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INSTRUCTION MANUAL
iM304
VHF MARINE TRANSCEIVER
i
FOREWORD
Thank you for purchasing this Icom radio. The IC-M304
VHF
MARINE TRANSCEIVER
is designed and built with Icom’s state
of the art technology and craftsmanship. With proper care,
this radio should provide you with years of trouble-free oper-
ation.
We hope you agree with Icom’s philosophy of “technology
first.” Many hours of research and development went into the
design of your IC-M304.
D
FEATURES
Large 2-digit Channel with scrolling comment
New Force5Audio
speaker
Built-in DSC meets RTCM SC101 requirement
Submersible construction
Favorite channel function
AquaQuake water draining function
IMPORTANT
READ ALL INSTRUCTIONS carefully and completely
before using the transceiver.
SAVE THIS INSTRUCTION MANUAL — This in-
struction manual contains important operating instructions for
the IC-M304.
EXPLICIT DEFINITIONS
WORD DEFINITION
R WARNING!
CAUTION
NOTE
Personal injury, fire hazard or electric shock
may occur.
Equipment damage may occur.
Recommended for optimum use. No risk of
personal injury, fire or electric shock.
CLEAN THE TRANSCEIVER AND MICROPHONE THOR-
OUGHLY WITH FRESH WATER after exposure to water
including salt water, otherwise, the keys and switches may
become inoperable due to salt crystallization.
Icom, Icom Inc. and the logo are registered trademarks of Icom Incor-
porated (Japan) in the United States, the United Kingdom, Germany, France,
Spain, Russia and/or other countries.
FORCE5AUDIO logo is a registered trademark of Icom Incorporated (Japan) in
the United States.
ii
IN CASE OF EMERGENCY
If your vessel requires assistance, contact other vessels and
the Coast Guard by sending a distress call on Channel 16.
Or, transmit your distress call using digital selective calling on
Channel 70.
NOTE
A WARNING STICKER is supplied with the transceiver.
To comply with FCC regulations, this sticker must be affixed in
such a location as to be readily seen from the operating con-
trols of the radio as in the diagram below. Make sure the cho-
sen location is clean and dry before applying the sticker.
(p. 32)
EXAMPLE
WARNING
STICKER
USING DIGITAL SELECTIVE CALLING
(Ch 70)
DISTRESS CALL PROCEDURE
1. While opening the key cover, push and hold
[DISTRESS] for 5 sec. until you hear 5 short beeps
change to one long beep.
2. Wait for an acknowledgment from a coast station.
Channel 16 is automatically selected.
3. Push and hold [PTT], then transmit the appropriate
information as listed above.
USING CHANNEL 16
DISTRESS CALL PROCEDURE
1. “MAYDAY MAYDAY MAYDAY.”
2. “THIS IS ...............” (name of vessel)
3. Your call sign or other indication of the vessel (AND 9-
digit DSC ID if you have one).
4. “LOCATED AT ...............” (your position)
5. The nature of the distress and assistance required.
6. Any other information which might facilitate the rescue.
iii
RADIO OPERATOR WARNING
Icom requires the radio operator to meet the
FCC Requirements for Radio Frequency Expo-
sure. An omnidirectional antenna with gain not
greater than 9 dBi must be mounted a minimum
of 5 meters (measured from the lowest point of
the antenna) vertically above the main deck and
all possible personnel. This is the minimum safe separation
distance estimated to meet all RF exposure compliance re-
quirements. This 5 meter distance is based on the FCC Safe
Maximum Permissible Exposure (MPE) distance of 3 meters
added to the height of an adult (2 meters) and is appropriate
for all vessels.
For watercraft without suitable structures, the antenna must
be mounted so as to maintain a minimum of 1 meter vertically
between the antenna, (measured from the lowest point of the
antenna), to the heads of all persons AND all persons must
stay outside of the 3 meter MPE radius.
Do not transmit with radio and antenna when persons are
within the MPE radius of the antenna, unless such persons
(such as driver or radio operator) are shielded from antenna
field by a grounded metallic barrier. The MPE Radius is the
minimum distance from the antenna axis that person should
maintain in order to avoid RF exposure higher than the allow-
able MPE level set by FCC.
WARNING
FAILURE TO OBSERVE THESE LIMITS MAY ALLOW
THOSE WITHIN THE MPE RADIUS TO EXPERIENCE RF
RADIATION ABSORPTION WHICH EXCEEDS THE FCC
MAXIMUM PERMISSIBLE EXPOSURE (MPE) LIMIT.
IT IS THE RESPONSIBILITY OF THE RADIO OPERATOR
TO ENSURE THAT THE MAXIMUM PERMISSIBLE EXPO-
SURE LIMITS ARE OBSERVED AT ALL TIMES DURING
RADIO TRANSMISSION. THE RADIO OPERATOR IS TO
ENSURE THAT NO BYSTANDERS COME WITHIN THE
RADIUS OF THE MAXIMUM PERMISSIBLE EXPOSURE
LIMITS.
Determining MPE Radius
THE MAXIMUM PERMISSIBLE EXPOSURE (MPE) RA-
DIUS HAS BEEN ESTIMATED TO BE A RADIUS OF
ABOUT 3M PER OET BULLETIN 65 OF THE FCC.
THIS ESTIMATE IS MADE ASSUMING THE MAXIMUM
POWER OF THE RADIO AND ANTENNAS WITH A MAXI-
MUM GAIN OF 9dBi ARE USED FOR A SHIP MOUNTED
SYSTEM.
iv
FOREWORD …………………………………………………………… i
IMPORTANT …………………………………………………………… i
EXPLICIT DEFINITIONS ……………………………………………… i
IN CASE OF EMERGENCY…………………………………………… ii
NOTE …………………………………………………………………… ii
RADIO OPERATOR WARNING ……………………………………… iii
TABLE OF CONTENTS ……………………………………………… iv
PRECAUTIONS ………………………………………………………… v
1 OPERATING RULES ……………………………………………… 1
2 PANEL DESCRIPTION ………………………………………… 2–4
Front panel ……………………………………………………… 2
Microphone ……………………………………………………… 3
Function display ………………………………………………… 4
3 BASIC OPERATION …………………………………………… 5–9
Channel selection ……………………………………………… 5
Receiving and transmitting……………………………………… 7
Call channel programming ……………………………………… 8
Channel comments ……………………………………………… 8
Microphone lock function ……………………………………… 9
Display backlighting……………………………………………… 9
AquaQuake water draining function …………………………… 9
4 SCAN OPERATION ………………………………………… 10–11
Scan types ……………………………………………………… 10
Setting TAG channels ………………………………………… 11
Starting a scan ………………………………………………… 11
5 DUALWATCH/TRI-WATCH ……………………………………… 12
Description ……………………………………………………… 12
Operation ……………………………………………………… 12
6 DSC OPERATION …………………………………………… 13–27
MMSI code programming……………………………………… 13
MMSI code check ……………………………………………… 13
DSC address ID………………………………………………… 14
Position indication ……………………………………………… 15
Distress call …………………………………………………… 16
Transmitting DSC calls ………………………………………… 17
Receiving DSC calls …………………………………………… 24
7 SET MODE …………………………………………………… 28–30
Set mode programming ……………………………………… 28
Set mode items ………………………………………………… 29
8 CONNECTIONS AND MAINTENANCE …………………… 31–34
Connections …………………………………………………… 31
Supplied accessories ………………………………………… 32
Antenna ………………………………………………………… 32
Fuse replacement ……………………………………………… 32
Cleaning ………………………………………………………… 32
Mounting the transceiver ……………………………………… 33
Optional MB-92 attachment …………………………………… 33
Optional MB-69 installation …………………………………… 34
9 TROUBLESHOOTING …………………………………………… 35
10 CHANNEL LIST…………………………………………………… 36
11 SPECIFICATIONS AND OPTIONS ……………………… 37–38
Specifications …………………………………………………… 37
Options ………………………………………………………… 38
12 TEMPLATE ……………………………………………………… 39
TABLE OF CONTENTS
v
PRECAUTIONS
RWARNING! NEVER connect the transceiver to an AC
outlet. This may pose a fire hazard or result in an electric
shock.
CAUTION: Changes or modifications to this device, not ex-
pressly approved by Icom Inc., could void your authority to
operate this device under FCC regulations.
NEVER connect the transceiver to a power source of more
than 16 V DC or use reverse polarity. This will ruin the trans-
ceiver.
NEVER cut the DC power cable between the DC plug and
fuse holder. If an incorrect connection is made after cutting,
the transceiver may be damaged.
NEVER place the transceiver where normal operation of the
vessel may be hindered or where it could cause bodily injury.
KEEP the transceiver at least 3.3 ft (1 m) away from the
ship’s navigation compass.
DO NOT use or place the transceiver in areas with temper-
atures below –4°F (–20°C) or above +140°F (+60°C) or, in
areas subject to direct sunlight, such as the dashboard.
AVOID the use of chemical agents such as benzine or al-
cohol when cleaning, as they may damage the transceiver
surfaces.
BE CAREFUL! The transceiver rear panel will become
hot when operating continuously for long periods.
Place the transceiver in a secure place to avoid inadvertent
use by children.
BE CAREFUL! The transceiver (except cables) and hand
microphone employ waterproof construction, which corre-
sponds to IPX7 of the international standard IEC 60529
(2001). However, once the transceiver has been dropped,
waterproofing cannot be guaranteed due to the fact that the
case may be cracked, or the waterproof seal damaged, etc.
1
1
OPERATING RULES
DD
PRIORITIES
Read all rules and regulations pertaining to priorities and
keep an up-to-date copy handy. Safety and distress calls
take priority over all others.
You must monitor Channel 16 when you are not operating
on another channel.
False or fraudulent distress signals are prohibited and pun-
ishable by law.
DD
PRIVACY
Information overheard but not intended for you cannot law-
fully be used in any way.
Indecent or profane language is prohibited.
DD
RADIO LICENSES
(1) SHIP STATION LICENSE
You must have a current radio station license before using the
transceiver. It is unlawful to operate a ship station which is not
licensed.
Inquire through your dealer or the appropriate government
agency for a Ship-Radiotelephone license application. This
government-issued license states the call sign which is your
craft’s identification for radio purposes.
(2) OPERATOR’S LICENSE
A Restricted Radiotelephone Operator Permit is the license
most often held by small vessel radio operators when a radio
is not required for safety purposes.
The Restricted Radiotelephone Operator Permit must be
posted or kept with the operator. Only a licensed radio opera-
tor may operate a transceiver.
However, non-licensed individuals may talk over a transceiver
if a licensed operator starts, supervises, ends the call and
makes the necessary log entries.
Keep a copy of the current government rules and regulations
handy.
Radio license for boaters (U.S.A. only)
The Telecommunications Act of 1996 permits recreational
boaters to have and use a VHF marine radio, EPIRB, and
marine radar without having an FCC ship station license.
Boaters traveling on international voyages, having an HF
single sideband radiotelephone or marine satellite termi-
nal, or required to carry a marine radio under any other
regulation must still carry an FCC ship station license. For
further information, see the FCC Ship Radio Stations Fact
Sheet.
1
2
PANEL DESCRIPTION
2
Front panel
q CHANNEL UP/DOWN KEYS [
YY
]/[
ZZ
]•[U/I/C]
Selects the operating channels, Set mode settings, etc.
(pgs. 5, 6, 28)
While pushing and holding [SCAN], push to adjust the
brightness of the LCD and key backlight. (p. 9)
Selects one of three channel groups in sequence when
both keys are pushed. (p. 6)
U.S.A., International and Canadian channels are available.
While turning power ON, push and hold both keys to ac-
tivate the AquaQuake function. (p. 9)
w POWER/VOLUME CONTROL [VOL] (p. 7)
Rotate to turn the transceiver power ON and OFF and ad-
justs the audio level.
e SQUELCH CONTROL [SQL] (p. 7)
Rotate to set the squelch threshold level.
r CHANNEL 16/CALL CHANNEL KEY [!6•9]
Push to select Channel 16. (p. 5)
Push and hold for 1 sec. to select call channel. (p. 5)
•“CALL” appears when the call channel is selected.
Push and hold for 3 sec. to enter call channel program-
ming condition when the call channel is selected. (p. 8)
While pushing and holding [CH/WX], push to enter the
channel comments programming condition. (p. 8)
Push to move the cursor forward. (p. 8)
While turning power ON, push to enter Set mode. (p. 28)
t CHANNEL/WEATHER CHANNEL KEY [CH/WX•DUAL]
Selects and toggles the regular channel and weather
channel when pushed momentarily. (p. 6)
Push and hold for 1 sec. to start Dualwatch or Tri-watch.
(p. 12)
Push to stop Dualwatch or Tri-watch when either is acti-
vated. (p. 12)
Push to move the cursor backward. (p. 8)
Speaker Function display (p. 4)
q
ertyui
w
3
2
PANEL DESCRIPTION
y SCAN KEY [SCAN•TAG] (p. 11)
Push to start or stop the Normal or Priority scan.
Push and hold for 1 sec. to set or clear the displayed
channel as a TAG (scanned) channel.
• The favorite channels are set by the TAG channel setting.
While pushing and holding [HI/LO] on the microphone,
push for 3 sec. to clear all TAG channels in the selected
channel group.
• Repeat above procedure to set all TAG channels.
u DISTRESS KEY [DISTRESS] (p. 16)
Push and hold for 5 sec. to transmit a Distress call.
i DSC/POSITION KEY [DSC•POS]
Push to enter DSC menu. (p. 13)
Push and hold for 1 sec. to show the current position
from a GPS receiver. (p. 15)
Microphone
q PTT SWITCH [PTT]
Push and hold to transmit; release to receive. (p. 7)
w CHANNEL UP/DOWN KEYS [
YY
]/[
ZZ
]
Push either key to change the operating channel, Set
mode settings, etc. (pgs. 5, 6, 28)
When the Favorite channel function is turned ON, push
either key to select the favorite channels in the selected
channel group in sequence. (p. 30)
e TRANSMIT POWER KEY [HI/LO]
Push to toggle the power high and low. (p. 7)
• Some channels are set to low power only.
While pushing and holding [HI/LO], turn power ON to
toggle the Microphone Lock function ON and OFF.
(p. 9)
Microphone
w
q
e
2
5
3
BASIC OPERATION
2
3
Channel selection
ïï
Channel 16
Channel 16 is the distress and safety channel. It is used for
establishing initial contact with a station and for emergency
communications. Channel 16 is monitored during both Dual-
watch and Tri-watch. While standing by, you must monitor
Channel 16.
Push [!6] momentarily to select Channel 16.
Push [CH/WX] to return to the condition before selecting
Channel 16, or push [Y] or [Z] to select operating chan-
nel.
Convenient!
When the Favorite channel function is turned ON (p. 30),
[Y]/[Z] keys on the microphone select the favorite channels
in the selected channel group in sequence when pushed.
• The favorite channels are set by the TAG channel setting. (p. 11)
ïï
Channel 9 (Call channel)
Each regular channel group has a separate leisure-use call
channel. The call channel is monitored during Tri-watch. The
call channels can be programmed (p. 8) and are used to store
your most often used channels in each channel group for
quick recall.
Push and hold [9] (!6) for 1 sec. to select the call channel
of the selected channel group.
•“CALL” and call channel number appear.
• Each channel group may have an independent call channel after
programming a call channel. (p. 8)
Push [CH/WX] to return to the condition before selecting
call channel, or push [Y] or [Z] to select a channel.
Push
for 1 sec.
Scrolls
Push
Scrolls
6
3 BASIC OPERATION
ïï
U.S.A.,Canadian and international channels
The IC-M304 is pre-programmed with 59 U.S.A., 59 interna-
tional and 63 Canadian channels. These channel groups may
be specified for the operating area.
q Push [CH/WX] to select a regular channel.
• If a weather channel appears, push [CH/WX] again.
w Push [U/I/C] (both [Y] and [Z]) on the transceiver to
change the channel group, if necessary.
U.S.A., International and Canadian channel groups can be se-
lected in sequence.
e Push [Y] or [Z] to select a channel.
• “ ” appears for duplex channels.
ïï
Weather channels
The IC-M304 has 10 pre-programmed weather channels.
These are used for monitoring broadcasts from NOAA (Na-
tional Oceanic and Atmospheric Administration.)
The transceiver can automatically detect a weather alert tone
on the selected weather channel while receiving the channel
or during scanning. (p. 29)
q Push [CH/WX] once or twice to select a weather channel.
•“WX” appears when a weather channel is selected.
• “WX ALT” appears when the Weather alert function is in use.
(p. 29)
w Push [Y] or [Z] to select a channel.
Push once or twice
When Weather alert is OFF.
When Weather alert is ON.
and )
Push [U/I/C] (both
7
3
BASIC OPERATION
3
Receiving and transmitting
CAUTION: Transmitting without an antenna will damage
the transceiver.
q Rotate [VOL] to turn power ON.
w Set the audio and squelch levels.
Rotate [SQL] fully counterclockwise in advance.
Rotate [VOL] to adjust the audio output level.
Rotate [SQL] clockwise until the noise disappears.
e Push [U/I/C] (both [Y] and [Z]) on the transceiver several
times to select the desired channel group. (p. 6)
r Push [Y] or [Z] to select a channel. (p. 5)
When receiving a signal, “ ” appears and audio is emitted
from the speaker.
• Further adjustment of [VOL] may be necessary.
t Push [HI/LO] on the microphone to select the output
power if necessary.
•“LOW” appears when low power is selected.
• Choose low power for short range communications, choose high
power for longer distance communications.
• Some channels are for low power only.
y Push and hold [PTT] to transmit, then speak into the mi-
crophone.
• “ ” appears.
• Channel 70 cannot be used for transmission other than DSC.
u Release [PTT] to receive.
Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CAN-
NOT be lawfully used by the general public in U.S.A. wa-
ters.
IMPORTANT: To maximize the readability of your trans-
mitted signal, pause a few sec. after pushing [PTT], hold
the microphone 2 to 4 inches (5 to 10 cm) from your mouth
and speak into the microphone at a normal voice level.
NOTE for TOT (Time-out Timer) function
The TOT function inhibits continuous transmission over a pre-
set time period after the transmission starts.
u
rt
yq
Microphone
w
re
25
6
DSC OPERATION
6
D Receiving an Individual call
While monitoring Channel 70 and an Individual call is re-
ceived:
The emergency alarm or beeps sound depending on the
received category.
DSC” appears and “ ” scrolls at the channel
comment indicator.
Push any key to stop beep, then push [DSC] to reply the
call and select the channel specified by the calling station
for voice communication (depending on your replying con-
dition see p. 18 for individual acknowledgement call pro-
cedure for details.); push any other key to ignore the Indi-
vidual call.
D Receiving a Group call
While monitoring Channel 70 and a Group call is received:
The emergency alarm or beeps sound depending on the
received category.
DSC” appears and “ ” scrolls at the channel
comment indicator.
Push any key to stop beep, then push [DSC] to select the
channel specified by the calling station for voice commu-
nication; push any other key to ignore the Group call.
Scrolls
Scrolls
26
6 DSC OPERATION
D Receiving an All Ships call
While monitoring Channel 70 and an All Ships call is received:
The emergency alarm sounds when the category is ‘Dis-
tress’ or ‘Urgency’; 2 beeps sound for other categories.
DSC” appears and “ ” scrolls at the channel
comment indicator.
Push any key to stop beep, then push [DSC] to monitor
channel 16 for an announcement from the calling vessel,
push any other key to ignore the call.
D Receiving a Geographical Area call
While monitoring Channel 70 and a Geographical Area call
(for the area you are in) is received:
The emergency alarm or beeps sound depending on the
received category.
DSC” appears and “ ” scrolls at the chan-
nel comment indicator.
Push any key to stop the beep, then push [DSC] to change
to the channel specified by the calling station for voice
communication; push any other key to ignore the Geo-
graphical Area call.
Monitor the selected channel for an announcement from
the calling station.
When no GPS receiver is connected or if there is a prob-
lem with the connected receiver, all Geographical Area
calls are received, regardless of your position.
Scrolls
Scrolls
27
6
DSC OPERATION
6
D Receiving a Position Request call
While monitoring Channel 70 and a Position Request call is
received:
DSC” appears and “ ” scrolls at the chan-
nel comment indicator.
Push any key to stop the beep, then push [DSC] to reply to
the call; push any other key to ignore the call.
D Receiving a Position Report call
While monitoring Channel 70 and a Position Report call is re-
ceived:
DSC” appears and “ ” scrolls at the chan-
nel comment indicator.
Push any key to stop the beep, then push [DSC] to reply to
the call; push any other key to ignore the call.
• The ‘Latitude’ and ‘Longitude’ from the called station is displayed
and scrolled automatically in order of Latitude co-ordinates and
then Longitude co-ordinates after replying the call.
D Receiving a Position Reply call
While monitoring Channel 70 and a Position Reply call is re-
ceived:
DSC” and “POS REPLY” appear in the display.
• The ‘Latitude’ and ‘Longitude’ from the called station is displayed
and scrolled automatically in order of Latitude co-ordinates and
then Longitude co-ordinates.
Push any key to stop the beep.
D Receiving a Position Report Reply call
While monitoring Channel 70 and a Position Report Reply call
is received:
DSC” and “POS REPLY” appear in the display.
The ‘Latitude’ and ‘Longitude’ you have sent is displayed and
scrolled automatically in order of Latitude co-ordinates and then
Longitude co-ordinates.
Push any key to stop the beep.
Scrolls
Scrolls
Scrolls
Scrolls
38
11 SPECIFICATIONS
DD
Dimensions
Options
MB-69
FLUSH MOUNT KIT
For mounting the transceiver to a panel.
MB-92
DUST COVER
For attaching to the front panel of the transceiver to protect it
when not in use.
Unit: mm (inch)
153.0 (6
1
32)
67.0 (2
5
8)
143.5 (5
21
32)
51.0 (2)
42.2
(1
21
32)
86.3 (3
13
32)
137.0 (5
13
32)
133 (5
1
4)
39
12
TEMPLATE
11
12
Cut here
NOTE: The solid line is the line to use when cutting into the dash/helm. The dotted
line shows the outline of the IC-M304’s front panel once the radio is fitted into the
hole. Do not follow the dotted line when making the hole in your dash/helm.
MEMO
4


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