and receiving DSC distress alerts. The FM­4721 may be connected to a GPS receiver to also transmit the latitude and longitude
position of the vessel together with the DSC distress alert.

3.3.1 How to transmit a DSC Distress Alert

Note: To transmit a DSC Distress Alert, an MMSI number must be registered in the

transceiver. Refer to section 3.2.2 for how to enter your MMSI number.

How to transmit a DSC Distress Alert without specifying nature of distress

1. Lift the red spring-loaded DISTRESS cover.

2. Press and hold the DISTRESS key (approx. 3 sec­onds). The unit beeps and the display counts down the
time remaining until the distress alert is sent. The
backlight of the display and numeric keys flash while
the display counts down the time remaining.

3. After the distress signal is sent, the transceiver watch­es for a transmission between CH16 and CH70 until
an acknowledgment signal is received. The display
shows "Waiting for ACK" while the equipment waits for
acknowledgement.

3-2

4. If no acknowledgment is received, the distress alert is
repeated in 3.5 - 4.5-minute intervals, until a DSC ac­knowledgment is received.

Note: To turn off the distress alarm until the radio re­transmits the distress call, press the 16/9 key.

Waiting for ACK

3. DIGITAL SELECTIVE CALLING

5. When you receive the DSC distress acknowledgment,
a distress alarm sounds and CH16 is automatically se-

Received DISTRESS ACK

lected. The display shows the MMSI of the ship re­sponding to your distress and the applicable

Acknowledged

acknowledgement message.
"Received DISTRESS ACK": Acknowledgment signal is received.
"Received RELAY ACK": Relay acknowledgment signal is received from another
vessel or coast station.

6. Press the PTT switch and state your name, vessel name, number of persons on
board and the distress situation, then say over. Wait for a reply from the acknowl­edging ship.

7. To conclude both voice communications and the distress alert sequence, press
the [OK] soft key.

How to transmit a DSC Distress Alert with nature of distress specified

The FM-4721 is capable of transmitting a DSC Distress Alert with the following "Nature
of Distress" categories: Undesignated, Fire, Flooding, Collision, Grounding, Capsiz­ing, Sinking, Adrift, Abandoning, Piracy, and MOB (Man Overboard).

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Distress Alert MSG] then press the [SELECT] soft
key.

3. Press the [NATURE] soft key to show the [!NATURE
OF!] menu.

4. Rotate the CH knob to select the desired nature of dis­tress category then press the [SELECT] soft key. For
example, select Fire.

5. Lift the red spring-loaded DISTRESS cover.

6. Press and hold the DISTRESS key (approx. 3 sec­onds). The unit beeps and the display counts down the
time remaining until the distress alert is sent. The back­light of the display and numeric keys flash while the dis­play counts down the time remaining.

7. When the distress signal is sent, the transceiver
watches for a transmission between CH16 and CH70
until an acknowledgment signal is received. The dis­play shows "Waiting for ACK" while the equipment

Waiting for ACK

waits for acknowledgement. If no acknowledgment is
received, the DSC Distress Alert call is repeated in 3.5 - 4.5-minute intervals until
an acknowledgment is received.

Note: To turn off the distress alarm until the radio retransmits the distress call,
press the 16/9 key.

8. When you receive the DSC distress acknowledgment,
a distress alarm sounds and CH16 is automatically se­lected. The display shows the MMSI of the ship re­sponding to your distress and the applicable
acknowledgement message.
"Received DISTRESS ACK": Acknowledgment signal
is received.

Received DISTRESS ACK

Acknowledged

3-3

3. DIGITAL SELECTIVE CALLING

"Received RELAY ACK": Relay acknowledgment signal is received from another
vessel or coast station.

9. Press the PTT switch and state your name, vessel name, number of persons on
board and the distress situation, then say over. Wait for a reply from the acknowl­edging ship.

10. To conclude both voice communications and the distress alert sequence, press
the [OK] soft key.

How to transmit a DSC Distress Alert with manual position of input

If no position data is available at the time of distress, insert the latitude and longitude
position of your vessel manually in the DSC Distress Alert.

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Distress Alert MSG]
then press the [SELECT] soft key.

3. Press the [POS/TM] soft key.

4. Enter the latitude and longitude of your vessel and
your local time in 24-hour notation, using the numeric
keys (0 to 9/FOG key).
To select North (N) press the 6/DW key, South (S)
press the 7/SQRM key, East (E) press the 3/SCAN
key, or West (W) press the 9/FOG key. You may back­space the cursor by pressing the [BACK] soft key.

5. Press and hold the [ENT] soft key for two seconds to
save the position entered.

Press [POS/TM]
soft key.

Enter position and
position time.

6. Lift the red spring-loaded DISTRESS cover.

7. Press and hold the DISTRESS key (approx. 3 sec­onds). The unit beeps and the display counts down the
time remaining until the distress alert is sent. The
backlight of the display and numeric keys flash while
the display counts down the time remaining.

8. When the distress signal is sent, the transceiver
"watches" for a transmission between CH16 and
CH70 until an acknowledgment signal is received. The
display shows "Waiting for ACK" while the equipment
waits for acknowledgement. If no acknowledgment is
received, the distress call is repeated in 3.5 - 4.5­minute intervals until an acknowledgment is received.
Note: To turn off the distress alarm until the radio retransmits the distress call,
press the 16/9 key.

9. When you receive the DSC distress acknowledgment,
a distress alarm sounds and CH16 is automatically se-

Received DISTRESS ACK

lected. The display shows the MMSI of the ship re­sponding to your distress and the applicable

Acknowledged

acknowledgement message.
"Received DISTRESS ACK": Acknowledgment signal is received.
"Received RELAY ACK": Relay acknowledgment signal is received from another
vessel or coast station.

3-4

3. DIGITAL SELECTIVE CALLING

10. Press the PTT switch and state your name, vessel name, number of persons on
board and the distress situation, then say over. Wait for a reply from the acknowl­edging ship.

11. To conclude both voice communications and the distress alert sequence, press
the [OK] soft key.

How to pause a DSC Distress Alert

After a DSC Distress Alert is transmitted, the DSC Distress Alert is repeated in 3.5 -

4.5-minute intervals until the call is canceled by the user or until the radio is turned on

and off again. The FM-4721 has a provision to suspend (Pause) the retransmitting of
the distress call.

1. After the distress alert is transmitted, the radio shows
the topmost display at right.
“TX in: 02:25” is the time remaining until the radio re­transmits the DSC Distress Alert.

Waiting for ACK

2. To suspend re-transmitting the DSC Distress Alert,
press the [PAUSE] soft key.

3. To resume counting down to transmit the DSC Dis­tress Alert, press the [RESUME] soft key.

How to cancel a DSC Distress Alert

If you sent a DSC Distress Alert unintentionally, you must transmit a message to other
vessels to cancel that distress alert. Press the [CANCEL] soft key then press [YES]
soft key.

Press [CANCEL]

soft key

3.3.2 How to receive a DSC Distress Alert

1. When a DSC Distress Alert is received, the emergency
alarm sounds. Press any key to stop the alarm.

2. The display shows the position of the vessel in dis­tress. To show additional information of the vessel in
distress, rotate the CH knob clockwise (refer to the
second display).
On the display, you should see three soft keys.
[ACCEPT]: Accept the DSC Distress Alert call and
switch to CH16.
[PAUSE]: Temporarily disable automatic switching to
CH16.
[QUIT]: Quit the automatic switching to CH16 and revert to the last selected work­ing channel.

Note 1: If no key is pressed within 10 seconds, the radio automatically selects
CH16.

Note 2: You must continue to monitor CH16, as a coast station may require as­sistance in the rescue attempt.

Rotate CH knob to
show additional info.

3-5

3. DIGITAL SELECTIVE CALLING

3.4 All Ships Call

The All Ships call function establishes contact with DSC-equipped vessels without
having their MMSI in the directory. Also, priority for the call can be designated as ur­gency or safety.

Urgency Call: This type of call is used when a vessel may not truly be in distress, but
has a potential problem that may lead to a distress situation. This call is the same as
saying "Pan-Pan-Pan" on CH16.

Safety Call: Used to transmit boating safety information to other vessels. This mes­sage usually contains information about an overdue boat, debris in the water, loss of
a navigation aid, or an important meteorological message. This call is the same as
saying "Securite, Securite, Securite".

3.4.1 How to transmit an All Ships call

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [All Ships] then press the
[SELECT] soft key.

3. Rotate the CH knob to select the nature of call ([Safe­ty] or [Urgency]), then press the [SELECT] soft key.

4. Rotate the CH knob to select the operating channel
you want to communicate on then press the [SELECT]
soft key.

5. Press the [YES] soft key to transmit the All Ships call.

6. After the All Ships call is transmitted, the transceiver
switches to the selected channel.

7. Listen to the channel to make sure it is not busy, then
key the microphone and say "Pan-Pan-Pan" or "Secu­rite, Securite, Securite" depending on the priority of the
call.

8. Press the [QUIT] soft key to exit the [All Ships Call]
menu.

3-6

3.4.2 How to receive an All Ships call

1. When an All Ships call is received, an emergency alarm sounds. The display
shows the MMSI of the vessel transmitting the All Ships call and the radio changes
to the requested channel after 10 seconds.

2. Press any key to stop the alarm.

3. Monitor the requested channel until the all ships voice
communication is completed.
The display shows three soft keys:
[ACCEPT]: Accept the DSC All Ship call and to switch
to requested channel.
[PAUSE]: Temporarily disable automatic switching to
the requested channel. (In some cases automatically
switching to a requested channel might disrupt impor­tant ongoing communications. This feature allows
commercial users to suspend channel switching and
stay on the working channel selected before the All Ships call was received.)
[QUIT]: Quit the automatic channel switching and revert to the last selected work­ing channel.

Note: If no key is pressed within 10 seconds the radio automatically changes to
the requested channel.

3. DIGITAL SELECTIVE CALLING

4. Press the [QUIT] soft key to return to the channel display.

3.5 Individual Call

The Individual call contacts another vessel with a DSC VHF radio and automatically
switches the receiving radio to a desired communications channel. This feature is sim­ilar to calling a vessel on CH16 and requesting to go to another channel. Up to 80 in­dividual contacts can be programmed, in the Individual Directory.

3.5.1 How to register DSC stations to the Individual Directory

The Individual Directory allows you to save a vessel or person's name and the MMSI
number associated with vessels you wish to transmit Individual calls, auto polling, po­sition request, and position report transmissions.

To transmit an Individual call you must program this directory with information of the
persons you wish to call, similar to how you program the telephone directory in a cel­lular phone.

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

2. Rotate the CH knob to select the [DSC Setup] menu
then press the [SELECT] soft key.

3. Select [Individual Directory] with the CH knob then
press the [SELECT] soft key.

4. Select [ADD] with the CH knob then press the [SE­LECT] soft key.

3-7

3. DIGITAL SELECTIVE CALLING

5. Enter the first letter of the name of the vessel or person you want to reference in
the directory.
Example: Press the 8/PA key repeatedly to toggle among the seven available
characters associated with that key: 8 → T → U → V → t → u → v → 8...

6. Press the [ENT] soft key to save the first letter in the
name and move to the next letter to the right.

7. Repeat steps 5 and 6 to complete the name. The
name can have a maximum of 11 characters. Use the
[ENT] soft key to move to the next space. This method
can also be used to enter a blank space in the name. If you enter a wrong char­acter, press the [BACK] soft key until the wrong character is selected, then enter
the correct character.

8. After the eleventh letter or space has been entered, press and hold the [ENT] soft
key to advance to the ID line, where you enter the MMSI number.

9. Enter the MMSI number (nine digits). If you enter a wrong digit, press the [BACK]
soft key until the wrong digit is selected, then press the correct numeric key.

10. After you have entered the MMSI number, press and hold the [ENT] soft key to
save the data.

11. Press the [QUIT] soft key several times to return to radio operation.

3.5.2 How to select the Individual call reply method

The DSC Individual call requests you to switch to a working channel for voice commu­nications. The radio can automatically or manually switch to the channel. For manual,
the default setting, the MMSI of the calling vessel is shown, allowing you to see who
is calling. This function is similar to the caller ID feature on a cellular phone.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then
press the [SELECT] soft key.

3. Select [Individual Reply] with the CH knob then press
the [SELECT] soft key.

4. Rotate the CH knob to select [Automatic] or [Manual]
then press the [ENT] soft key to save the setting.

5. Press the [QUIT] soft key several times to return to radio operation.

3-8

3. DIGITAL SELECTIVE CALLING

3.5.3 How to select the Individual call acknowledge method

The radio can be setup to transmit a reply automatically (default setting) or set so the
radio does not reply to an Individual call.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then
press the [SELECT] soft key.

3. Select [Individual Ack] with the CH knob then press the
[SELECT] soft key.

4. Rotate the CH knob to select [Able to Comply] or [Un­able] then press the [ENT] soft key to save the selected setting.

5. Press the [QUIT] soft key several times to return to radio operation.

3.5.4 Individual/Group call ringer

When an Individual call or Group call is received, the radio produces a ringing sound
for two minutes (default setting). You can select the Individual call ringer time and turn
the ringer on or off as desired.

How to set the individual/Group call ringer time

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then
press the [SELECT] soft key.

3. Select [Individual Ring] with the CH knob then press
the [SELECT] soft key.

4. Rotate the CH knob to select a ringing time then press
the [ENT] soft key to save the setting.

5. Press the [QUIT] soft key several times to return to radio operation.

How to turn the ringer off

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then
press the [SELECT] soft key.

3. Select [DSC Beep] with the CH knob then press the
[SELECT] soft key.

4. Rotate the CH knob to select [Individual] if you wish to
disable the Individual call ringer, or [Group] if you wish to disable the Group call
ringer.

5. Press the [ENT] soft key

6. Rotate the CH knob to select [Off] then press the [ENT] soft key to save the set­ting.

7. Press the [QUIT] soft key several times to return to radio operation.

To turn the ringer on, select [On] at step 6 in the procedure.

3-9

3. DIGITAL SELECTIVE CALLING

3.5.5 How to transmit an Individual call

The Individual call lets you contact a vessel that has a DSC radio. This feature is sim­ilar to calling a vessel on CH16 and requesting to go to another channel.

Transmit to vessel registered in the Individual Directory

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Individual] then press
the [SELECT] soft key.

3. Rotate the CH knob to select who you want to contact
then press the [SELECT] soft key.

4. Rotate the CH knob to select the operating channel
you want to communicate on, then press the [SE­LECT] soft key.

5. Press the [YES] soft key to transmit the individual DSC
signal.

6. When an Individual call acknowledgment is received,
the established channel is automatically changed to
the channel which is selected at step 4 above and a
ringing tone sounds.

7. Press the [QUIT] soft key to listen to the channel to
make sure it is not busy, then press the microphone's
PTT switch and talk into the microphone to the other
vessel.

Transmit to vessel not registered in the Individual
Directory

You can make an Individual call by using a manually entered MMSI number.

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Individual] then press
the [SELECT] soft key.

3. Press the [NEW ID] soft key, select [MANUAL] with the
CH knob then press the [SELECT] soft key.

4. Enter the MMSI number (nine digits). (If you enter a
wrong digit, press the [BACK] soft key until the wrong
digit is selected, then press the correct numeric key.)

3-10

5. After you have entered the MMSI number, press and
hold the [SELECT] soft key.

6. Rotate the CH knob to select the operating channel
you want to communicate on then press the [SELECT]
soft key.

7. Press the [YES] soft key to transmit the individual DSC
signal.

8. When an Individual call acknowledgment is received,
the established channel is automatically changed to
the channel which is selected at step 6 above and a
ringing tone sounds.

9. Press the [QUIT] soft key to listen to the channel to
make sure it is not busy, then press the microphone's
PTT switch and talk into the microphone to the other
vessel.

3.5.6 How to receive an Individual call

3. DIGITAL SELECTIVE CALLING

When an individual DSC call is received, the radio proceeds according to how it is set
for individual call reply. In automatic reply, the radio automatically responds (default
setting) to the calling ship and switches to the requested channel for voice communi­cations. For manual reply, the operator selects whether to reply to the call or not.

Automatic reply

1. When an Individual call is received, the Individual call ringing alarm sounds.
Push any key to stop the alarm. The radio automati­cally switches to the requested channel. The display
shows the MMSI of the vessel calling.

2. Press any key to stop the alarm.

3. Press the [QUIT] soft key to return to radio operation.

4. Press the microphone's PTT switch and talk into the
microphone to the other vessel.

Rout ine

3-11

3. DIGITAL SELECTIVE CALLING

Manual reply

1. When an Individual call is received, the Individual call ringing alarm sounds.
Push any key to stop the alarm. The display shows
the MMSI of the vessel calling and three soft keys:
[ACCEPT], [PAUSE], and [QUIT].
ACCEPT: Continue with the call. You can change
the channel if necessary.
PAUSE: Pause the call. The radio shows the stand­by display with the indication "INDIVIDUAL Pausing" flashing. You can resume
the call by pressing the [RESUME] soft key.
QUIT: Quit the call.

2. Press the [ACCEPT] soft key and the screen shown below appears. Follow the
appropriate instructions in the table below.

Individual Call

ABLE UNABLE

Individual Call

ACCEPT PAU SE

ABLE to reply UNABLE to reply

1) Press the [ABLE] soft key.

Able to comply

Transmit?

YES CHG CH

NO

2) Do one of the following:
a) Transmit on the channel select-
ed: Press the [YES] soft key. Go to
step 5). b) Transmit on a different
channel: Press the [CHG CH] soft
key to show the channel selection
screen.

3) Use the CH knob to select a channel
then push the [SELECT] soft key. For
manual channel input, press the
[MANUAL] soft key.

4) The display shown after step 1) ap­pears; press the [YES] soft key to
transmit.

5) When the message "Connected" ap­pears, press the microphone's PTT
switch and talk into the microphone
to the other vessel.

Press the [UNABLE] soft key. The stand­by display appears after completion of
the transmission.

3-12

3.6 DSC Log

The FM-4721 logs transmitted calls, received distress calls, and Individual calls. The
DSC log feature is similar to an answering machine where calls are recorded for re-

view. A icon appears in the log to indicate unread received call. The FM-4721 can
store the latest 24 transmitted calls, the latest 27 distress calls, and the latest 64 other
calls ([Individual], [Group], [All Ship], etc.).

3.6.1 Transmitted call log

The transmitted call log stores all transmitted DSC calls.
Calls can be made from the log.

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [DSC Log] menu then
press the [SELECT] soft key.

3. Rotate the CH knob to select [Transmitted Log] then
press the [SELECT] soft key.

4. Rotate the CH knob to select the station (name or
MMSI number) then press the [SELECT] soft key to re­view details for the selected station.

5. Press the [CALL] soft key to retransmit the call, if de­sired, or the [QUIT] soft key to close the log.

3. DIGITAL SELECTIVE CALLING

Status: ACKed

3.6.2 Distress log

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [DSC Log] menu then
press the [SELECT] soft key.

3. Rotate the CH knob to select [Distress Log] then press
the [SELECT] soft key.

4. Rotate the CH knob to select the station (name or
MMSI number) you want to review the distress call
then press the [SELECT] soft key to show call details.

5. Press the [QUIT] soft key to close the log.

3.6.3 Other call log

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [DSC Log] menu then
press the [SELECT] soft key.

3. Rotate the CH knob to select [Other Call Log] then
press the [SELECT] soft key.

4. Rotate the CH knob to select the station (name or
MMSI number) you want to review and/or call back
then press the [SELECT] soft key.

Status: ACKed

5. Press the [CALL] soft key to call back, if desired, or the
[QUIT] soft key to close the log.

3-13

3. DIGITAL SELECTIVE CALLING

3.6.4 How to delete calls from a log

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [DSC Log] menu then
press the [SELECT] soft key.

3. Rotate the CH knob to select [LOG Delete] menu then
press the [SELECT] soft key.

4. Rotate the CH knob to select the category ([Transmit­ted Log], [Distress Log], or [Other Call Log]) to delete
then press the [SELECT] soft key. For example, select
the [Distress Log].

5. Select [All Log Delete] or [View Log List] then press the
[SELECT] soft key. Do one of the following:

• Delete all entries from selected log

Select [All Log Delete] with the CH knob, press the
[SELECT] soft key, then press the [OK] soft key.

• Delete individual log entry

Select [View Log List] with the CH knob then press
the [SELECT] soft key. Rotate the CH knob to select
the station (name or MMSI number) to delete then
press the [DELETE] soft key. The display shows
"Are your sure?". Press the [OK] soft key.

Press

[DELETE]

soft key.

6. Press the [QUIT] soft key several times to return to radio operation.

Press

[OK]

soft key.

3.7 Group Call

A Group call allows the user to contact a group of specific vessels (example members
of a yacht club) using DSC radios that have a Group call function. When a Group call
is sent, all DSC radios in the group automatically switch to the channel specified in the
call to prepare for voice communications. This function is useful for yacht clubs and
vessels traveling together that want to collectively make announcements on a prede­termined channel. Up to 32 Group call MMSIs can be programmed.

3.7.1 How to register DSC stations to the Group Directory

For this function to operate, the same Group call MMSI must be registered into all the
DSC VHF radios within the group of vessels that use this feature. To understand
Group call MMSI programming, first a ship MMSI has to be understood.

3-14

Ship MMSI: The first three digits are called an MID (Maritime Identification Digits) and

identify the country where the ship’s MMSI is registered. The last six digits are specific
to the ship’s ID. For example, if the MMSI is "366123456", "366" is the MID and
"123456" is the ship’s MMSI.

3. DIGITAL SELECTIVE CALLING

Group MMSI:

• Group MMSI numbers are not assigned by the FCC or other organizations licensed
to assign ship MMSI.

• The first digit of a Group call MMSI is always set to "0" as required by international
regulations. All FURUNO radios automatically have “0” as the first digit in a Group
call MMSI.

• The USCG recommends programming the MID of a ship MMSI into the second,
third and fourth digits of the Group call MMSI as it denotes the area the ship is lo­cated.

• The last five digits are decided by persons in the group. This is an important step as
all radios in the group must contain the same Group call MMSI so they can contact
one another. There is a chance that another group of vessels has the same Group
call MMSI as yours. If this happens, simply change one or more of the last five digits
of the Group call MMSI.

1. Press and hold down the CALL/MENU key until the

[Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then

press the [SELECT] soft key.

3. Select [Group Directory] with the CH knob then press

the [SELECT] soft key.

4. Select [Add] with the CH knob then press the [SE-

LECT] soft key.

5. Enter the first letter of the name of the group you want

to reference in the directory.
Example: Press the 4/DIM key repeatedly to toggle
among the seven available characters associated with
that key: 4 → G → H → I → g → h → i → 4...

6. Press the ENT key to save the first letter in the name and move to the next letter

to the right.

7. Repeat steps 5 and 6 to complete the name. The name can have a maximum of

11 characters. Press the ENT key to move to the next space. This method can
also be used to enter a blank space in the name. If you enter a wrong character,
press the [BACK] soft key until the wrong character is selected, then enter the cor­rect character.

8. After the name has been entered, press and hold the ENT key to advance to the

Group call MMSI number entry (ID line).

9. Enter the MMSI number (nine digits: first digit permanently set to "0"). If you enter

a wrong digit, press the [BACK] soft key until the wrong digit is selected, then
press the correct numeric key.

10. Press and hold the ENT key to save the data.

11. Press the [QUIT] soft key several times to return to radio operation.

3-15

3. DIGITAL SELECTIVE CALLING

3.7.2 How to transmit a Group call

Transmit Group call to group registered in the Group Directory

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Group] then press the
[SELECT] soft key to show the [Group Directory]
menu.

3. Rotate the CH knob to select the Group call name you
want to contact then press the [SELECT] soft key.

4. Rotate the CH knob to select the operating channel
you want to communicate on then press the [SELECT]
soft key.

5. Press the [YES] soft key to transmit the Group call sig­nal.

6. The display shows "Transmitting" while the Group call
signal is being sent.

7. After the Group call is transmitted, all the radios in the
Group call automatically switch to the designated
channel.

8. Listen to the channel to make sure it is not busy, then
press the microphone's PTT switch and call the other
vessel you desire to communicate with.

Transmit Group call to group not registered in the
Group Directory

This feature allows you to contact a group of vessels by entering their Group call MMSI
manually.

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Group] then press the
[SELECT] soft key to show the [Group Directory]
menu.

3. Press the [New ID] soft key.

4. Select [Manual] with the CH knob then press the [SE­LECT] soft key.

5. Enter the MMSI number (nine digits: first digit perma­nently set to "0"). If you enter a wrong digit, press the
[BACK] soft key until the wrong digit is selected, then
press the correct numeric key.

3-16

6. Press and hold the [SELECT] soft key.

7. Rotate the CH knob to select the operating channel you want to communicate on
then press the [SELECT] soft key.

Select CH;

press [SELECT]

soft key.

8. Press the [YES] soft key to transmit the Group call sig­nal.

9. The display shows "Transmitting" while the Group call
signal is being sent.

10. After the Group call is transmitted, all the radios in the
group automatically switch to the designated channel.

11. Listen to the channel to make sure it is not busy, then
press the PTT button and talk into the microphone to
the Group call of vessels.

3.7.3 How to receive a Group call

3. DIGITAL SELECTIVE CALLING

1. When a Group call is received, the FM-4721 releases
the ringer alarm and the radio automatically switches
to the requested channel.

2. Press any key to stop the alarm.

PAUSEACCEPT

3. Follow the procedure in step 3 in section 3.4.2.

4. Monitor the channel for the person calling the group for
a message.

5. If you want to respond, monitor the channel to make
sure it is clear, then press the microphone's PTT
switch and talk into the microphone to the group of vessels.

6. Press any key to return to radio operation.

Note: After a Group call is received, the time the call was made and the ship’s MMSI
or vessels name that made the call appear on the display.

3-17

3. DIGITAL SELECTIVE CALLING

3.8 Position Request Call

Advancements in DSC have made it possible to poll the location of another vessel and
show the position of that vessel on the display of the FM-4721. FURUNO has taken
this feature one step further. If a compatible GPS chart plotter is connected to the FM­4721, the polled position of the vessel is shown on the display of the GPS chart plotter
making it easy to navigate to the location of the polled vessel.

Note: The other vessel must have an operating GPS receiver connected to its DSC
radio and must not have its radio set to deny position requests. (Refer to section 3.5
to enter information into the individual directory).

3.8.1 How to set up a position request reply

The FM-4721 automatically (default setting) or manually transmits your position when
requested by another vessel. This selection is important if you are concerned about
someone polling the position of your vessel that you may not want to. In the manual
mode the MMSI or the name of the person making the request appears on the display,
allowing you to choose to transmit your position to the requesting vessel or not.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then press the [SELECT] soft
key.

3. Select [Position Reply] with the CH knob then press
the [SELECT] soft key.

4. Select [Automatic] or [Manual] then press the [ENT]
soft key to save setting.[Automatic]: The radio auto­matically transmits your vessel’s position to the re­questing vessel. [Manual]: The display of the FM-4721 shows who is requesting
the position. Press the [YES] soft key to transmit your position to the requesting
vessel.

5. Press the [QUIT] soft key several times to return to radio operation.

3.8.2 How to set up the position request ringer

The position request ringer, which beeps when a position
request is received, can be turned off.

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

3-18

2. Rotate the CH knob to select [DSC Setup] menu then
press the [SELECT] soft key.

3. Select [DSC Beep] with the CH knob then press the
[SELECT] soft key.

4. Select [POS Request] with the CH knob then press the [ENT] soft key.

5. Select [Off] with the CH knob then press the [ENT] soft key to save the setting.

6. Press the [QUIT] soft key several times to return to radio operation.

To re-enable the ringer tone, Select [On] in step 5 of the procedure.

Note: When the [Position Reply] is set to [Automatic], the position request ringer does
not sound regardless of the setting in this procedure.

3. DIGITAL SELECTIVE CALLING

3.8.3 How to transmit a Position Request call to another vessel

Request position of vessel registered in the Individual Directory

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [POS Request] then
press the [SELECT] soft key.

3. Rotate the CH knob to select a name then press the
[SELECT] soft key. The Category screen appears.

4. Rotate the CH knob to select [.Routine] or [Safety]
then press the [SELECT] soft key.

5. Press the [YES] soft key to transmit the position re­quest DSC call. When the FM-4721 receives the posi­tion from the polled vessel it appears on the display
and is also transferred and shown on a GPS chart plot­ter (if connected to the FM-4721).

6. Press the [QUIT] soft key to return to radio operation.

Request position of vessel not registered in the Individual Directory

ROUTINE

Safety

RESEND

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [POS Request] then
press the [SELECT] soft key to show the [POS Re­quest Call] display.

3. Press the [NEW ID] soft key to show the following dis­play.

4. Select [Manual] with the CH knob then press the [SE­LECT] soft key.

5. Enter the MMSI number (nine digits) which you want to
contact. If you enter a wrong digit, press the [BACK]
soft key until the wrong digit is selected, then press the
correct numeric key.

6. After you have entered the MMSI number, press and
hold the [SELECT] soft key. The Category screen ap­pears.

7. Rotate the CH knob to select [Routine] or [Safety] then
press the [SELECT] soft key.

8. Press the [YES] soft key to transmit the position re­quest DSC call.

ROUTINE

Safety

9. The position of the polled vessel appears on the dis­play and is also transferred to the GPS chart plotter (if
connected to the FM-4721).

10. Press the [QUIT] soft key to return to radio operation.

RESEND

3-19

3. DIGITAL SELECTIVE CALLING

3.8.4 When you receive a Position Request call

When you receive a Position Request call from another vessel, a ringing alarm sounds
and "POS Request" appears on the display. The FM-4721 automatically or manually
replies to the request depending on the setting of [Position Reply] in the [DSC Setup]
menu.

Automatic transmission of your position

1. When you receive a Position Request call, position coordinates are automatically
transmitted to the vessel that requested your vessel’s position.

2. 10 seconds after your position is transmitted, the radio automatically changes to
the requested channel. Press the [QUIT] soft key to exit from the position request
display.

Manual transmission of your position

1. When a Position Request call is received from another
vessel, the display looks something like the one shown
below.

2. A ringing alarm sounds four times. To transmit your
vessel’s position to the requesting vessel, press the
[REPLY] soft key. Or to exit from the position request
display without transmitting position, press the [QUIT]
soft key.

3.9 Position Report Call

A Position Report call transmits your position to another vessel. Your vessel must
have an operating GPS receiver connected to the FM-4721 to transmit your position.
The MMSI of the vessel can be one you have programmed, or entered manually.

3.9.1 How to enable, disable the position report ringer

A ringer sounds when you receive a request for your position. Enable or disable the
position report ringer as follows:

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then press the [SELECT] soft
key.

3. Select [DSC Beep] with the CH knob then press the
[SELECT] soft key.

4. Rotate the CH knob to select [POS Report] then push
the [ENT] soft key.

5. Rotate the CH knob to select [Off] then push the [ENT]
soft key.

6. Press the [ENT] soft key to save the selected setting.

3-20

7. Press the [QUIT] soft key several times to return to radio operation.

To re-enable the ringer tone, select [On] at step 4 in the procedure.

3.9.2 How to transmit a Position Report call

Transmit your position to vessel registered in the Individual Directory

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [POS Report] then press
the [SELECT] soft key.

3. Rotate the CH knob to select a name in the directory
then press the [SELECT] soft key. The Category
screen appears. Rotate the CH knob to select a cate­gory then press the [SELECT] soft key.

4. Press the [YES] soft key to transmit your position to
the selected vessel.

5. Press the [QUIT] soft key to return to radio operation.

Transmit your position to vessel not registered in the Individual Directory

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [POS Report] then press
the [SELECT] soft key.

3. DIGITAL SELECTIVE CALLING

ROUTINE

Safety

3. Press the [New ID] soft key.

4. Select [Manual] with the CH knob then press the [SE­LECT] soft key.

5. Enter the MMSI number that you want to contact. If
you enter a wrong digit press the [BACK] soft key until
the wrong number is selected, then press the correct
numeric key.

6. Press and hold the [SELECT] soft key. The Category
screen appears. Rotate the CH knob to select a cate­gory then press the [SELECT] soft key.

7. Press the [YES] soft key to transmit your position to
the selected vessel.

8. Press the [QUIT] key to return to radio operation.

ROUTINE

Safety

3-21

3. DIGITAL SELECTIVE CALLING

3.9.3 When you receive a Position Report call

When another vessel transmits its position to the FM-4721 the following occurs:

1. The ringer sounds and NMEA sentences DSC, DSE
are outputted to a GPS chart plotter (if connected to
the FM-4721).

2. Press the CLR/WX key to stop the ringer.

3. Rotate the CH knob to see the position information of
the vessel then press the [SELECT] soft key.

4. Press the [QUIT] soft key to close the display and re­turn to radio operation.

3-22

3. DIGITAL SELECTIVE CALLING

3.10 Auto DSC Polling

The FM-4721 has the capability to automatically track four stations programmed into
the individual directory.

The following procedure allows the time interval between position requests to be set­up.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu then
press the SELECT soft key.

3. Select [Auto POS Interval] with the CH knob then
press the [SELECT] soft key.

4. Rotate the CH knob to select the desired interval time
(1, 2, 3, 4, 5, 10, 20, 30, and 40 minutes) and press the [ENT] soft key.

5. Press the [QUIT] soft key numerous times to exit to the radio mode.

3.10.1 Selecting stations to be automatically polled (tracked)

Note: The radio uses the individual directory to select stations. Refer to

paragraph 3.5.1 and enter MMSI of stations you want to poll before proceeding.

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Auto POS Polling], then
press the [SELECT] soft key.

3. Rotate the CH knob to select the [Select Address] then
press the [SELECT] soft key. The radio shows four
calling stations to be selected, select [Call 1] and press
the [SELECT] soft key.

4. The radio shows the stations programmed in the Indi­vidual directory. Rotate the CH knob to select the de­sired station and press the [SELECT] soft key.

5. Repeat steps 3 and 4 for [Call 2], [Call 3] and [Call 4]
entries.

6. When finished, press the [QUIT] soft key numerous
times to exit to the radio mode.

3-23

3. DIGITAL SELECTIVE CALLING

3.10.2 Enable/Disable auto DSC polling

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [Auto POS Polling] then
press the [SELECT] soft key.

3. Rotate the CH knob to select [Activation] then press
the [SELECT] soft key.

4. Select [Start] to enable transmissions to the stations or
[Stop] to disable transmissions to the stations.

5. Press the [ENT] soft key.

6. Press the [QUIT] soft key several times to exit to the radio mode.

Note 1: “ ” appears on the screen when Auto DSC polling is active.

Note 2: When the radio receives position reports from a called vessel, the NMEA 0183

DSC and DSE sentences are output to a GPS chart plotter.

A

3.11 Auto CH Switch Time

This feature allows you to change the switching time which is automatically shifted to
the requested channel when the Distress Alert, All Ships Call, and Group Call are re­ceived.

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

2. Rotate the CH knob to select [DSC Setup] menu.

3. Press the [SELECT] soft key, then select [Auto CH
Switch Time] with the CH knob.

4. Press the [SELECT] soft key, then rotate the CH knob
to the desired time.

5. Press the [ENT] soft key to store the selected setting.

6. Press the [QUIT] soft key several times to return to ra­dio operation.

SWITCH

Switch

3-24

3. DIGITAL SELECTIVE CALLING

3.12 DSC Test

This function contacts another DSC-equipped vessel to test your DSC radio for proper
operation. To use this feature, the radio that you transmit the test call to must have the
DSC test feature.

To do the DSC test, enter the MMSI of another vessel. The MMSI can be one you have
programmed into the individual directory or a manually entered one.

3.12.1 How to make a DSC test call with MMSI in the Individual Direc­tory

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [DSC Test] then press

the [SELECT]soft key.

3. Rotate the CH knob to select a vessel (station) then

press the [SELECT] soft key.

4. Press the [YES] soft key to transmit the DSC test call

to the other vessel.

After the radio receives a test call reply from the vessel, the
radio rings and shows the “TEST ACK” display, which con­firms the radio you called received the test call.

Category: Safety

Category: Safety

3-25

3. DIGITAL SELECTIVE CALLING

3.12.2 How to make a DSC test call by manually entering MMSI

1. Press the CALL/MENU key to show the [DSC Menu].

2. Rotate the CH knob to select [DSC Test] then press the [SELECT] soft key.

3. Rotate the CH knob to select [Manual] then press the [SELECT] soft key.

4. Enter the MMSI number which you want to contact.

5. Press and hold the [SELECT] soft key to show the
[Test Call] page.

6. Press the [YES] soft key to transmit the DSC test call
to the other vessel.

After the radio receives a test call reply from the vessel, the
radio rings and shows the “TEST ACK” display, which con­firms the radio you called received the test call.

Category: Safety

Category: Safety

3-26

4. GENERAL SETUP

The procedures in this chapter can also be done from the HS-4721 Handset.

4.1 Display Contrast

The display contrast can be adjusted to suit environmental conditions.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [General Setup] menu then press the [SELECT] soft
key.

3. Rotate the CH knob to select [Contrast] then press the [SELECT] soft key.

4. Rotate the CH knob to set the contrast then press the
[ENT] soft key to store the selected level. The contrast
level can be set from 0 to 31.

5. Press the [QUIT] soft key several times to return to ra­dio operation.

4.2 Time Offset

If you want to use local time, set the time difference between UTC and local time. The
offset is added or subtracted from the time received from the GPS receiver or chart
plotter. Time is only displayed when a GPS receiver or Chart Plotter is connected.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

3. Select [Time Offset] with the CH knob then press the [SELECT] soft key.

4. Rotate the CH knob to select time offset of your loca­tion then press the [ENT] soft key to store the time off­set. Set "00:00" to use UTC (Universal Time
Coordinated or GPS Satellite Time).

5. Press the [QUIT] soft key several times to return to ra­dio operation.

4-1

4. GENERAL SETUP

4.3 Time Area

Time can be shown in UTC time or local time with the offset.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Rotate the CH knob to select [Time Area] then press
the [SELECT] soft key.

4. Rotate the CH knob to select [UTC] or [Local] then
press the [ENT] soft key to store the selected setting.

5. Press the [QUIT] soft key several times to return to radio operation.

4.4 Time Notation

You can show time in 12-hour or 24-hour format.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

3. Rotate the CH knob to select [Time Display] then press
the [SELECT] soft key.

4. Rotate the CH knob to select [12 Hour] or [24 Hour]
then press the [ENT] soft key to store the selected set­ting.

5. Press the [QUIT] soft key several times to return to radio operation.

4.5 Units of Measurement

Select the unit of measurement for speed and distance.

Note: A GPS receiver must be connected to the radio to show speed and distance.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

3. Rotate the CH knob to select [Unit of Measure] then press the [SELECT] soft key.

4. Rotate the CH knob to select [Speed] or [Distance] then press the [SELECT] soft
key.

4-2

5. Rotate the CH knob to select a unit. Available selections are [KTS (Knots)], [MPH
(Mile/Hour)] or [KMH (Kilo-Meter/Hour)] for speed, and [NH (Nautical Mile)], [SM
(Statute Mile)] or [KM (Kilo-Meter)] for distance.

6. Press the [ENT] soft key to store the selected setting.

7. Press the [QUIT] soft key several times to return to radio operation.

4. GENERAL SETUP

4.6 COG Display Format

GPS COG (Course Over Ground) can be shown in True or Magnetic.

Note: A GPS must be connected to the radio to be able to show COG.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Rotate the CH knob to select [Magnetic] then press the
[SELECT] soft key.

4. Rotate the CH knob to select [True] or [Magnetic] then
press the [ENT] soft key to store the selected setting.

5. Press the [QUIT] soft key several times to return to radio operation.

4.7 Manual Input of the Position (Lat/Lon)

You may transmit the Latitude/Longitude of your vessel manually if you don’t have a
GPS receiver or something is wrong with your GPS receiver.When there is no position
input, the GPS icon appears (flashing), as shown in the figure at the bottom of this
page.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Rotate the CH knob to select [Position Input] then
press the [SELECT] soft key.

4. Enter the latitude/longitude of your vessel and UTC
time in 24-hour notation.
To set coordinate: North (N): 6/DW key South (S): 7/
SQRM key East (E): 3/SCAN key West (W): 9/FOG
key
You may backspace the cursor by pressing the [BACK]
soft key, if you made a mistake.

5. When you have completed the input of position and time, press and hold down the
[ENT] soft key for two seconds to save the setting.

6. Press the [QUIT] soft key several times to return to radio operation.

The indication "POS Data Manual" appears when position is input manually.

GPS icon (flashing)

POS Data
In Manual

(Indicates no position data
from GPS receiver.)

4-3

4. GENERAL SETUP

4.8 Key Beep

Set the level of the key beep that is emitted when a key is pressed.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Rotate the CH knob to select [Key Beep] then press
the [SELECT] soft key.

4. Rotate the CH knob to select the desired level then
press the [ENT] soft key to store the selected level. The beep level can be set from
[Level 1] to [Level 6], [High], or [Off].

5. Press the [QUIT] soft several times to return to radio operation.

4.9 Treble and Bass Audio Tone Control

The treble and bass of the speaker can be adjusted for best listening in noisy environ­ments. The effect is similar to the treble and bass controls on stereo equipment.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Rotate the CH knob to select [Tone Control] then press
the [SELECT] soft key.

4. Select [Bass] with the CH knob then press the [ENT]
soft key.

5. Rotate the CH knob to select desired audio response in the lower frequency range
then press the [ENT] soft key to store the selected setting. The setting range is ­6 to +6.

6. Select [Treble] with the CH knob then press the [ENT] soft key.

7. Rotate the CH knob to select desired audio response in the higher frequency
range then press the [ENT] soft key to store the selected setting. The setting range
is -6 to +6.

8. Press the [QUIT] soft key several times to return to radio operation.

4.10 Fog Alert Tone Frequency

4-4

Set the fog alert tone according to the size your vessel, as shown below.

70 to 200 Hz: Vessel that are 200 meters or more in length
130 to 350Hz: Vessel that are 75 meters but less than 200 meters in length
250 to 525 Hz: Vessel that are 20 meters but less than 75 meters in length
250 to 525 Hz: Vessel that are 12 meters but less than 20 meters in length

Note: The default radio fog frequency is set to 400Hz. In most cases this frequency
should not be changed unless the vessel is very large.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

3. Rotate the CH knob to select [Fog Frequency] then press the [SELECT] soft key

4. Rotate the CH knob to select the desired tone frequen­cy then press the [ENT] soft key to store the selected
setting.

5. Press the [QUIT] soft key several times to return to ra­dio operation.

4.11 How to Name the Radio or Handset

You can change the name of the radio or second station microphone. Example: "Ra­dio” to “Cabin", "RAM1” to “Flybridge".

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Rotate the CH knob to select [Station Name] then
press the [SELECT] soft key.

4. GENERAL SETUP

4. With the second station microphone connected, rotate
the CH knob to select the unit ([Radio], [RAM1] or [RAM2]) to be named then
press the [ENT] soft key.

5. Press applicable key to enter the first letter of the new station name.
Example: Press the 2/MEM key repeatedly to toggle among the seven available
characters associated with that key: 2 → A → B → C → a → b → c → 2...

6. Press the ENT key to store the first letter in the name and move to the next letter
to the right.

7. Repeat steps 5 and 6 to complete the name. The
name can have a maximum of 8 characters. If you do
not use all 8 characters, press the ENT key to move to
the next space. This method can also be used to enter
a blank space in the name. If you enter a wrong char­acter, press the [BACK] soft key until the wrong character is selected, then enter
the correct character.

8. Press and hold the [ENT] soft key to enter the name.

9. If you want to enter the name of the connected HS-4721 Handset, repeat steps 4
through 8.

10. Press the [QUIT] soft key several times to return to radio operation.

4-5

4. GENERAL SETUP

4.12 Soft Keys

This section shows you how to set up the soft keys. You can select the number of soft
keys to use, program the soft keys and select how long to show the soft key icon after
a soft key is pressed.

4.12.1 Transceiver unit

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

3. Rotate the CH knob to select [Soft Keys] then press the [SELECT] soft key.

4. Rotate the CH knob to select [Number of Soft Keys]
then press the [SELECT] soft key.

5. Rotate the CH knob to select the number of soft keys
(3 through 10) to use then press the [ENT] soft key.

6. Rotate the CH knob to select [Key Assignment] then
press the [SELECT] soft key (to assign the use of selected soft keys).

Select Key Assignment;
press [SELECT] soft key.

7. Rotate the CH knob to select the key ([Key 1], [Key 2],
[Key 3], etc.) then press the [SELECT] soft key.

8. Rotate the CH knob to select a new function then
press the [ENT] soft key. See the table below for func­tions.

9. Press the [QUIT] soft key.

10. Rotate the CH knob to select [Key Timer] then press the [SELECT] soft key. [Key
Timer] sets how long to display a soft key icon after a soft key is pressed.

Select Key Timer;

press [SELECT] soft key.

11. Rotate the CH knob to select the time then press the [ENT] soft key to store the
selected setting.

12. Press the [QUIT] soft key several times to return to radio operation.

4-6

Function Description

[DIMMER] Selects the menu for the display and key back light intensity.
[SCAN] Starts and stops scanning.
[DW] Starts and stops dual watch scan.
[IC] Activates Intercom between radio and HS-4721 Handset.
[PA/FOG] Activates the PA / foghorn function.
[PRESET] Programs or deletes the preset memory channel.
[SCRAMBLER] Activates the voice scrambler.

4.12.2 Handset HS-4721

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears. Select
[GENERAL SETUP] with the S or T key then press the [SELECT] soft key.

2. Press the T key to select [Soft Keys] then press the [ENT] soft key.

3. Press the T key to select [Number of Soft Keys] then press the [SELECT] soft
key.

4. Press the S or T key to select the number of soft keys (3 through 10) to use then
press the [ENT] soft key.

5. Press the S or T key to select [Key Assignment] (to assign the use of selected
soft keys) then press the [SELECT] soft key.

6. Press the S or T key to select the key ([KEY1], [KEY2], [KEY3], etc.) then press
the [SELECT] soft key. Press the S or T key to select a new function to be as­signed then press the [ENT] soft key. Available functions are listed on the previous
page. Repeat step 6 to program the other soft keys.

7. Press the S or T key to select [Key Timer] then press the [SELECT] soft key.
[Key Timer] sets how long a soft key icon is shown on the display after a soft key
is pressed.

4. GENERAL SETUP

8. Press the S or T key to select the time then press the [ENT] soft key to store the
selected setting.

9. Press the [QUIT] soft key several times to return to handset operation.

4.13 Calendar Setup

The FM-4721 has a built in clock to remember date, time, latitude and longitude. A
GPS receiver not only provides position data but also updates the calendar. Refer to
section 8.5 Accessory Cable.

GPS receiver connected: The FM-4721 automatically updates the calendar date and
time information after being connected for one hour.

GPS receiver not connected: The date and time must be manually entered into the
Calendar Menu in order for the clock to operate. The time you enter is your local time
in UTC format.

4-7

4. GENERAL SETUP

Example 1: If you are East of UTC time, add the offset to your time.

Offset +1
Time (convert local time to 24 hour) 4:00PM (12hour) or 16:00 (24hour)
Calculate 24hour local - Offset (East of UTC) 16:00 - 01:00 = 15:00

Example 2: If you are west of UTC time, subtract the offset from your time.

Offset -5
Time (convert local time to 24 hour) 4:00PM (12hour) or 16:00 (24hour)
Calculate 24hour local + Offset (West of UTC) 16:00 + 05:00 = 21:00

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Rotate the CH knob to select [Calendar] then press the
[SELECT] soft key. Repeat this step.

City Rome

City New York

4. Enter the current date (yyyy/mm/dd) with the numeric
keys. If you made a mistake, press the [BACK] soft key
until the wrong number is selected, then enter the cor­rect number.

5. Use the map on the previous page to find the UTC time
of your position.
Note: For daylight savings time subtract one hour to the offset in your time zone.

6. To enter the time, press the [ENT] soft key until the first
digit in the Time line is selected then enter the time
with the numeric keys.

7. Press and hold the [ENT] soft key to store the selected
setting.

8. Select [Update] with the CH knob then press the [SELECT] soft key.

9. Turn the CH knob to select the method of the time ad­justment, [Automatic] or [Manual] then press the [ENT]
soft key to store the selected setting.

10. Press the [QUIT] soft key several times to return to ra­dio operation.

Note: The calendar is backed up for approximately one week after the power is turned
off.

4-8

4.14 How to Set the Timeouts

A timeout determines the number of minutes the radio should keep a given screen dis­played before it restores the standby display, if no radio operation is detected. There
are three types of screens for which you can set a timeout: menu, DSC non-distress,
and DSC distress. Set the timeout for these screens as follows:

1. Long-press the CALL/MENU key to show the [Setup Menu].

2. Use the CH knob to select [DSC Setup] then press the [SELECT] soft key.

3. Use the CH knob to select [No Act Timer on Menu], [No Act Timer on DSC] or [No
Act Timer on DIST] as appropriate then press the [SELECT] soft key. For exam­ple, select [No Act Timer on Menu]. (The choices for each menu are the same.)

No Act Timer on Menu

No Act Timer on Menu

1 min
2 min
3 min
4 min
5 min

10 min

ENT

ENT

No Act Timer on Menu: Set the number of minutes to keep a menu screen dis­played before the standby screen is restored, if there is no radio operation.No Act
Timer on DSC: Set the number of minutes to wait before the standby screen is
restored, if there is no radio operation after a DSC non-distress message is re­ceived.No Act Timer on DIST: Set the number of minutes to wait before the
standby screen is restored, if there is no radio operation after a DSC distress mes­sage is received.

4. GENERAL SETUP

4. Use the CH knob to select the number of minutes desired (1, 2, 3, 4, 5, 10, 15, 20)
or [OFF] then press the [ENT] soft key. [OFF] keeps a screen displayed until radio
operation is detected.

5. Press the [QUIT] soft key several times to close the menu and return to radio op­eration.

4-9

4. GENERAL SETUP

This page is intentionally left blank.

4-10

5. CHANNEL FUNCTION SETUP

5.1 CH Group

Select the channel group among USA, Canada, and International.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [CH FUNCTION Setup]
then press the [SELECT] soft key.

3. Rotate the CH knob to select [CH Group] then press
the [SELECT] soft key.

4. Rotate the CH knob to select desired channel group
among [USA], [INTL] and [CAN] (Canada) then press the [ENT] soft key to store
the selected setting.

5. Press the [QUIT] soft key several times to return to radio operation.

5.2 Scan Memory

In order to scan channels, store the desired scan channels in the scan memory as
shown below.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Rotate the CH knob to select [Scan Memory CH] then
press the [SELECT] soft key.

4. Rotate the CH knob to select the channel to scan then
press the [ADD] soft key. "MEM" appears on the display to indicate that the chan­nel has been memorized to the scan channel.

5. Repeat step 4 for to select another channel.

6. To delete a channel from the list, select the channel then press the [DELETE] soft
key. "MEM" icon disappears from the display.

7. When you have completed your selection, press the [QUIT] soft key several times
to return to radio operation.

5-1

5. CHANNEL FUNCTION SETUP

5.3 Scan Type

Select the scan mode between [Memory Scan] and [Priority Scan].

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Select [Scan Type] with the CH knob then press the
[SELECT] soft key.

4. Rotate the CH knob to select [Priority Scan] or [Memory Scan] then press the
[ENT] soft key to store the selected setting.

5. Press the [QUIT] soft key several times to return to radio operation.

5.4 Scan Resume

Set the time the FM-4721 waits after a transmission ends until the radio resumes
channel scanning.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Select [Scan Resume] with the CH knob then press
the [SELECT] soft key.

4. Rotate the CH knob to select the desired resume time
then press the [ENT] soft key to store the selected setting. [OFF] resumes scan­ning after the other station stops transmitting (carrier drops).

5. Press the [QUIT] soft key several times to return to radio operation.

5.5 Priority CH

The default priority channel in channel scan is CH16. To select a different channel, do
the following:

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Select [Priority CH] with the CH knob then press the
[SELECT] soft key.

5-2

4. Rotate the CH knob to select the desired channel to be
a priority CH then press the [ENT] soft key.

5. Press the [QUIT] soft key several times to return to radio operation.

5.6 Weather Alert Setup

In the event of extreme weather disturbances, such as storms and hurricanes, the
NOAA (National Oceanic and Atmospheric Administration) sends a weather alert ac­companied by a 1050 Hz tone and subsequent weather report on one of the NOAA
weather channels. You can turn this alert on or off.

1. Press and hold down the CALL/MENU key until the
[Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Select [WX Alert] with the CH knob then press the [SE­LECT] soft key.

4. Rotate the CH knob to select [On] or [Off] then press the [ENT] soft key to store
the selected setting.

5. Press the [QUIT] soft key several times to return to radio operation.

5. CHANNEL FUNCTION SETUP

5-3

5. CHANNEL FUNCTION SETUP

5.7 Channel Naming

When the radio mode is in use, the display shows a name under the channel number
selected. This is name of the current channel. You can customize channel names as
follows:

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [CH Function Setup] then
press the [SELECT] soft key.

3. Select [CH Name] with the CH knob then press the
[SELECT] soft key.

4. Rotate the CH knob to select a channel then press the
[ENT] soft key.

5. Press applicable key to enter the first letter of the new
channel name.

Example: Press the 4/DIM key repeatedly to toggle
among the seven available characters associated with
the key: 4 → G → H → I → g → h → i → 4...

6. Press the [ENT] soft key to store the first letter in the
name and move to the next letter to the right.

7. Repeat steps 5 and 6 to complete the name. The name
can have a maximum of 16 characters. Use the [ENT]
soft key to shift the cursor. This method can also be
used to enter a blank space in the name. If you enter a
wrong character, press the [BACK] soft key until the
wrong character is selected, then enter the correct
character.

8. Press and hold the [ENT] soft key to save the name.

9. Press the [QUIT] soft key several times to return to ra­dio operation.

5-4

6. ATIS SETUP

The FM-4721 supports the ATIS (Automatic Transmitter Identification System) used
in Inland waterways in Europe. When enabled, the ATIS mode transmits a unique
ATIS code each time the microphone's PTT switch is released at the end of a trans­mission. Users should check with their local marine regulatory authority in their coun­try for assistance in obtaining an ATIS code. "ATIS" appears on the display when the
ATIS mode is active.

6.1 ATIS Code Programming

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [ATIS Setup] menu then press the [SELECT] soft
key.

3. Select [ATIS Code] with the CH knob then press the
[SELECT] soft key.

4. Press applicable keys to enter your ATIS (ten digits). (If
you made an error when you entered the ATIS, press
the [BACK] soft key until the wrong number is selected,
then press the correct numeric key.)

5. Press and hold the [ENT] soft key. The radio asks you
to input the ATIS number again. Do step 4 above to en­ter the number again. Press and hold the [ENT] soft
key.

6. Enter the number. Press the [OK] soft key to store the
ATIS number in the memory.

7. Press the [QUIT] soft key several times to return to ra­dio operation.

6-1

6. ATIS SETUP

6.2 ATIS Channel Group

The FM-4721 has the capability to turn on and off the ATIS feature for each channel
Group call but operator must select only INTL channel group.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Rotate the CH knob to select [ATIS Group] menu then press the [SELECT] soft
key.

3. Rotate the CH knob to select [Group] then press the
[SELECT] soft key.

4. Rotate the CH knob to select the channel Group call
you wish to change the setting then press the [ENT]
soft key.

5. Rotate the CH knob to select [On] or [Off].

6. Press the [ENT] soft key to store the selected setting.

7. Press the [QUIT] soft key several times to return to radio operation.

6-2

7. MAINTENANCE, TROUBLESHOOTING

WARNING

ELECTRICAL SHOCK HAZARD

Do not open the equipment.

This equipment uses high
voltage that can cause
electrical shock.
0nly qualified persons can
work inside the equipment.

7.1 General Maintenance

CAUTION

The heatsink can get hot enough to cause a
burn injury. Allow the unit to cool before do­ing any maintenance procedures.

NOTICE

D

o not apply paint, anti-corrosive
sealant or contact spray to plastic
parts or equipment coating.

Those items contain products that can
damage plastic parts and equipment
coating.

The inherent quality of the solid-state components used in this transceiver should pro­vide many years of continuous use. However, take the following precautions to pre­vent damage to the transceiver.

• Keep the microphone connected or the jack covered at all times to prevent corro­sion of electrical contacts.

• Remove dust from the cabinet with a dry clean cloth. Do not use commercial clean­ers to clean the equipment. Those cleaners can remove paint and markers.

• Check that all cables are tightly fastened. Check the cables for corrosion and rust.
Connect the cables that have loosened. Replace any damaged cables.

• Never key the microphone unless an antenna or suitable dummy load is connected
to the transceiver.

• The supply voltage range to the transceiver must be within 10.8 - 15.6 VDC.

• Use only FURUNO-approved accessories and replacement parts.

• Wipe the LCD carefully to prevent scratching, using tissue paper and an LCD clean­er. To remove dirt or salt deposits, use an LCD cleaner, wiping slowly with tissue
paper so as to dissolve the dirt or salt. Change paper frequently so the salt or dirt
does not scratch the LCD. Do not use solvents such as thinner, acetone or benzene
for cleaning.

• In the unlikely event of serious problems, please contact your dealer.

7-1

7. MAINTENANCE, TROUBLESHOOTING

7.2 Troubleshooting Chart

Symptom Probable cause Remedy

Transceiver cannot
be powered.

Transceiver blows
fuse when connected
to power supply.

Popping or whining
noise from the speak­er while engine runs.

Sound is not emitted
from the internal or
external speaker.

Sound is not emitted
from the PA speaker.

No DC voltage to the transceiv­er, or blown fuse

Reversed polarity of power
wires

Engine noise Reroute the DC power cable away from

Accessory cable Check the connections of the accessory

Accessory cable Check the connections of the accessory

• Check the 10.8 - 15.6 VDC battery con­nections and the fuse.

• The (power) button needs to be
pressed and held to turn the radio on.

Check the power cable for DC voltage, or
replace the fuse (6A 250 V).
Make sure the red wire is connected to
the positive (+) battery post, and the black
wire is connected to the negative (-) bat­tery post. If the fuse still blows, contact
your dealer.

the engine. Add a noise suppressor on
power cable. Change to resistive spark
plug wires and/or add an alternator whine
filter.

cable for short circuit on external speaker
cable (WHITE & SHIELD).

cable for short circuit on PA speaker ca­ble. (RED & SHIELD).

Receiving station re­ports low transmit
power, even with
HIGH power.

The message "HI
BATTERY" or "LO
BATTERY" appears
when the power is
turned on.

Your position is not
displayed.

Antenna Have the antenna checked or test the

transceiver with another antenna. If the
problem persists, contact your dealer.

The power supply voltage is too
high or too low.

Accessory cable. Check the accessory cable connection.

Setting of the GPS receiver Check the output signal format of the

Confirm that the connected power supply
voltage is within 10.8 - 15.6 VDC.

GPS receiver. This radio requires the
GLL, RMB, or RMC sentence as an out­put signal. If baud rate and parity can be
set on the GPS receiver, select them to
4800 and NONE, respectively.

7-2

7.3 How to Replace the Fuse

If the power cannot be turned on, the fuse may have blown. To take out the fuse from
the fuse holder on the power cable, hold both ends of the fuse holder and pull the fuse
holder apart without bending the fuse holder. When you replace the fuse, confirm that
the fuse is tightly fixed on the metal contact located inside the fuse holder. If the metal
contact holding the fuse is loose, the fuse holder may become hot.

WARNING

Use the proper fuse.

Use of a wrong fuse can result in damage
to the equipment and cause fire.

7.4 How to Clear the Memory

7. MAINTENANCE, TROUBLESHOOTING

To clear the scan memory and preset memory:

1. Turn the radio off.

2. Press and hold down the three soft keys then turn on the radio.

7.5 How to Reset the Microprocessor

To clear all memories and other settings to factory defaults (except the Channel
Group, MMSI number, Individual Directory and Group Directory), follow the procedure
shown below. The display shows "EE-PROM Resetting" while the resetting is being
done.

1. Turn the radio off.

2. Press and hold the 16/9, CALL/MENU, and CLR/WX keys then turn on the radio.

7-3

7. MAINTENANCE, TROUBLESHOOTING

7.6 Daily Test

The daily test is an FSK loop test that sends a dummy DSC message to check if the
message is sent and received correctly.

1. Long push the CALL/MENU key to show the [Setup] Menu.

2. Rotate the CH knob to select [Daily Test] then press the [Select] soft key.

FSK Loop Test

Start a Test?

3. Push the [ENT] soft key to start the test.

The message "Testing" appears momentarily then "Check OK" or "Check NG" (No
Good) appears. If NG appears, request service.

Daily Test

ENT

7-4

8. INSTALLATION

8.1 Transceiver Unit

The transceiver unit can be mounted on a desktop or overhead, or flush mounted in a
panel. Choose a mounting location considering the points mentioned below.

• Follow the compass safety distance shown in the safety Instructions to avoid any
interference to the compass from the speaker magnet in the transceiver.

• Select a location which provides easy access to the front panel controls.

• The location has space for installation of a microphone hanger.

• Choose a mounting location that is at least 1 m away from the radio's antenna.

• CAUTION: The heatsink can get hot enough to cause a burn injury. Select a

location where it cannot be easily touched.

Note: To insure the radio does not affect the compass and the radio's performance is

not affected by the antenna location, temporarily locate the radio in the desired loca­tion and:

a) Examine the compass to see if the radio interferes with the compass.

b) Connect the antenna and transmit. Check to ensure the radio is operating correctly

by requesting a radio check.

8.1.1 Desktop or overhead mount

The supplied mounting bracket permits desktop or overhead mounting.

Use a 5 mm bit to drill the holes to a surface that is more than 10 mm thick and can
support the unit’s weight (1.5 kg). Fasten the bracket with the supplied screws, spring
washers, flat washers, and nuts.

Desktop mounting Overhead mounting

8-1

8. INSTALLATION

8.1.2 Flush mount (option)

Requires the MMB-84 flush mount bracket.

1. Make a rectangular template for the flush mount measuring 65×161 mm.

2. Use the template to mark the location where the rectangular hole is to be cut. Con­firm that the space behind the dash or panel is deep enough to accommodate the
transceiver (at least 177 mm deep). There must be at least 150 mm between the
transceiver's heatsink and any wiring, cables or structures.

3. Cut out the rectangular hole and insert the transceiver.

4. Fasten the brackets to the sides of the transceiver with the lock-washer screw
combination.

5. Turn the adjusting screws to adjust the tension so that the transceiver is tight
against the mounting surface.

Bracket

8.2 Antenna

Marine antennas are made to radiate signals equally in all horizontal directions, but
not straight up. The objective of a marine antenna is to enhance the signal toward the
horizon. The degree to which this is accomplished is called the antenna's gain. It is
measured in decibels (dB) and is one of the major factors in choosing an antenna. In
terms of effective radiated power (ERP), antennas are rated on the basis of how much
gain they have over a theoretical antenna with zero gain. A 1 m, 3 dB gain antenna
represents twice as much gain over the imaginary antenna.

Adjusting Screw

Lock-washer screw combination

8-2

Typically a 1 m 3 dB gain stainless steel whip is used on a sailboat mast. The longer

2.5 m 6 dB fiberglass whip is primarily used on power boats that require the additional

gain.

8.3 Coaxial Cable

CAUTION

The VHF antenna is connected to the transceiver by means of a coaxial cable - a
shielded transmission line. Coaxial cable is specified by its diameter and construction.

For runs less than 6 m, RG-58/U, which is approx. 1/4 inch in diameter, is a good
choice. For runs over 6 m but less than 15 m, use the larger RG-8X or RG-213/U. For
cable runs over 15 m, use RG-8X. See the figure below for how to attach the connector
the cable.

8. INSTALLATION

2 mm

1/16''

3/4''

20 mm

30 mm

1 1/8''

Solder here.

To get your coaxial cable through a fitting and into your boat's interior, you may have
to cut off the end plug and reattach it later. You can do this if you follow the directions
that come with the connector. Be sure to make good soldered connections.

8.4 Electrical Connections

Connect the power cable, handset and antenna to the radio. The antenna and power
supply connections are as follows:

1. Mount the antenna at least 1 m away from the radio. At the rear of the radio, con­nect the antenna cable. The antenna cable must have a PL259 connector at­tached. Use coaxial cable RG-8/U if the antenna is 7.6 m or more from the radio.
Use RG58 for distances less than 7.6 m.

Adapter

1/8''

3 mm

10 mm 15 mm

3/4''

20 mm

5/8''3/8''

2. Connect the red power wire to the positive terminal of the power source. Connect
the black power wire to a negative ground.

3. Connect the handset to the remote connector on the rear panel.

4. If an external speaker is used, refer to section 8.5 for the connection.

5. It is advisable to have a certified marine technician check the power output and
the standing wave ratio of the antenna after installation.

CAUTION

Reverse polarity battery connections
will damage the radio.

8-3

8. INSTALLATION

A

Accessory

Cable

A

Loudhailer Horn

ntenna

Red

Power Source

Accessory
Cable

Waterproof
Deck Outlet

Black

GPS Receiver

Fuse

External Speaker

HS-4721 Handset

External Speaker

How to attach ferrite core

To suppress RF interference that can cause abnormal operation of the transceiver, at­tach the supplied three ferrite cores to the Accessory Cable/Power Cable and Exten­sion Cable, then snap its two halves together, as shown in the illustration below.

Attach each ferrite core as close as possible to the transceiver body, as shown. Final­ly, wind some plastic tape around each ferrite core, to prevent vibration from causing
the two halves to split apart.

Snap together

ccessory Cable/

Power Cable

Extension cable

Ferrite core

Snap together

Ferrite core

As close as possible

Snap together

8-4

8.5 Accessory Cable

8. INSTALLATION

Red

PA Speaker

Shield

Plotter

MEM

Radio Wires

Gray: NMEA Output (+)
Brown: NMEA DSC Output (-)
Blue: NMEA Input (+)
Green: NMEA GPS Input (-)

White

Connection

NMEA IN (+)

NMEA IN (-)
NMEA OUT (+)
NMEA OUT (-)

External Speaker

Connect to
GPS Receiver/
Chart Plotter

Shield

Wire Color/Description Connection Examples

WHITE - External Speaker (+) Connect to external 4-ohm audio speaker

SHIELD - External Speaker (-) Connect to external 4-ohm audio speaker

RED - PA Speaker (+) Connect to external 4-ohm PA speaker

SHIELD - PA Speaker (-) Connect to external 4-ohm PA speaker

GREEN - NMEA GPS Input (-) Connect to NMEA (-) output of GPS receiver

BLUE - NMEA GPS Input (+) Connect to NMEA (+) output of GPS receiver

GRAY - NMEA DSC Output (+) Connect to NMEA (+) input of GPS receiver

BROWN - NMEA DSC Output (-) Connect to NMEA (-) input of GPS receiver

When making connections between the radio, chart plotter, GPS receiver, ensure that
the connections are tight and protected from shorting and the units are grounded.
Whether flush mounting the radio or not, it is recommended that a waterproof 8-posi­tion screw terminal connector block be fixed to the bulkhead adjacent to the rear of the
radio and the connections to and from the radio are made via this connector block.

Note: In some areas powerful AM broadcast stations may be heard when in the listen­back mode. If this occurs, change the speaker wire to 2-conductor shielded audio ca­ble. See the illustration below for connections.

MEM

Red

Bare

Connect the bare wire from the
FM-4721 to one wire and to the
shielded.

Make Red and bare connections as short as possible.

Shield of cable is not attached
on PA Speaker end.

2-conductor shielded

PA Speaker

8-5

8. INSTALLATION

GPS connections (4800 baud)

NMEA INPUT (GPS Information)

• The GPS receiver must have the NMEA Output turned on and set to 4800 Baud in
the Setup menu. If there is a selection for PARITY, select NONE.

BLUE - NMEA Input (+) GPS NMEA output (+)

GREEN - NMEA Input (-) GPS NMEA output (-) or common ground

• For further information on interfacing and setting up your GPS receiver, contact the
manufacturer of the GPS receiver.

• The FM-4721 can read NMEA-0183 version 2.0 or higher.

• The NMEA 0183 input sentences are GLL, GGA, RMC and GNS (RMC sentence is
recommended).

NMEA Output (DSC)

Wire Color/Description Connection

The NMEA 0183 output sentences are DSC and DSE.

Wire Color/Description Connection

GRAY - NMEA Output (+) Chart plotter NMEA input (+)

BROWN - NMEA Output (-) GPS NMEA input (-) or common ground

How to check GPS receiver connections

After you have connected the FM-4721 to the GPS receiver, your position in latitude
and longitude should appear on the display. If your position does not appear, the GPS
icon flashes continuously. Check the connection between the radio and the GPS re­ceiver.

Note: The indication "POS Data Manual" appears when position is input manually.

GPS icon (flashing)

POS Data
In Manual

(Indicates no position data
from GPS receiver.)

8.6 Handset HS-4721

The Handset remotely controls the Radio, DSC, and PA/Fog functions. In addition, the
FM-4721 can operate as a full function intercom system between the HS-4721 and the
FM-4721.

1. Connect the Extension Cable to the Handset connector (eight pin) on the rear

panel, then tighten the Nut (see illustration on the next page).

2. Referring to illustration on the next page, make a 30 mm hole in the wall, then in-

sert the Extension Cable into this hole. Connect the Gasket and Mounting Bracket
to the Extension Cable Connector using the Nut.

8-6

8. INSTALLATION

3. Drill the four screw holes (approx. 2 mm in diameter) on the wall, then fasten the
Mounting Bracket to the wall using four self-tapping screws.

4. Put the Rubber Cap onto the Nut. The installation is now complete.

The extension cable can be cut and spliced, however care needs to be taken when
reconnecting the wires to ensure watertight integrity. Before cutting the cable make
sure it is not plugged into the radio. After you have cut the cable, note the following
wires:
Yellow, Green, Brown, Purple, Blue, Green, Red*, Shield*

*: The red wire and shield wire are wrapped in foil. Remove the foil, and separate the
red wire from the shield wire.

External Speaker Connection

Extension Cable

Mounting
Bracket

How to mount the handset cradle

Fasten the cradle to the mounting location with two
self-tapping screws. Set the handset in the cradle.

Gasket

Rubber
Cap

Nut

8-7

8. INSTALLATION

8.6.1 How to use an external speaker

The HS-4721 can drive the internal speaker or an external speaker. In noisy locations
an external speaker may be connected to the white speaker wires on the HS-4721
routing cable. When connecting an external speaker, follow the procedure below to
turn off the internal speaker and enable the external speaker.

1. On the HS-4721 Handset, press and hold the CALL/
MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the S or T key then press
the [SELECT] soft key.

3. Press the T key to select [EXT Speaker] then press
the [SELECT] soft key.

4. Press the S or T key to select [On] (External speaker
on) then press the [ENT] soft key to save the selection.

5. Press the [QUIT] soft key several times to quit.

8.7 How to Set up the Equipment from the Menu

8.7.1 How to set time offset to show local time

The FM-4721 is set at the factory to show GPS satellite time or UTC time when an
optional GPS receiver is connected. If you prefer to use local time, enter the time dif­ference between your local time and UTC. The time offset must be set in order for the
radio to display the current time in your area.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press
the [SELECT] soft key.

3. Select [Time Offset] with the CH knob then press the
[SELECT] soft key.

4. Rotate the CH knob to select the time offset of your lo­cation. See the illustration below to find your offset time. [00:00] applies no offset;
the time is the same as UTC (Universal Time Coordinated or GPS Satellite Time).

8-8

5. Press the [ENT] soft key to store the time offset.

6. Press the [QUIT] soft key several times to return to radio operation.

8.7.2 How to show local time or UTC time

You can show UTC time or local time.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

3. Rotate the CH knob to select [Time Area] then press
the [SELECT] soft key.

4. Rotate the CH knob to select [UTC] or [Local] then
press the [ENT] soft key to store the selected setting.

5. Press the [QUIT] soft key several times to return to ra­dio operation.

8.7.3 How to set the time notation

Time can be shown in 12-hour or 24-hour format.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

8. INSTALLATION

3. Rotate the CH knob to select [Time Display] then press
the [SELECT] soft key.

4. Rotate the CH knob to select [12 Hour] or [24 Hour]
then press the [ENT] soft key to store the selected set­ting.

5. Press the [QUIT] soft key several times to return to radio operation.

8.7.4 How to select GPS COG format

The GPS-measured Course Over Ground can be shown in true or magnetic bearing.

1. Press and hold down the CALL/MENU key until the [Setup Menu] appears.

2. Select [General Setup] with the CH knob then press the [SELECT] soft key.

3. Rotate the CH knob to select [Magnetic] then press the
[SELECT] soft key.

4. Rotate the CH knob to select [Magnetic] or [True] then
press the [ENT] soft key to store the selected setting.

5. Press the [QUIT] soft key several times to return to ra­dio operation.

8-9

8. INSTALLATION

8.8 Optional Equipment

8.8.1 Bluetooth Adapter Unit BU-1

The BU-1 installs inside the transceiver and enables bluetooth compatible devices
such as a bluetooth headset.

Before starting the installation, turn the transceiver off and disconnect all cables from
the transceiver. Touch a metal place to discharge any static electricity from your body.

1. Unfasten six screws to remove the cover.

2. Unplug the connector connected between the cover and the circuit board in the
transceiver. Remove the paper tape from the location shown in the figure below.

Connector

(Connects to Bluetooth

Adapter circuit board.)

Remove paper tape.

Unplug connector.

3. Mate the connector on the Bluetooth Adapter circuit board with the connector
shown in the illustration above.

4. Check that the gasket at the rear of the transceiver is properly seated.

8-10

Gasket
(Tab on gasket at
top right corner)

5. Set the cover to the transceiver and connect the connector to the circuit board in
the transceiver.

6. Close the cover.

8.8.2 Voice Scrambler FVP-42

The Voice Scrambler installs inside the transceiver and provides private communica­tions with an FM-4721 equipped with the FVP-42.

Before starting the installation, turn the transceiver off and disconnect all cables from
the transceiver. Touch a metal place to discharge any static electricity from your body.

1. Do steps 1 and 2 in section 8.8.1 to remove the cover and unplug a connector.

2. Turn the transceiver upside down.

3. Unfasten four screws to remove the shield cover.

8. INSTALLATION

4. Referring to the figure below, remove the dummy connector and unfasten two
screws. The dummy connector can be discarded. Save the screws for later use.

Remove dummy connector.

Unfasten
screw.

8-11

8. INSTALLATION

5. Fasten the Voice Scrambler circuit board to the transceiver with the screws unfas­tened at step 4. Plug in the connector from the Voice Scrambler circuit board
where the dummy connector was connected.

Fasten circuit board
with screw.

Voice Scrambler
circuit board

Plug in connector from
circuit board here.

6. Close the shield cover.

7. Turn the transceiver right side up.

8. Check that the gasket at the rear of the transceiver is properly seated. (See the
figure at the bottom of page 8-10.)

9. Set the cover to the transceiver and connect the connector to the circuit board in
the transceiver.

10. Close the cover.

8-12

APPENDIX 1 CHANNEL ASSIGN­MENTS, MENU TREE

Channel Assignments

This chapter provides the VHF Marine Channel assignments for U.S.A. and International use. Be­low are listed some data about the charts.

1. Channels indicated as VTS are part of the U.S. Coast Guard's Vessel Traffic System.

2. Alpha channel numbers, that is, channel numbers followed by the letter A (such as Channel
07A) are simplex channels on the U.S.A. or Canadian channel assignments whose counter­parts in the International assignments are duplex channels. International channels do not use
alpha numbers. If you call the Coast Guard on CH16, they may ask you to "go to channel 22
Alpha." This is a channel assigned to the U.S.A, and Canadian Coast Guards for handling dis­tress and other calls. If your radio is set for International operation, go to Channel 22 instead
of 22A, to communicate with the Coast Guard. To use Channel 22A, your radio must be set
for USA or Canada operation, usually by a U/I/C (USA/International/Canada) control or com­bination of controls. Channel 22 (without an "A") is an International duplex channel for port
operations. Some radios indicate an "A" adjacent to the alpha channels on the display; on oth­ers "alpha" is not indicated but the proper channel is selected based on the U/I/C setting.

3. Bridge-to-Bridge channels (for example, Channel 13) are for use by bridge operators on inter­coastal waterways and rivers. It is also used by marine vessels in the vicinity of these bridges
for navigation and for communicating with the bridge operators. Note that a limit of 1 Watt is
specified for these channels.

4. The S/D column on the chart indicates either S (simplex) or D (duplex). Simplex means trans­mitting and receiving on the same frequency. Only one party at a time can talk, unlike a tele­phone. Be sure to say "over" and release your microphone push-to-talk switch at the end of
each transmission. Duplex operation involves the use of one frequency for transmitting and a
the other frequency for receiving. On channels specified as duplex on the charts, correct
mode of operation is established automatically by your radio when you select a channel; you
cannot change the mode. Release the push-to-talk switch after each transmission in order to
listen to the radio.

5. Channels normally used by recreational boaters are those that include the term "non-commer­cial" in the Channel Use column of the chart. Some of these are shared with other users and
some are used only in certain geographic regions.

6. Marine vessels equipped with VHF radios are required to monitor CH16.

VHF marine channel chart

CH U C I S/D TX RX Channel use

01 X X D 156.050 160.650 Public Correspondence (Marine Operator)

01A X S 156.050 Port Operation and Commercial.

VTS in selected areas
02 X X D 156.100 160.700 Public Correspondence (Marine Operator)
03 X X D 156.150 160.750 Public Correspondence (Marine Operator)

03A* X S 156.150 U.S. Government Only, Coast Guard

04 X D 156.200 160.800 Public Correspondence (Marine Operator),

Port operation, ship movement

AP-1

APPENDIX 1 CHANNEL ASSIGNMENTS, MENU TREE

CH U C I S/D TX RX Channel use

04A X S 156.200 Pacific coast: Coast Guard, East Coast:

Commercial fishing

05 X D 156.250 160.850 Public Correspondence (Marine Operator),

Port operation, ship movement

05A X X S 156.250 Port operation. VTS in Seattle

06 X X X S 156.300 Inter-ship Safety
07 X D 156.350 160.950 Public Correspondence (Marine Operator),

Port operation, ship movement

07A X X S 156.350 Commercial

08 X X X S 156.400 Commercial (Inter-ship only)
09 X X X S 156.450 Boater Calling channel, Commercial & Non-

commercial (Recreational)
10 X X X S 156.500 Commercial
11 X X X S 156.550 Commercial. VTS in selected areas.
12 X X X S 156.600 Port operation. VTS in selected areas.
13 X X X S 156.650 Inter-ship Navigation Safety (Bridge-to-

bridge)
14 X X X S 156.700 Port operation. VTS in selected areas.
15 X S - 156.750 Environmental (Receive only)
15 X X S 156.750 Commercial, non-commercial, ship move-

ment (1 W)
16 X X X S 156.800 International Distress, Safety and Calling
17 X X X S 156.850 State Controlled (1 W)
18 X D 156.900 161.500 Port operation, ship movement

18A X X S 156.900 Commercial

19 X D 156.950 161.550 Port operation, ship movement

19A X S 156.950 US: Commercial
19A X S 156.950 Coast Guard

20 X X X D 157.000 161.600 Canadian Coast Guard Only,

International: port operations and shipment

20A X S 157.000 Port operation

21 X D 157.050 161.650 Port operation, ship movement

21A* X X S 157.050 U.S. Government Only, Canadian Coast

Guard
22 X D 157.100 161.700 Port operation, ship movement

22A X X S 157.100 US and Canadian Coast Guard Liaison and

Maritime Safety Information Broadcasts an-

nounced on channel 16
23 X X D 157.150 161.750 Public Correspondence (Marine Operator)

23A* X S 157.150 U.S. Government Only

24 X X X D 157.200 161.800 Public Correspondence (Marine Operator)
25 X X X D 157.250 161.850 Public Correspondence (Marine Operator)
26 X X X D 157.300 161.900 Public Correspondence (Marine Operator)
27 X X X D 157.350 161.950 Public Correspondence (Marine Operator)
28 X X X D 157.400 162.000 Public Correspondence (Marine Operator)
60 X X D 156.025 160.625 Public Correspondence (Marine Operator)
61 X D 156.075 160.675 Public Correspondence (Marine Operator),

Port operation, ship movement

61A* X X S 156.075 Public Coast: Coast Guard;

East Coast: commercial fishing only

AP-2

APPENDIX 1 CHANNEL ASSIGNMENTS, MENU TREE

CH U C I S/D TX RX Channel use

62 X D 156.125 160.725 Public Correspondence (Marine Operator),

Port operation, ship movement

62A X S 156.125 Public Coast: Coast Guard;

East Coast: commercial fishing only

63 X D 156.175 160.775 Public Correspondence (Marine Operator),

Port operation, ship movement

63A X X S 156.175 Port Operation and Commercial.

VTS in selected areas.

64 X X D 156.225 160.825 Public Correspondence (Marine Operator),

Port operation, ship movement

64A* X X S 156.225 Public Correspondence (Marine Operator),

Port operation, ship movement

65 X D 156.275 160.875 Public Correspondence (Marine Operator),

Port operation, ship movement

65A X X S 156.275 Port Operations

66 X D 156.325 160.925 Public Correspondence (Marine Operator),

Port operation, ship movement

66A X X S 156.325 Port Operations

67 X X X S 156.375 US: Commercial. Used for Bridge-to-bridge

communications in lower Mississippi River.
Intership only,

Canada: Commercial fishing, S&R
68 X X X S 156.425 Non-commercial (Recreational)
69 X X X S 156.475 US: Non-commercial (Recreational),

Canada: Commercial fishing only,

International: Inter-ship, Port operations and

Ship movement
70 X X X S 156.525 Digital selective calling (voice communica-

tions not allowed)
71 X X X S 156.575 US, Canada: Non-commercial (Recreation-

al),

International: Port operations and Ship move-

ment
72 X X X S 156.625 Non-commercial (Inter-ship only)
73 X X X S 156.675 US: Port Operations,

Canada: Commercial fishing only,

International: Inter-ship, Port operations and

Ship movement
74 X X X S 156.725 US: Port Operations,

Canada: Commercial fishing only,

International: Inter-ship, Port operations and

Ship movement
75 X X X S 156.775 Port Operations (Inter-ship only) (1W)
76 X X X S 156.825 Port Operations (Inter-ship only) (1W)
77 X X S 156.875 Port Operations (Inter-ship only) (1W)
77 X S 156.875 Port Operations (Inter-ship only)
78 X D 156.925 161.525 Public Correspondence (Marine Operator),

Port operation, ship-movement

78A X X S 156.925 Non-commercial (Recreational)

79 X D 156.975 161.575 Port operation and Ship movement

79A X X S 156.975 Commercial

80 X D 157.025 161.625 Port operation, ship movement

AP-3

APPENDIX 1 CHANNEL ASSIGNMENTS, MENU TREE

CH U C I S/D TX RX Channel use

80A X X S 157.025 Commercial

81 X D 157.075 161.675 Port operation, ship movement

81A* X S 157.075 U.S. Government Only -Environmental pro-

tection operations.

81A X S 157.075 Canadian Coast Guard Only

82 X D 157.125 161.725 Public Correspondence (Marine Operator),

Port operation, ship movement

82A* X X S 157.125 U.S. Government Only,

Canadian Coast Guard Only
83 X D 157.175 161.775 Canadian Coast Guard Only
83 X D 157.175 161.775 Public Correspondence (Marine Operator)

83A* X X S 157.175 U.S. Government Only,

Canadian Coast Guard Only
84 X X X D 157.225 161.825 Public Correspondence (Marine Operator)
85 X X X D 157.275 161.875 Public Correspondence (Marine Operator)
86 X X X D 157.325 161.925 Public Correspondence (Marine Operator)
87 X X S 157.375 Port operation, ship movement

87A X S 157.375 Public Correspondence (Marine Operator)

88 X X S 157.425 Port operation, ship movement

88A X S 157.425 Commercial, Inter-ship Only
WX01 X X X D - 162.550 Weather (receive only)
WX02 X X X D - 162.400 Weather (receive only)
WX03 X X X D - 162.475 Weather (receive only)
WX04 X X X D - 162.425 Weather (receive only)
WX05 X X X D - 162.450 Weather (receive only)
WX06 X X X D - 162.500 Weather (receive only)
WX07 X X X D - 162.525 Weather (receive only)
WX08 X X X D - 161.650 Weather (receive only)
WX09 X X X D - 161.775 Weather (receive only)
WX10 X X X D - 163.275 Weather (receive only)

*: Simplex channels, 3A, 21A, 23A, 61A, 64A, 81A, 82A and 83A cannot be lawfully used by the
general public in U.S.A. waters.

AP-4

APPENDIX 1 CHANNEL ASSIGNMENTS, MENU TREE

Menu Tree (default settings shown in bold italic)

DSC menu

CALL/
MENU
key

Setup menu

CALL/
MENU
key

(Long push)

DSC
Menu

Setup
Menu

Individual (Select, New ID)
Group (Select, Manual)
All Ships (Safety, Urgency)
POS Request (Select, Manual)
POS Report (Select, Manual)
Distress Alert MSG (Nature, POS/TM)
Auto POS Polling (Activation, Select Address)
DSC Log

DSC Test (Select, Manual)

Daily Test
General
Setup

(Continued on
Next page)

Transmitted Log
Distress Log
Other Call Log
Log Delete

Contrast (0 - 31, 10)
Time Offset (+12:00 to -12:00, 00:00)
Time Area (UTC, Local)
Time Display (12 hour, 24 hour)
Unit of Measure

Magnetic (True, Magnetic)
Position Input (Enter position, time)
Key Beep (High, Level 1 - Level 6, Off)
Tone Control

Fog Frequency (200 - 850 Hz (50 Hz steps), 400 Hz)
Station Name
(Name Station.)
Soft Keys

Calendar

Bluetooth

Transmitted Log
Distress Log
Other Call Log

Control Range (Bass, Treble)
Tone Level (-6 to +6, 0)

Select Unit
Unit Name

Number of Soft Keys (3 - 10)
Key Assignment

Key Timer (1 - 10sec; 5sec)

Calendar (Enter date, time.)
Update (Automatic, Manual)

VOX Function
Save Function
Pin Code
Pairing

Speed (KTS: Knots, MPH: Mile/Hour,
KMH: Kilo-Meter/Hour)
Distance (NM: Nautical Mile,
SM: Statute Mile, KM: Kilo-Meter)

Key 1 (None, DIMMER,
SCAN, DW, IC, PA/FOG,
PRESET, SCRAMBLER)
Key 2 (Same choices as
Key 1, no default setting.)
Key 3 (Same choices as
Key 1, no default setting.)

AP-5

APPENDIX 1 CHANNEL ASSIGNMENTS, MENU TREE

(Continued from previous page)

CH
Function
Setup

DSC
Setup

CH Group (Group 1: USA, Group 2: INTL, Group 3: CAN)
Scan Memory CH (Add, delete channels in scan memory.)
Scan Type (Priority Scan, Memory Scan)
Scan Resume (1 - 5sec, Off, 2sec)
Priority CH (Specify priority channel, 16 is default.)
WX Alert (On, Off)
CH Name

Scrambler (Select CH, CH Name)

Individual Directory (Add, Edit, Delete)
Individual Reply (Automatic, Manual)
Individual Ack (Able to Comply, Unable)
Individual Ring (2min, 5sec, 10sec, 15sec)
Group Directory (Add, Edit, Delete)
Position Reply (Automatic, Manual)
Auto POS Interval (1, 2, 3, 4, 5, 10, 20, 30, 40min)
DSC Beep

Auto CH Switch Time (20, 30, 40, 50sec; 1.0, 1.5, 2.0, 3.0, 5.0,

7.0, 10.0min)
No Act Timer on Menu (OFF, 1, 2, 3, 4, 5, 10, 15, 20 min)
No Act Timer on DSC (OFF, 1, 2, 3, 4, 5, 10, 15, 20 min)
No Act Timer on DIST (OFF, 1, 2, 3, 4, 5, 10, 15, 20 min)

Select Channel
CH Name

Select Call (Individual, Group, All Ships, Pos Request,
Pos Report, Geographical)
Beep (On, Off*) *POS Request

MMSI Setup (Input MMSI.)
ATIS
Group

ATIS Code
Group (Default is OFF.)

AP-6

FURUNO

FM-4721

SPECIFICATIONS OF MARINE VHF RADIOTELEPHONE

FM-4721

1 GENERAL

1.1 Channels USA, International and Canadian

1.2 Input voltage 12.0 VDC

1.3 Operating voltage range 10.8 to 15.6 VDC

1.4 Current drain Standby: 0.5 A, Receive: 1.5 A, Transmit: 6.0 A (Hi), 2.5 A (Lo)

2 TRANSMITTER

2.1 Frequency range 156.025 to 157.425 MHz

2.2 RF output power 25 W (Hi); 1 W (Lo)

2.3 Conducted spurious emissions

Less than 0.25 µW

2.4 Audio response Within +1/–3 of a 6 dB/octave pre-emphasis characteristic at

300 to 3000 Hz

2.5 Audio distortion 5%

2.6 Modulation 16K0G3E, for DSC 16K0G2B

2.7 Frequency stability ±0.0005% (–15 °C to +55 °C)

2.8 FM hum and noise 40 dB

3 RECEIVER

3.1 Frequency range 156.050 to 163.275 MHz

3.2 Sensitivity 20dB quieting: 0.30 µV

12 dB SINAD: 0.25 µV

Squelch sensitivity: 0.13 µV

3.3 Modulation acceptance bandwidth

±7.5 kHz

3.4 Selectivity Spurious and image rejection: -70 dB

Intermodulation and rejection: -68 dB

3.5 Audio output 2W, 4 ohm

4 ENVIRONMENTAL CONDITIONS

4.1 Ambient temperature -15°C to +55°C

4.2 Relative humidity 93% or less at 40°C

4.3 Degree of protection

Transceiver unit IPX7 (front panel), IPX4 (rear panel)

Handset IPX7

4.4 Vibration IEC 60945 Ed.4

SP - 1 E5684S01E

110415

FURUNO

This page is intentionally left blank.

FM-4721

SP - 2 E5684S01E

110415

INDEX

Numerics

0 key.......................................................... 2-2

16/9 key..................................................... 2-1

2/MEM key ................................................ 2-2

3/SCAN key............................................... 2-2

4/DIM key ........................................... 2-2

5/IC key ............................................2-2

6/DW key............................................2-2

7/SQRM key.....................................2-2

8/PA key........................................... 2-2

9/FOG key........................................ 2-2

, 2-6

, 2-13

, 2-8
, 2-16
, 2-11
, 2-12

A

All ships call

receiving.................................................. 3-7

transmitting.............................................. 3-6

ATIS

ATIS code ............................................... 6-1

channel group ......................................... 6-2

Audio tone ................................................. 4-4

B

Bluetooth

battery saver ......................................... 2-16

operation ............................................... 2-15

pairing ................................................... 2-14

VOX operation....................................... 2-15

C

Calendar.................................................... 4-7

CALL/MENU key ....................................... 2-1

Calls

emergency .............................................. 1-1

other vessel............................................. 1-1

CH group................................................... 5-1

CH key ...................................................... 2-2

CH13 ......................................................... 1-2

CH67 ......................................................... 1-2

Channel mode (Int., Canada, USA) .......... 2-6

Channel naming ........................................ 5-4

Channel preset

activation ............................................... 2-11

delete channel....................................... 2-11

procedure .............................................. 2-10

Channel switch time ................................ 3-24

CLR/WX key.......................................2-2

COG format............................................... 4-3

Contrast..................................................... 4-1

, 2-7

D

Daily test ................................................... 7-4

Dimmer...................................................... 2-6

Distress alert

canceling ................................................. 3-5

pausing.................................................... 3-5

receiving.................................................. 3-5

transmitting, nature not specified ............ 3-2

transmitting, nature specified .................. 3-3

transmitting, with manual position ........... 3-4

DISTRESS key........................... 2-2

DSC distress call log ............................... 3-13

DSC log

deleting calls ......................................... 3-14

DSC distress call log ............................. 3-13

other call log.......................................... 3-13

transmitted DSC call log........................ 3-13

DSC polling

enable/disable ....................................... 3-24

interval between position requests ........ 3-23

stations to poll ....................................... 3-23

DSC test call

making with manually entered MMSI .... 3-26

making with MMSI in Individual

Directory ............................................. 3-25

Dual watch ................................................ 2-8

, 3-2, 3-4

E

Emergency call.......................................... 1-1

ENT key .................................................... 2-2

External speaker ....................................... 8-8

F

Fog alert frequency ................................... 4-4

FOG HORN............................................. 2-12

FUNC key.................................................. 2-2

Fuse replacement ..................................... 7-3

G

Group call

Group Directory..................................... 3-14

receiving................................................ 3-17

transmitting to manually entered

Directory ............................................. 3-16

H

H/L key ...................................................... 2-1

I

Individual call

call acknowledge method ........................ 3-9

Individual Call Directory........................... 3-7

receiving, automatic .............................. 3-11

receiving, manual .................................. 3-12

reply method ........................................... 3-8

ringer ....................................................... 3-9

transmitting to manually entered MMSI. 3-10

transmitting to MMSI in Individua

Directory ............................................. 3-10

Individual Directory.................................... 3-7

Intercom

calling .................................................... 2-14

communication ...................................... 2-13

IN-1

INDEX

K

Key beep....................................................4-4

L

Local time...................................................4-2

M

Maintenance ..............................................7-1

Memory clear .............................................7-3

Memory scanning.......................................2-9

Microprocessor reset .................................7-3

MMSI

description................................................3-1

entry of .....................................................3-1

N

Naming station, handset ............................4-5

NOAA weather channels

selection of...............................................2-7

weather alert ............................................2-7

weather alert test......................................2-7

O

Other call log............................................3-13

P

PA HAIL ...................................................2-11

Position input (manual) ..............................4-3

Position report

receiving.................................................3-22

ringer......................................................3-20

transmitting to manually entered MMSI..3-21
transmitting to MMSI in Individual

Directory..............................................3-21

Position request

receiving.................................................3-20

reply setup..............................................3-18

ringer......................................................3-18

transmitting to manually entered MMSI..3-19
transmitting to MMSI in Individual

Directory..............................................3-19

Priority CH..................................................5-2

Priority scanning ......................................2-10

PWR key ....................................................2-2

T

Telephone call............................................1-2

Time notation .............................................4-2

Time offset .................................................4-1

Timeout ......................................................4-9

Transmission..............................................2-5

Transmit timeout timer ...............................2-6

Transmitted DSC call log .........................3-13

Troubleshooting .........................................7-2

U

Units of measurement................................4-2

UTC time....................................................4-2

V

Voice scrambler .......................................2-16

VOL control ................................................2-1

VOX operation .........................................2-15

W

Weather alert .............................................5-3

R

Reception...................................................2-5

S

Scan memory.............................................2-9

Scanning

memory scanning.....................................2-9

priority scanning.....................................2-10

programming scan memory .....................2-9

resuming ..................................................5-2

scan memory programming .....................5-1

scan type.......................................... 2-8

Soft keys

function.....................................................2-1

programming, handset .............................4-7

programming, transceiver unit..................4-6

SQL control ................................................2-1

, 5-2

IN-2

9-52, Ashihara-cho,
Nishinomiya, 662-8580, JAPAN

Telephone: [phone]

Fax: [phone]

All rig hts reserved.

Printed in Japan

Pub. No. OME-56840-A1
FM-4721

(Elemental Chlorine Free)

The paper used in this manual
is

elemental chlorine free.

FURUNO Authorized Distributor Dealer

A1 :MAY 2011