INSTRUCTION MANUAL

VHF MARINE TRANSCEIVER

FOREWORD

Thank you for purchasing this Icom product. The IC-M504 vhf marine transceiver is designed and built with Icoms state of the art technology and craftsmanship. With proper care, this product should provide you with years of troublefree operation. We want to take a couple of moments of your time to thank you for making the IC-M504 your radio of choice, and hope you agree with Icoms philosophy of technology first. Many hours of research and development went into the design of your IC-M504.

IMPORTANT

READ ALL INSTRUCTIONS carefully and completely
before using the transceiver.
SAVE THIS INSTRUCTION MANUAL This instruction manual contains important operating instructions for the IC-M504.

EXPLICIT DEFINITIONS

WORD RWARNING CAUTION NOTE DEFINITION Personal injury, fire hazard or electric shock may occur. Equipment damage may occur. If disregarded, inconvenience only. No risk of personal injury, fire or electric shock.

D FEATURES

Simple operation with large keys Easy to hear speaker Built-in DSC meets ITU Class D requirement Rugged waterproof construction ptional COMMANDMIC (HM-162/HM-157) O are available
Icom, Icom Inc. and the logo are registered trademarks of Icom Incorporated (Japan) in the United States, the United Kingdom, Germany, France, Spain, Russia and/or other countries. COMMANDMIC II and COMMANDMIC III is a trademark of Icom Incorporated (Japan) in the United States.
CLEAN THE TRANSCEIVER AND MICROPHONE THOROUGHLY WITH FRESH WATER after exposure to water including salt, otherwise, the keys and switch may become inoperable due to salt crystallization.

IN CASE OF EMERGENCY

If your vessel requires assistance, contact other vessels and the Coast Guard by sending a Distress call on Channel 16.
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 controls of the radio as in the diagram below. Make sure the chosen location is clean and dry before applying the sticker. EXAMPLE
USING CHANNEL 16 DISTRESS CALL PROCEDURE
1. MAYDAY MAYDAY MAYDAY. 2. THIS IS.. (name of vessel). 3. Say your call sign or other indication of the vessel (AND 9-digit DSC ID if you have one). 4. LOCATED AT.. (your position). 5. State the nature of the distress and assistance required. 6. Give any other information which might facilitate the rescue. Or, transmit your Distress call using digital selective calling on Channel 70.

WARNING STICKER

1. h i l e l i f t i n g u p t h e key c ove r, p u s h a n d h o l d W [DISTRESS] for 5 sec. until you hear 5 short beeps change to one long beep. 2. Wait for an acknowledgment on Channel 70 from a coast station.
fter the acknowledgement is received, Channel 16 is autoA matically selected.
USING DIGITAL SELECTIVE CALLING (Ch 70) DISTRESS CALL PROCEDURE
3. Push and hold [PTT], then transmit the appropriate information as listed above. ii

u HANNEL SELECTOR [DIALENTER] C otate to select the operating channels, Set mode setR tings, etc. (pgs. 68, 55) hile pushing and holding [H/L], rotate to adjust the W brightness of the LCD and key backlight. (p. 10) ush to enter the input channel comment, selected P item, etc. (pgs. 10, 55) otate to check TAG channels, changes scanning diR rection or resumes the scan manually during scan. (p. 13) hile pushing and holding [HAILRX ], rotate to adW just the audio level in RX Speaker mode. (p. 51) ush and hold for 1 sec. to display the GPS information P when a GPS receiver is connected. (p. 22) i HANNEL/WEATHER CHANNEL KEY C [CH/WXDUALU/I/C] elects and toggles the regular channel and Weather S channel when pushed momentarily. (p. 7) ush and hold for 1 sec. to start Dualwatch or TriP watch. (p. 14) ush to stop Dualwatch or Tri-watch when either is acP tivated. (p. 14) ove the cursor backward while in the channel comM ment programming condition. (p. 10) hile pushing and holding [H/L], push to select one of W three channel groups in sequence. (p. 7)
.S.A., International and Canadian channels are available. U
o SQUELCH CONTROL [SQL] Rotate to set the squelch threshold level. (p. 8) !0 CAN/TAG KEY [SCANTAG] (p. 13) S ush to start and stop Normal or Priority scan. P ush and hold for 1 sec. to set or clear the displayed P channel as a TAG (scanned) channel. hile pushing and holding [H/L], push for 3 sec. to W clear or set all TAG channels in the selected channel group. !1 VOLUME CONTROL [VOL] (p. 8) Rotate to adjust the audio level. !2 TRANSMIT POWER KEY [H/L] Push to toggle the power high or low. (p. 8)
Some channels are set to low power only.
hile pushing this key, some keys perform secondary W functions. !3 POWER KEY [POWER] (p. 8) Push to turn power ON. Push and hold for 1 sec. to turn power OFF.

Function display

q w e r t !5 !4 !3 !2 !1 !0 y y CALL CHANNEL INDICATOR (pgs. 6, 9) Appears when the call channel is selected. u LOW BATTERY INDICATOR Blinks when the battery voltage drops to approx. 10 V DC or below. i CHANNEL NUMBER READOUT Indicates the selected operating channel number. o CHANNEL COMMENT INDICATOR Channel comment appears if programmed. (p. 10)
BUSY 25W INT LOC RX DUP SCRAM TAG NORMAL SCAN -34 34.506N 123 23.236W Local 1:10

CALLING

!0 TIME ZONE INDICATOR hows the current time data when a GPS receiver is S connected.
?? may blink every 2 sec. instead of current time data when the GPS current time data is invalid. ?? may blink every 2 sec. instead of current time data 4 hours after the time data is input manually, up until 23.5 hours have past.

ancel Dualwatch, Tri-watch or Scan in advance. C

Microphone Lock function

The Microphone Lock function electrically locks [Y]/[Z] and [HI/LO] keys on the supplied microphone. This prevents accidental channel changes and function access. hile pushing and holding [HI/LO] on the microphone, W turn power ON to toggle the Lock function ON and OFF.
w hile pushing and holding [H/L], push [169] to edit the W channel comment.
cursor and the first charA acter star t blinking alternately.

25W INT

[Y]/[Z]
34 34.506N 123 23.236W UTC 12:00PLEASURE__
e elect the desired charS acter by rotating [DIAL].
ush [169] or [CH/WX P DUALU/I/C] to move the cursor forward or backward, respectively.

[HI/LO]

r Repeat step e to input all characters. t Push [DIALENTER] to input and set the comment.
y epeat steps q to t to program other channel comR ments, if desired.
ush [CLR] to cancel. P The cursor and the character stop blinking.

Display backlight

The function display and keys can be backlit for better visibility under low light conditions. hile pushing and holding [H/L], rotate [DIAL] to adjust W the brightness of the LCD and key backlight.
The backlight is adjustable in 7 levels and OFF.
Optional voice scrambler operation
The optional voice scrambler provides private communications. In order to receive or send scrambled transmissions you must first activate the scrambler function. To activate the function, an optional scrambler unit is necessary. See pgs. 57, 62 for setting the scrambler unit. Ask your dealer for details. The scrambler function automatically turns OFF when Channel 16 or 70 is selected. q otate [DIAL] to select an operating channel other than R Channel 16 and 70. w hile pushing and holding [H/L], push [LO/DXICSCRM] W to turn the optional scrambler function ON. SCRAM appears. e o turn the scrambler function OFF, repeat step w. T SCRAM disappears. [Example]: Programming scrambler code 5.
--Set Mode-Scan Type Scan Timer WX Alert Dual/Tri Beep Contrast Foghorn Frequency
DActivating the scrambler
There are 32 codes (1 to 32) or 128 codes (0 to 127)* available for programming when an optional scrambler unit is installed. In order to understand one another, all transceivers in your group must have the same scramble code. This function may not be available depending on dealer setting.
*Depends on the installed scrambler unit.
DProgramming scrambler codes
q Turn power OFF. w While pushing [169], turn power ON to enter set mode. e After the display appears, release [169]. r otate [DIAL] to select the Scrambler Code, push R [DIALENTER]. t otate [DIAL] to select the desired scrambler code. R y ush [DIALENTER] to set and exit the scrambler code P item. u ush [CLR], or rotate [DIAL] to select Exit, push P [DIALENTER] to exit set mode.

Rotate

to enter set mode.
to select item, then push.
--Set Mode-Dual/Tri Beep Contrast Foghorn Frequency Radio Power Scrambler Type Scrambler Code

Select

to select code, then push.
--Set Mode-Scrambler Code 5 Select <ENT OK>

SCAN OPERATION

Scan types
Scanning is an efficient way to locate signals quickly over a wide frequency range. The transceiver has Priority scan and Normal scan. When the Weather Alert function is turned ON, the previously selected (last used) weather channel is also checked while scanning. (p. 56) PRIORITY SCAN

CH 01 CH 02

Set the TAG channels (scanned channel) before scanning. Clear the TAG channels which inconveniently stop scanning, such as those for digital communication use. (Refer to right page for details.) Choose Priority or Normal scan in Set mode. (p. 55) NORMAL SCAN
Priority scan searches through all TAG channels in sequence while monitoring Channel 16. When a signal is detected on Channel 16, scan pauses until the signal disappears; when a signal is detected on a channel other than Channel 16, scan becomes Dualwatch until the signal disappears. 12
Normal scan, like Priority scan, searches through all TAG channels in sequence. However, unlike Priority scan, Channel 16 is not checked unless Channel 16 is set as a TAG channel.

Setting TAG channels

For more efficient scanning, add the desired channels as TAG channels or clear the TAG for unwanted channels. Channels that are not tagged will be skipped during scanning. TAG channels can be assigned to each channel group (USA, INT, CAN) independently. q hile pushing and holding [H/L], push [CH/WXDUALU/I/C] W to select the desired channel group (USA, INT or CAN.) w Select the desired channel to be set as a TAG channel. e ush [SCANTAG] for 1 sec. to set the displayed channel P as a TAG channel.
TAG appears in the display. TAG disappears.

Starting a scan

Set scan type (Priority or Normal scan) and scan resume timer in advance, using Set mode. (p. 55) q hile pushing and holding [H/L], push [CH/WXDUAL W U/I/C] to select the desired channel group (USA, INT, CAN) if desired. w et TAG channels as described at left. S e ake sure the squelch is closed to start a scan. M r Push [SCANTAG] to start Priority or Normal scan.
PRI-SCAN 16 appears at the channel comment indicator during Priority scan. NORMAL SCAN appears at the channel comment indicator during Normal scan. hen a signal is detected, scan pauses until the signal disapW pears or resumes after pausing 5 sec. according to Set mode setting. (Channel 16 is still monitored during Priority scan.) otate [DIAL] to check the scanning TAG channels, to change R the scanning direction or resume the scan manually. beep tone sounds and 16 blinks at the channel comment A indicator when a signal is received on Channel 16 during Priority scan.

r o cancel the TAG channel setting, repeat step e. T Clearing (or setting) all tagged channels While pushing and holding [H/L], push [SCANTAG] for 3 sec. (until a long beep changes to 2 short beeps) to clear all TAG channels setting in the channel group.
Repeat above procedure to set all TAG channels.
[Example]: Starting a normal scan.

Scan starts.

INT DUP TAG NORMAL SCAN 34 34.506N 123 23.236W UTC 12:00 25W
When a signal is received

BUSY 25W INT DUP

NORMAL SCAN 34 34.506N 123 23.236W UTC 12:00

SAFETY

DUALWATCH/TRI-WATCH

Operation

q Select Dualwatch or Tri-watch in Set mode. (p. 56) w Rotate [DIAL] to select the desired operating channel. e ush [CH/WXDUALU/I/C] for 1 sec. to start Dualwatch P or Tri-watch.
DUAL 16 appears during Dualwatch; TRI 16 appears during Tri-watch. A beep tone sounds when a signal is received on Channel 16.

Description

Dualwatch monitors Channel 16 while you are receiving on another channel; Tri-watch monitors Channel 16 and the call channel while receiving another channel. Dualwatch/Triwatch is convenient for monitoring Channel 16 when you are operating on another channel. DUALWATCH/TRI-WATCH SIMULATION Call channel
r o cancel Dualwatch/Tri-watch, push [CH/WXDUALU/I/C] T again. [Example]: Operating Tri-watch on INT Channel 25

Tri-watch starts.

Signal is received on call channel.
BUSY 25W INT CALL TAG TRI 34.506N 123 23.236W UTC 12:00

TRI 16

Dualwatch

Tri-watch

34 34.506N 123 23.236W UTC 12:00 TELEPHONE
f a signal is received on Channel 16, Dualwatch/TriI watch pauses on Channel 16 until the signal disappears. f a signal is received on the call channel during TriI watch, Tri-watch becomes Dualwatch until the signal disappears. o transmit on the selected channel during Dualwatch/ T Tri-watch, push and hold [PTT].
Tri-watch resumes after the signal disappears.
Signal received on Channel 16 takes priority.
TRI 34.506N 123 23.236W UTC 12:00 TELEPHONE

DSC OPERATION

MMSI code programming
The 9-digit MMSI (Maritime Mobile Service Identity: DSC self ID) code can be programmed at power ON. This code programming can be performed only twice. After the code programming, it can be changed only by your dealer or distributor. qTurn power OFF. w hile pushing [MENU], turn power ON to enter MMSI W code programming condition. eAfter the display appears, release [MENU]. r ush [MENU] again to enter the DSC menu. P t otate [DIAL] to select Set up, push [DIALENTER]. R
--DSC Menu-Select Item Position Input Received Calls Set up Exit
u otate [DIAL] to set the specific 9-digit MMSI code. R

he distress call is automatically transmitted every 3.5 to 4.5 T minutes. After 2 sec., the transceiver is set to Channel 16 automatically.
Distress Call TX Complete Now Waiting for ACK
NEVER USE THE DISTRESS CALL WHEN YOUR SHIP OR A PERSON IS NOT IN AN EMERGENCY. A DISTRESS CALL CAN BE USED ONLY WHEN IMMEDIATE HELP IS NEEDED.

DSimple call

qConfirm no distress call is being received. w hile lifting up the key cover, push [DISTRESS] for W 5 sec. to transmit the distress call.
mergency channel (Channel 70) is automatically selected and E the distress call is transmitted. hen no GPS is connected, input your position and UTC time, W if possible. hile pushing [DISTRESS], the key backlighting blinks. W
Distress Call Push for 5 sec.

<CLR Cancel>

25W TAG

After 2 sec.

Wait ACK <CLR Cancel> CALLING
r fter receiving the acknowledgment, reply using the miA crophone.
TAG Received DistressACK <Osaka Bay <CLR Beep Off>
A distress alert contains (default);
Nature of distress: Undesignated distress Position data : PS or manual input position data held G for 23.5 hrs or until the power is turned OFF.

DRegular call

The nature of the distress call should be included in the distress call. q ush [MENU] to enter the DSC menu. P w otate [DIAL] to select Distress Setting, and R push [DIALENTER].
--DSC Menu-Select Item All Ships Call Position Request Position Report Polling Request Received Calls Distress Setting
he distress call is repeated every 3.54.5 min., until T receiving an acknowledgement. Push [CLR] to cancel the Call repeat mode. ?? may blink instead of position and time indications when the GPS data is invalid, or has not been manually updated after 4 hours.
e otate [DIAL] to select the nature of the distress, push R [DIALENTER].
Undesignated, Explosion, Flooding, Colli sion, Grounding, Capsizing, Sinking, Adrift (Disable adrift), Abandoning (Abandoning ship), Piracy (Piracy attack) and MOB (Man overboard) are available. The selected nature of the distress is stored for 10 minutes.
--DSC Menu-Select Nature Undesignated Explosion Flooding Collision
Regardless of a GPS receiver (NMEA0183 ver. 2.0 or 3.01) connection, the current position/time information appears in steps r and t. If the information is not necessary to be changed, push [DIALENTER] or [169] several times to skip the data input steps. r he position information appears. Set your position (latiT tude and longitude) data by rotating [DIAL].
--DSC Menu-Input Position Latitude __ __.___N Null Longitude __ __.___W Null <CLR 1sec Null Data> <CLR Exit / ENT OK>
y ush [DISTRESS] for 5 sec. to transmit the distress call. P
hile pushing [DISTRESS], the key backlighting blinks. W
u fter transmitting the distress call, the transceiver waits A for an acknowledgment call on Channel 70.

Individual ACK item appears after an individual call is received.
--DSC Menu-Select Item Position Input Individual Call Individual ACK Group Call All Ships Call Position Request
y tandby on Channel 70 until an acknowledgement is reS ceived.
--DSC Menu-Individual Call TX Complete Now Waiting for ACK <CLR Exit>
u hen the acknowledgement Able to comply is received, W the specified channel (in step r) is selected with beeps automatically. Or, when the acknowledgement Unable to comply is received, the display returns to the operated channel (before enter the DSC menu) with beeps.
Received INDV ACK <John <CLR Beep Off> COMMERCIAL 25W INT DUP Received Unable ACK <John <CLR Beep Off>
e otate [DIAL] to select the desired individual address or R ID code, push [DIALENTER].
--DSC Menu-Select Address John Paul George Michael <CLR Exit / ENT OK>
i ush [CLR] to stop the beep, then push and hold [PTT] P to communicate your message to the responding ship.
DSC OPERATION D ransmitting a group call T
r otate [DIAL] to select Able to Comply or UnR able to Comply, push [DIALENTER].
hen Unable to Comply is selected, No Reason W Given will be transmitted.
--DSC Menu-Select Action Able to Comply Unable to Comply
The group call function allows you to transmit a DSC signal to a specific group only. q ush [MENU] to enter the DSC menu. P w o t a t e [ D I A L ] t o s e l e c t G r o u p C a l l , p u s h R [DIALENTER].
<CLR Exit / ENT OK> --DSC Menu-Individual ACK Ready
e otate [DIAL] to select the desired pre-programmed group R address or Manual Input, push [DIALENTER].
t ush [DIALENTER] to transmit the acknowledgement P call to the selected station. y fter the individual acknowledgement call has been A transmitted, the specified channel (specified by the calling station) is selected automatically when Able to Comply is selected, or returns to the previous condition (before entering the DSC menu) when Unable to Comply is selected in step r.
The ID code for the group call can be set in advance. (p. 19) hen Manual Input is selected, set the 8-digit ID code W for the group you wish to call by rotating [DIAL].

ven if [CLR] hasnt been pushed, the display automatically E returns to the previous indication after 2 sec. of inactivity.
r ush [DIALENTER] to transmit the position request call. P
--DSC Menu-Position Request
D ransmitting a position report call T
Transmit a position report call when you want to announce your own position to a specific ship and to get an answer, etc. q ush [MENU] to enter the DSC menu. P w otate [DIAL] to select Position Report, push R [DIALENTER].
he ID code can be set in advance. (p. 17) T hen Manual Input is selected, set the 9-digit MMSI W number for the individual you wish to call by rotating [DIAL].
u fter the position report call has been transmitted, the folA lowing indication is displayed.
--DSC Menu-Position Report TX Complete

Now Waiting for ACK

--DSC Menu-Position Report Ready
i ush [CLR] to return to the previous indication before enP tering the DSC menu.
y ush [DIALENTER] to transmit the position report call. P
--DSC Menu-Position Report
D ransmitting a polling request call T
Transmit a polling request call when you want to know if a specific vessel is within communication range. q ush [MENU] to enter the DSC menu. P w otate [DIAL] to select Polling Request, push R [DIALENTER].
--DSC Menu-Select Item Individual Call Group Call All Ships Call Position Request Position Report Polling Request --DSC Menu-Select Address Manual Input John Paul George Michael <CLR Exit / ENT OK> --DSC Menu-Polling Request Ready
r ush [DIALENTER] to transmit the polling request call. P
--DSC Menu-Polling Request
DSC OPERATION D ransmitting a position request reply call T
t fter the polling request call has been transmitted, the folA lowing indication is displayed.
--DSC Menu-Polling Request TX Complete Now Waiting for ACK <CLR Exit>
Transmit a position request reply call when a position request call is received. When the automatic acknowledgement function is ON (p. 48), the transceiver automatically transmits a reply call after receiving a position request call. q ush [MENU] to enter the DSC menu. P w otate [DIAL] to select Position Reply, push R [DIALENTER].

Push [CLR] to stop the alarm.
25W INT TAG Received DistressACK <Osaka Bay <CLR Beep Off>
Received Distress appears in the display, then Channel 16 is automatically selected. ontinue monitoring Channel 16 as a coast station may C require assistance.
25W TAG Received Distress <Paul <CLR Beep Off> INT
While monitoring Channel 70 and a distress relay acknowledgement is received: The emergency alarm sounds for 2 minutes.
DReceiving a distress relay call
Received DistressRLY appears in the display, then Channel 16 is automatically selected.
DReceiving a distress acknowledgement
While monitoring Channel 70 and a distress acknowledgement to other ship is received: The emergency alarm sounds for 2 minutes.
Received DistressACK appears in the display, then Channel 16 is automatically selected.
TAG Received DistressRLY <John <CLR Beep Off>
DSC OPERATION DReceiving a group call
While monitoring Channel 70 and a group call is received: he emergency alarm or beeps sound depending on the T received category. Received Group appears in the display. ush [CLR] to stop the beep, then push [DIALENTER] P to select the channel specified by the calling station for voice communication; push [CLR] to ignore the group call.
25W TAG Received Group <Icom <CLR Beep Off> INT
DReceiving an individual call
While monitoring Channel 70 and an individual call is received: he emergency alarm or beeps sound depending on the T received category. Received Individual appears in the display. ush [CLR] to stop the beep, then push [DIALENTER] to P reply the call and select the channel specified by the calling station for voice communication (depending on your replying condition see p. 28 for individual acknowledgement call procedure for details.); push [CLR] to ignore the individual call.
25W TAG Received Individual <Paul <CLR Beep Off> INT
DReceiving an all ships call
While monitoring Channel 70 and an all ships call is received: he emergency alarm sounds when the category is DisT tress or Urgency; beeps sound for 2 minutes. Received All Ships appears in the display. ush [CLR] to stop the beep, then push [DIALENTER] P to monitor channel 16 for an announcement from the calling vessel; push [CLR] to ignore the call.
DSC OPERATION DReceiving a position request call
25W TAG Received All Ships <Paul <CLR Beep Off>
While monitoring Channel 70 and a position request call is received: Received POS Request appears in the display. ush [CLR] to stop the beep, then push [DIALENTER] P to reply to the position request call; push [CLR] to ignore the position request call.

This item sets the automatic acknowledgement function to ON or OFF. When a position request, position report or polling request call is received, the transceiver automatically transmits a position request reply, position report reply or polling reply call, respectively. qPush [MENU] to enter the DSC menu. wRotate [DIAL] to select Set up, push [DIALENTER].
r otate [DIAL] to turn the automatic acknowledgement R function ON or OFF.
--DSC Menu-Auto ACK ON OFF
t ush [DIALENTER] to set the condition. P
Push [CLR] to cancel and return to the set up menu.
e o t a t e [ D I A L ] t o s e l e c t A u t o A C K , p u s h R [DIALENTER].
--DSC Menu-Select Item Add:Group ID DEL:INDV ID DEL:Group ID Offset Time MMSI Check Auto ACK
DSC OPERATION DNMEA Output
Select an NMEA Output function from OFF, All Station or List Station. When receiving position acknowledgment, the transceiver outputs it to the external equipment via the NMEA connector. qPush [MENU] to enter the DSC menu. w otate [DIAL] to select Set up, push [DIALENTER]. R
r otate [DIAL] to select the NMEA Output function from R OFF, All Station or List Station.
List Station: utputs the position data from the specified vesO sels listed on the DSC individual ID screen. All Station : Outputs the position data from all vessels. OFF : oes not output any position data to external D equipment.
--DSC Menu-NMEA Output List Station All Station OFF
e otate [DIAL] to select N M E A O u t p u t , push R [DIALENTER].
--DSC Menu-Select Item DEL:INDV ID DEL:Group ID Offset Time MMSI Check Auto ACK NMEA Output

OTHER FUNCTIONS

Intercom operation
The optional Intercom function allows you to talk to the deck from the cabin. The optional command microphone is required for Intercom operation. Connect an optional command microphone as described on p. 63. Transmitting is impossible during Intercom operation. The received signal is muted during Intercom operation. q ush and hold [LO/DXICSCRM] for 1 sec. to enter InP tercom mode.
he optional command microphone power is automatically T turned ON, even if the power is OFF. Push and hold for 1 sec.
e ush and hold [PTT] and speak at a normal voice level P into the microphone.
TALK or LISTEN* appears on the caller or listener func tion display. * or appears on the HM-157. o adjust the IC-M504s speaker output level, rotate [VOL]. T o adjust the HM-162s speaker output level, rotate [SELECT TOR] after pushing [VOL] on the HM-162. o adjust the HM-157s speaker output level, push [Y] or [Z] T after pushing [VOL DIM PA/RX ] on the HM-157.

INTERCOM TALK

INTERCOM LISTEN
HM-162 (listener) IC-M504 (caller)

TALK appears. WAIT appears at the channel comment indicator when the optional command microphone is in use. o adjust the hailer level, rotate [DIAL]. T
e o return to normal operation, push [CLR] or [HAILRX T
Automatic foghorn function
The automatic foghorn function sounds a horn repeatedly until the function is turned OFF. Four patterns are available for varying conditions. The foghorn outputs from the hailer speaker. To use this function, the hailer speaker must be connected to the transceiver. See p. 58 for connection details.

UNDERWAY

PATTERN
Motor vessel underway and making way.
One 5-second blasts every 120 seconds.
Two 5-second blasts (separated by 2 seconds) every 120 seconds. One 5-second blast followed by two 1-second blasts (each separated by 2 seconds) every 120 seconds. One 5-second blast followed by three 1-second blasts (each separated by 2-seconds) every 120 seconds.

2s 5s1 1s

Motor vessel underway but stopped (not making way).
Sailing vessel underway, fishing vessel (underway or anchored), vessel not under command, a vessel restricted in her ability to maneuver (underway or at anchor), or a vessel towing or pushing another ahead.
Vessel under tow (manned).

2s 120s

The audio frequency of the foghorn is selectable. See p. 57 for details on selecting the audio frequency. 53
] to e otate [DIAL] to adjust the foghorn level, push [DIAL R ENTER].
he foghorn level is adjustable in 30 steps. T ven if [ENT] hasnt been pushed, the display automatically E changes to the next step after 5 sec. of inactivity. Rotate
CALLING 25W TAG FOGHORN 15 <ENT OK> CALLING 25W TAG FOGHORN 15 UNDERWAY CALLING INT INT
q hile pushing and holding [H/L], push [HAILRX W enter auto foghorn mode.
UNDERWAY STOP <ENT OK>
w otate [DIAL] to select the desired foghorn pattern, push R [DIALENTER].
UNDERWAY, STOP, SAIL, TOW are available. (p. 53) ven if [DIALENTER] hasnt been pushed, the display autoE matically changes to the next step after 5 sec. of inactivity.
The selected foghorn pattern is displayed.
r o return to normal operation, repeat step q. T When a DSC call is received, the automatic foghorn function is interrupted with an automatic return to the transceiver mode. The transceivers display indicates Receiving DSC calls. (p. 41)

SET MODE

Set mode programming
Set mode is used to change the conditions of the transceivers functions: Scan type, Scan resume timer, Weather alert, Dual/ Tri-watch, Beep tone, LCD contrast, Automatic foghorn frequency, Radio power, Scrambler type* and Scrambler code.*

Default: ON

DLCD contrast

The LCD contrast can be adjustable to 8 levels. The level 1 is the lowest contrast, and the level 8 is the highest contrast.
--Set Mode-Contrast 1 <ENT OK>

DDual/Tri-watch

This item can be selected as Dualwatch or Tri-watch. (p. 14)
--Set Mode-Dual/Tri Tri-watch Dualwatch

Default: 5

Default: Dualwatch
SET MODE DAutomatic foghorn frequency D crambler type S
The audio frequency of the automatic foghorn can be adjusted to suit your preference. While this item is selected, pushing [PTT] outputs the foghorn experiment with the frequencies available until you find one you like.
vailable frequency range is 200 Hz to 850Hz in 50 Hz steps. A
--Set Mode-Foghorn Frequency 200 <ENT OK>
(Appears when a scrambler unit is installed) When an optional scrambler unit is installed, the scrambler type can be selected in set mode depending on how it is set by the dealer.
--Set Mode-Scrambler Type UT-98 UT-112

Default: UT-112

Default: 400
This item sets the Radio Power function ON or OFF. ON : he transceivers power is controlled by the optional T command microphone. When the command microphone is turned OFF, the transceiver will also be turned OFF automatically. OFF: he transceivers power is not controlled by the optional T command microphone. Even if the command microphone is turned OFF, the transceiver will continue to work.
--Set Mode-Radio Power ON OFF

DRadio power

(Appears when a scrambler unit is installed) When an optional scrambler unit is installed, the scrambler code can be set depending on how it is set by the dealer. When the UT-112 is installed, 32 codes (1 to 32) can be selected. When the UT-98 is installed, 128 codes (0 to 127) can be selected.
(When UT-112 is installed)
--Set Mode-Scrambler Code 1 <ENT OK>

D crambler code S

(When UT-98 is installed)
--Set Mode-Scrambler Code 0 <ENT OK>

Default: 1

Default: 0

q w e r t

CONNECTIONS AND MAINTENANCE
eEXTERNAL SPEAKER LEAD (Yellow) Connects to an external speaker.
Outer conductor : Speaker () Inner conductor : Speaker (+)

Connections

rHAILER/FOGHORN () LEAD (Black) Connects to a hailer speaker (25 W nominal at 13.8 V/4 ). tHAILER/FOGHORN (+) LEAD (Blue) Connects to a hailer speaker (25 W nominal at 13.8 V/4 ).

HM-162

HM-157
The optional HM-157 can be connected to the transceiver directly, as well as via the supplied connection cable for longer distance remote operation. The connector of the connection cable can be installed into a cabinet, wall, etc., as a built-in plug.
he optional HM-162 should be installed to the transceiver using T the supplied connection cable.
For longer distance remote operation, the optional extension cable, OPC-1541/OPC-999* (6m; 20ft/connecting between transceiver and the connection cable), is available, and up to two OPC-1541/OPC-999* can be added. * PC-1541: For the HM-162 O OPC-999 : For the HM-157 o not connect the HM-162 to the OPC-999, and the D HM-157 to the OPC-1541. 63

HM-157

Mounting base Nut
q nsert the supplied cable into the external microphone I jack and tighten the cable nut as shown below.
Gasket Screw holes (approx. 2 (d) mm; 332) Cap
y he completed installation should look like this. T HM-162 HM-157 w o use the supplied cable as a wall socket, perform the T following steps. e sing the mounting base as a template, carefully mark the U holes where the cable and three screws will be fastened. r Drill holes at these marks. t nstall the mounting base using the supplied screws as I shown below. HM-162
Gasket Screw holes (approx. 2 (d) mm; 332)

29.5 to 31.5 (1532 to

28 (d) mm;

50 (d) mm;

DHM-162

Mounting base

Nut Gasket Cap

DHM-157

Mounting base 2 mm; mm; 316

50 (d) mm; 13132

24 to 27 (d) mm (1516 to 1116)

23 (d) mm; 2932

TROUBLESHOOTING
PROBLEM POSSIBLE CAUSE SOLUTION Check the connection to the transceiver. Set [SQL] to the threshold point. Set [VOL] to a suitable level. Drain water from the speaker. The transceiver does Bad connection to the power supply. not turn ON. No sound from speaker. Squelch level is too high. Volume level is too low. Speaker has been exposed to water. Sensitivity is low. he Attenuator is activated. T

REF. p. 58 p. 8 p. 8

ush [LO/DXICSCRM] to turn the function p. 8 P OFF. pgs. 6, 7, 70 p. 8 p. 13 p. 56 p. 8 p. 15
Transmitting is impossi- ome channels are programmed for low Change channels. S ble, or high power can power or receive only in regulations. not be selected. The output power is set to low. ush [H/L] to select high power. P Scan does not start. No beeps. Distress call cannot be transmitted. TAG channel is not programmed. Beep tones are turned OFF. The squelch is open. et the desired channels as TAG channels. S urn the beep tone ON in Set mode. T Set [SQL] to the threshold point.

U.S.A., International and Canadian channels are available.
o SQUELCH CONTROL [SQL] Rotate to set the squelch threshold level. (p. 8) !0 SCAN/TAG KEY [SCANTAG] (p. 13) Push to start and stop Normal or Priority scan. Push and hold for 1 sec. to set or clear the displayed channel as a TAG (scanned) channel. While pushing and holding [H/L], push for 3 sec. to clear or set all TAG channels in the selected channel group. !1 VOLUME CONTROL [VOL] (p. 8) Rotate to adjust the audio level. !2 TRANSMIT POWER KEY [H/L] Push to toggle the power high or low. (p. 8)
Some channels are set to low power only.
While pushing this key, some keys perform secondary functions. !3 POWER KEY [POWER] (p. 8) Push to turn power ON. Push and hold for 1 sec. to turn power OFF.

Function display

q w e r t !5 !4 !3 !2 !1 !0 y y CALL CHANNEL INDICATOR (pgs. 6, 9) Appears when the call channel is selected. u i u LOW BATTERY INDICATOR Blinks when the battery voltage drops to approx. 10 V DC or below. i CHANNEL NUMBER READOUT Indicates the selected operating channel number. o CHANNEL COMMENT INDICATOR Channel comment appears if programmed. (p. 10)
BUSY 25W INT LOC RX DUP SCRAM TAG NORMAL SCAN -3434.506N 12323.236W Local 1:10

CALLING

q RX SPEAKER INDICATOR (p. 51) Appears during the RX Speaker mode. w POWER INDICATOR (p. 8) 25W appears when high power is selected. 1W appears when low power is selected. e TAG CHANNEL INDICATOR (p. 13) Appears when a TAG channel is selected. r DUPLEX INDICATOR (p. 7) Appears when a duplex channel is selected. t CHANNEL GROUP INDICATOR (p. 7) Indicates whether an U.S.A. USA, International INT, Canadian CAN or weather WX channel is in use.
!0 TIME ZONE INDICATOR Shows the current time data when a GPS receiver is connected.
?? may blink every 2 sec. instead of current time data when the GPS current time data is invalid. ?? may blink every 2 sec. instead of current time data 4 hours after the time data is input manually, up until 23.5 hours have past.
Local appears when the offset time data is set. (p. 47) No Time appears when no GPS receiver is connected and no time data is input manually.

Microphone

!1 POSITION INDICATOR Shows the GPS position data.
?? may blink every 2 sec. instead of position data when the GPS position data is invalid. In such a case, the last position data is held for up to 23.5 hours. ?? may blink every 2 sec. instead of position data 4 hours after the position data is input manually, up until 23.5 hours have past.

Microphone

No Position appears when no GPS receiver is connected and no position data is input manually. !2 SCAN INDICATOR PRI-SCAN 16 appears during Priority scan; NORMAL SCAN appears during Normal scan. (p. 13) DUAL 16 appears during Dualwatch; TRI 16 appears during Tri-watch. (p. 14) !3 SCRAMBLER INDICATOR (p. 11) Appears when the voice scrambler function is activated. (only when the optional scrambler unit is installed.) !4 LOCAL INDICATOR (p. 8) Appears when the Attenuator function is turned ON. !5 BUSY/TRANSMIT INDICATOR (p. 8) BUSY appears when receiving a signal or when the squelch opens. TX appears while transmitting.
q PTT SWITCH [PTT] Push and hold to transmit; release to receive. (p. 8) w CHANNEL UP/DOWN KEYS [Y]/[Z] Push either key to change the operating memory channel, Set mode settings, etc. (pgs. 6, 7, 55) Checks TAG channels, changes scanning direction or resumes the scan manually during scan. (p. 13) e TRANSMIT POWER KEY [HI/LO] Toggles power high and low when pushed. (p. 8)
While pushing and holding [HI/LO], turn power ON to toggle the Microphone Lock function ON and OFF. (p. 10) 5

BASIC OPERATION

Channel selection

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 Dualwatch and Tri-watch. While standing by, you must monitor Channel 16. Push [169] momentarily to select Channel 16. Push [CH/WXDUALU/I/C] to return to the condition before selecting Channel 16, or rotate [DIAL] to select an operating channel.

25W TAG INT

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. 9) and are used to store your most often used channel in each channel group for quick recall. Push [169] 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. 9)

Simplex channels, 3, 21, 23, 61, 64, 81, 82 and 83 CANNOT be lawfully used by the general public in U.S.A. waters. IMPORTANT: To maximize the readability of your transmitted 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.

q y ui Microphone

t Push [LO/DXICSCRM] to turn the receive Attenuator function ON or OFF, if necessary.
LOC appears when the receive Attenuator function is in use.
y Push [H/L] to select the output power if necessary.
25W or 1W appears when high or low power is selected, respectively. Choose low power for short range communications, choose high power for longer distance communications. Some channels are for low power only.
u Push and hold [PTT] to transmit, then speak into the microphone.
TX appears. Channel 70 cannot be used for transmission other than DSC.
i Release [PTT] to receive. 8

Call channel programming

Call channel is used to select Channel 9 (default); however, you can program the call channel with your most often-used channels in each channel group for quick recall. q While pushing and holding [H/L], push [CH/WXDUAL U/I/C] one or more times to select the desired channel group (U.S.A., International or Canada) to be programmed. w Push [169] for 1 sec. to select the call channel of the selected channel group.
CALL and call channel number appear.
r Rotate [DIAL] to select the desired channel.

INT DUP DU

INTL CALL
34 34.506N 3434.506N 123 23.236W 12323.236W UTC 12:00 12:00
t Push [169] to program the displayed channel as the call channel.
Push [CLR] to cancel. The channel number stops blinking.

INT DUP

25W TAG
34 34.506N 3434.506N 123 23.236W 12323.236W UTC 12:00 12:00 25W TAG 3434.506N 34 34.506N 12323.236W 123 23.236W UTC 12:00 12:00

CALLING INT CALL

e Push [169] again for 3 sec. (until a long beep changes to 2 short beeps) to enter call channel programming.
Channel number starts blinking.

Channel comments

Memory channels can be labelled with a unique alphanumeric ID of up to 10 characters. Capital letters, small letters, 0 to 9, some symbols (. /) and space can be used. q Select the desired channel.
Cancel Dualwatch, Tri-watch or Scan in advance.

Microphone Lock function

The Microphone Lock function electrically locks [Y]/[Z] and [HI/LO] keys on the supplied microphone. This prevents accidental channel changes and function access. While pushing and holding [HI/LO] on the microphone, turn power ON to toggle the Lock function ON and OFF.
w While pushing and holding [H/L], push [169] to edit the channel comment. 25W INT
A cursor and the first character start blinking alternately. [Y]/[Z]
3434.506N 34 34.506N 12323.236W 123 23.236W UTC 12:00PLEASURE__ 12:00PLEASURE__

e Select the desired character by rotating [DIAL].

[HI/LO]

Push [169] or [CH/WX DUALU/I/C] to move the cursor forward or backward, respectively.
r Repeat step e to input all characters. t Push [DIALENTER] to input and set the comment.
Push [CLR] to cancel. The cursor and the character stop blinking.

Display backlight

The function display and keys can be backlit for better visibility under low light conditions. While pushing and holding [H/L], rotate [DIAL] to adjust the brightness of the LCD and key backlight.
The backlight is adjustable in 7 levels and OFF.
y Repeat steps q to t to program other channel comments, if desired.
Optional voice scrambler operation
D Activating the scrambler
The optional voice scrambler provides private communications. In order to receive or send scrambled transmissions you must rst activate the scrambler function. To activate the function, an optional scrambler unit is necessary. See pgs. 57, 62 for setting the scrambler unit. Ask your dealer for details. The scrambler function automatically turns OFF when Channel 16 or 70 is selected. q Rotate [DIAL] to select an operating channel other than Channel 16 and 70. w While pushing and holding [H/L], push [LO/DXICSCRM] to turn the optional scrambler function ON. SCRAM appears. e To turn the scrambler function OFF, repeat step w. SCRAM disappears. [Example]: Programming scrambler code 5.
--Set Mode-Scan Type Scan Timer WX Alert Dual/Tri Beep Contrast Foghorn Frequency
D Programming scrambler codes
There are 32 codes (1 to 32) or 128 codes (0 to 127)* available for programming when an optional scrambler unit is installed. In order to understand one another, all transceivers in your group must have the same scramble code. This function may not be available depending on dealer setting.
*Depends on the installed scrambler unit.
q Turn power OFF. w While pushing [169], turn power ON to enter set mode. e After the display appears, release [169]. r Rotate [DIAL] to select the Scrambler Code, push [DIALENTER]. t Rotate [DIAL] to select the desired scrambler code. y Push [DIALENTER] to set and exit the scrambler code item. u Push [CLR], or rotate [DIAL] to select Exit, push [DIALENTER] to exit set mode.

Rotate

to enter set mode.
to select item, then push.
--Set Mode-Dual/Tri Beep Contrast Foghorn Frequency Radio Power Scrambler Type Scrambler Code

Select

to select code, then push.
--Set Mode-Scrambler Code 5 Select <ENTOK>

SCAN OPERATION

Scan types
Scanning is an efcient way to locate signals quickly over a wide frequency range. The transceiver has Priority scan and Normal scan. When the Weather Alert function is turned ON, the previously selected (last used) weather channel is also checked while scanning. (p. 56) PRIORITY SCAN

CH 01 CH 02

Set the TAG channels (scanned channel) before scanning. Clear the TAG channels which inconveniently stop scanning, such as those for digital communication use. (Refer to right page for details.) Choose Priority or Normal scan in Set mode. (p. 55)

NORMAL SCAN

Priority scan searches through all TAG channels in sequence while monitoring Channel 16. When a signal is detected on Channel 16, scan pauses until the signal disappears; when a signal is detected on a channel other than Channel 16, scan becomes Dualwatch until the signal disappears. 12
Normal scan, like Priority scan, searches through all TAG channels in sequence. However, unlike Priority scan, Channel 16 is not checked unless Channel 16 is set as a TAG channel.

Setting TAG channels

For more efcient scanning, add the desired channels as TAG channels or clear the TAG for unwanted channels. Channels that are not tagged will be skipped during scanning. TAG channels can be assigned to each channel group (USA, INT, CAN) independently. q While pushing and holding [H/L], push [CH/WXDUALU/I/C] to select the desired channel group (USA, INT or CAN.) w Select the desired channel to be set as a TAG channel. e Push [SCANTAG] for 1 sec. to set the displayed channel as a TAG channel.
TAG appears in the display.

Starting a scan

Set scan type (Priority or Normal scan) and scan resume timer in advance, using Set mode. (p. 55) q While pushing and holding [H/L], push [CH/WXDUAL U/I/C] to select the desired channel group (USA, INT, CAN) if desired. w Set TAG channels as described at left. e Make sure the squelch is closed to start a scan. r Push [SCANTAG] to start Priority or Normal scan.
r To cancel the TAG channel setting, repeat step e.

TAG disappears.

Clearing (or setting) all tagged channels While pushing and holding [H/L], push [SCANTAG] for 3 sec. (until a long beep changes to 2 short beeps) to clear all TAG channels setting in the channel group.

Repeat above procedure to set all TAG channels.
PRI-SCAN 16 appears at the channel comment indicator during Priority scan. NORMAL SCAN appears at the channel comment indicator during Normal scan. When a signal is detected, scan pauses until the signal disappears or resumes after pausing 5 sec. according to Set mode setting. (Channel 16 is still monitored during Priority scan.) Rotate [DIAL] to check the scanning TAG channels, to change the scanning direction or resume the scan manually. A beep tone sounds and 16 blinks at the channel comment indicator when a signal is received on Channel 16 during Priority scan.
[Example]: Starting a normal scan.

Scan starts.

INT DUP TAG NORMAL SCAN 3434.506N 34 34.506N 12323.236W 123 23.236W UTC 12:00 12:00 25W
When a signal is received

BUSY 25W INT DUP

NORMAL SCAN 3434.506N 34 34.506N 12323.236W 123 23.236W UTC 12:00 12:00

SAFETY

DUALWATCH/TRI-WATCH

Operation

q Select Dualwatch or Tri-watch in Set mode. (p. 56) w Rotate [DIAL] to select the desired operating channel. e Push [CH/WXDUALU/I/C] for 1 sec. to start Dualwatch or Tri-watch.
DUAL 16 appears during Dualwatch; TRI 16 appears during Tri-watch. A beep tone sounds when a signal is received on Channel 16.

Description

Dualwatch monitors Channel 16 while you are receiving on another channel; Tri-watch monitors Channel 16 and the call channel while receiving another channel. Dualwatch/Triwatch is convenient for monitoring Channel 16 when you are operating on another channel. DUALWATCH/TRI-WATCH SIMULATION Call channel
r To cancel Dualwatch/Tri-watch, push [CH/WXDUALU/I/C] again. [Example]: Operating Tri-watch on INT Channel 25

Tri-watch starts.

Signal is received on call channel.
BUSY 25W TAG TRI 34.506N 3434.506N 12323.236W 123 23.236W UTC 12:00 12:00 INT CALL

TRI 16

Dualwatch

Tri-watch

34 34.506N 3434.506N 12323.236W 123 23.236W UTC 12:00 TELEPHONE 12:00
If a signal is received on Channel 16, Dualwatch/Tri-watch pauses on Channel 16 until the signal disappears. If a signal is received on the call channel during Tri-watch, Tri-watch becomes Dualwatch until the signal disappears. To transmit on the selected channel during Dualwatch/Triwatch, push and hold [PTT].
Tri-watch resumes after the signal disappears.
Signal received on Channel 16 takes priority.
TRI 16 3434.506N 34 34.506N 12323.236W 123 23.236W UTC 12:00 TELEPHONE 12:00

DSC OPERATION

MMSI code programming
The 9-digit MMSI (Maritime Mobile Service Identity: DSC self ID) code can be programmed at power ON. This code programming can be performed only twice. q Turn power OFF. w While pushing [MENU], turn power ON to enter MMSI code programming condition. e After the display appears, release [MENU]. r Push [MENU] again to enter the DSC menu. t Rotate [DIAL] to select Set up, push [DIALENTER].

<CLR 1sec Null Data> 1secNull <CLRExit / ENT OK> Exit ENTOK>
t Push [CLR] or rotate [DIAL] to select Exit, push [DIALENTER].
Manually programmed position data will be held for 23.5 hours only. 21
Position and time indication
When a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is connected, the transceiver displays the current position and time. When no GPS receiver is connected, the transceiver displays the manually entered position and time. A GPS receiver appropriate for the IC-M504 is not supplied by Icom. A GPS receiver with NMEA0183 ver. 2.0 or 3.01 format is required for position and time indication. Ask your dealer about suitable GPS receivers.
25W TAG 3434.506N 12323.236W UTC 12:00 INT
GPS information indication
When a GPS receiver (NMEA0183 ver. 2.0 or 3.01) is connected, the transceiver displays the GPS information after pushing and holding [DIALENTER] for 1 sec.

--GPS Info--

for 1 sec.

DATE UTC POS

: JAN/16/2006 : 12:00 : 3434.506N 12323.236W COURSE: 261M SPEED : 18.5kt
When connecting GPS receiver is compatible with several sentence formatters, the order of input precedence is RMC, GGA, GNS, GLL and VTG.
When the connecting GPS receiver is compatible with several sentence formatters, the order of input precedence is RMC, GGA, GNS and GLL. When sentence formatter RMC is received, time indication includes a date. Thus, the UTC or Local indication is not displayed. ?? may blink instead of position and time indications when the GPS data is invalid, or has not been manually updated after 4 hours. 22

Distress call

A distress call should be transmitted, if in the opinion of the Master, the ship or a person is in distress and requires immediate assistance. e After transmitting the distress call, the transceiver waits for an acknowledgment call on Channel 70.
The distress call is automatically transmitted every 3.5 to 4.5 minutes. After 2 sec., the transceiver is set to Channel 16 automatically.
Distress Call TX Complete Now Waiting for ACK
NEVER USE THE DISTRESS CALL WHEN YOUR SHIP OR A PERSON IS NOT IN AN EMERGENCY. A DISTRESS CALL CAN BE USED ONLY WHEN IMMEDIATE HELP IS NEEDED.
q Conrm no distress call is being received. w While lifting up the key cover, push [DISTRESS] for 5 sec. to transmit the distress call.
Emergency channel (Channel 70) is automatically selected and the distress call is transmitted. When no GPS is connected, input your position and UTC time, if possible. While pushing [DISTRESS], the key backlighting blinks.

Received DistressRLY appears in the display, then Channel 16 is automatically selected.
D Receiving a distress acknowledgement
While monitoring Channel 70 and a distress acknowledgement to other ship is received: The emergency alarm sounds for 2 minutes.
TAG Received DistressRLY <John <CLR Beep Off>
Received DistressACK appears in the display, then Channel 16 is automatically selected.
DSC OPERATION 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. Received Group appears in the display. Push [CLR] to stop the beep, then push [DIALENTER] to select the channel specied by the calling station for voice communication; push [CLR] to ignore the group call.
25W TAG Received Group <Icom <CLR Beep Off> INT
D Receiving an individual call
While monitoring Channel 70 and an individual call is received: The emergency alarm or beeps sound depending on the received category. Received Individual appears in the display. Push [CLR] to stop the beep, then push [DIALENTER] to reply the call and select the channel specied by the calling station for voice communication (depending on your replying condition see p. 28 for individual acknowledgement call procedure for details.); push [CLR] to ignore the individual call.
25W TAG Received Individual <Paul <CLR Beep Off> INT
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 Distress or Urgency; beeps sound for 2 minutes. Received All Ships appears in the display. Push [CLR] to stop the beep, then push [DIALENTER] to monitor channel 16 for an announcement from the calling vessel; push [CLR] to ignore the call.
DSC OPERATION D Receiving a position request call
25W TAG Received All Ships <Paul <CLR Beep Off>
While monitoring Channel 70 and a position request call is received: Received POS Request appears in the display. Push [CLR] to stop the beep, then push [DIALENTER] to reply to the position request call; push [CLR] to ignore the position request call.
D Receiving a geographical area call
While monitoring Channel 70 and a geographical area call (for the area you are in) is received: Emergency alarm or beeps sound depending on the received category. Received Geographic appears in the display.
25W TAG Received Geographic <Osaka Bay <CLR Beep Off> INT

[169] and [DISTRESS] keys are also available.
w Push and hold [LO/DXICSCRM] for 1 sec. again to call up the optional command microphone side.
The transceiver and the optional command microphone emit call beeps.

RX Speaker function

While in the Intercom mode, the transceiver functions (transmit and receive) are interrupted. If the transceiver is in transmit condition, the Intercom function is not available. When a DSC call is received, the intercom function is interrupted with an automatic return to the transceiver mode. The transceivers display indicates Receiving DSC calls. (p. 41) When a WX alert is received, WX ALERT blinks and a beep sounds. The WX alert sounds after the Intercom use is nished. The IC-M504 has an RX Speaker function. When this function is turned ON, the received audio can be heard on the deck or tower via an external speaker or hailer speaker. Connect an external speaker or hailer speaker as described on p. 58. q Push and hold [HAILRX Speaker mode. ] for 1 sec. to enter the RX
RX appears Rotate [DIAL] to adjust the audio output level, push [DIALENTER].
25W INT RX TAG RX 15 <ENTOK> CALLING

Push and hold for 1 sec.

w To return to normal operation, push and hold [HAILRX for 1 sec.
While in the RX Speaker mode, rotate [DIAL] while pushing and holding [HAILRX ] to adjust the audio output level. After adjusting, push [DIALENTER].
Rotate [DIAL] within 1 sec. after pushing [HAILRX wise the transceiver returns to the normal operation. ]. Other-

Hailer operation

The IC-M504 has a hailer function for voice amplication over a loudspeaker, making it unnecessary to leave the bridge to talk a hailing party. Connect an external hailer speaker (25 W nominal at 13.8 V/4 ) as described on p. 58.
Transmitting is not possible during hailer operation. The received signal is muted during hailer operation.
While in the hailer mode, the transceiver functions (transmit and receive) are interrupted. If the transceiver is in transmit condition, the hailer function is not available. When a DSC call is received, the hailer function is interrupted with an automatic return to the transceiver mode. The transceivers display indicates Receiving DSC calls. (p. 41)

q Push [HAILRX

] to enter hailer mode.

HAILER 15

w Push and hold [PTT] and speak at a normal voice level into the microphone.

TALK appears. WAIT appears at the channel comment indicator when the optional command microphone is in use. To adjust the hailer level, rotate [DIAL].
e To return to normal operation, push [CLR] or [HAILRX
Automatic foghorn function
The automatic foghorn function sounds a horn repeatedly until the function is turned OFF. Four patterns are available for varying conditions. The foghorn outputs from the hailer speaker. To use this function, the hailer speaker must be connected to the transceiver. See p. 58 for connection details.

UNDERWAY

PATTERN
Motor vessel underway and making way.
One 5-second blasts every 120 seconds.
Two 5-second blasts (separated by 2 seconds) every 120 seconds.

2s 120s

Motor vessel underway but stopped (not making way). Sailing vessel underway, fishing vessel (underway or anchored), vessel not under command, a vessel restricted in her ability to maneuver (underway or at anchor), or a vessel towing or pushing another ahead.
One 5-second blast followed by 5s1 1s two 1-second blasts (each separated by 2 seconds) every 120 2s seconds. One 5-second blast followed by three 1-second blasts (each separated by 2-seconds) every 120 seconds.

5s1 1s

Vessel under tow (manned).
The audio frequency of the foghorn is selectable. See p. 57 for details on selecting the audio frequency. 53
] to r To return to normal operation, repeat step q. When a DSC call is received, the automatic foghorn function is interrupted with an automatic return to the transceiver mode. The transceivers display indicates Receiving DSC calls. (p. 41)
q While pushing and holding [H/L], push [HAILRX enter auto foghorn mode.

UNDERWAY STOP

<ENTOK>
w Rotate [DIAL] to select the desired foghorn pattern, push [DIALENTER].
UNDERWAY, STOP, SAIL, TOW are available. (p. 53) Even if [DIALENTER] hasnt been pushed, the display automatically changes to the next step after 5 sec. of inactivity.
e Rotate [DIAL] to adjust the foghorn level, push [DIALENTER].
The foghorn level is adjustable in 30 steps. Even if [ENT] hasnt been pushed, the display automatically changes to the next step after 5 sec. of inactivity. Rotate
25W TAG FOGHORN 15 <ENTOK> CALLING 25W TAG FOGHORN 15 INT INT
The selected foghorn pattern is displayed.

SET MODE

Set mode programming
Set mode is used to change the conditions of the transceivers functions: Scan type, Scan resume timer, Weather alert, Dual/Tri-watch, Beep tone, LCD contrast, Automatic foghorn frequency, Radio power, Scrambler type* and Scrambler code.*

*Appears only when the optional scrambler unit is installed.

Set mode items

D Scan type
The transceiver has 2 scan types: Normal scan and Priority scan. Normal scan searches all TAG channels in the selected channel group. Priority scan searches all TAG channels in sequence while monitoring Channel 16.
--Set Mode-Scan Type Priority Normal
Available functions may differ depending on how they are set by the dealer. q Turn power OFF. w While pushing and holding [169], turn power ON to enter Set mode. e After the display appears, release [169]. r Rotate [DIAL] to select the desired item, push [DIALENTER]. t Rotate [DIAL] to select the desired condition of the item. y Push [CLR], or rotate [DIAL] to select Exit, then push [DIALENTER] to exit set mode and returns to normal operation condition. SET MODE CONSTRUCTION
--Set Mode-Scan Type Scan Timer WX Alert Dual/Tri Beep Contrast Foghorn Frequency Radio Power Scrambler Type Scrambler Code Exit

Default: Normal

D Scan resume timer
The scan resume timer can be selected as a pause (OFF) or timer scan (ON). When OFF is selected, the scan pauses until the signal disappears. When ON is selected, the scan pauses 5 sec. and resumes even if a signal has been received on any other channel than Channel 16.
--Set Mode-Scan Timer ON OFF

Default: OFF

.D Beep tone You can select the silent operation by turning beep tones OFF or you can have conrmation beeps sound at the push of a key by turning beep tones ON.

--Set Mode-Beep ON OFF

D Weather alert
A NOAA broadcast station transmits a weather alert tone before important weather information. When ON is selected, the previously selected (used) weather channel is checked any time during standby or while scanning. When ON with WX SCAN is selected, the weather channels are checked in sequence during standby or while scanning. The WX ALERT indicator blinks until the transceiver is operated after the transceiver detects the alert.
WX ALERT appears instead of WX indication when the function is set ON.
--Set Mode-WX Alert ON ON with WX SCAN OFF <ENTOK>

Default: ON

D LCD contrast
The LCD contrast can be adjustable to 8 levels. The level 1 is the lowest contrast, and the level 8 is the highest contrast.

--Set Mode-Contrast 1 <ENTOK>

D Dual/Tri-watch

This item can be selected as Dualwatch or Tri-watch. (p. 14)
--Set Mode-Dual/Tri Tri-watch Dualwatch

Default: 5

Default: Dualwatch
SET MODE D Automatic foghorn frequency
The audio frequency of the automatic foghorn can be adjusted to suit your preference. While this item is selected, pushing [PTT] outputs the foghorn experiment with the frequencies available until you nd one you like.
Available frequency range is 200 Hz to 850Hz in 50 Hz steps.
--Set Mode-Foghorn Frequency 200 <ENTOK>

D Scrambler type

(Appears when a scrambler unit is installed) When an optional scrambler unit is installed, the scrambler type can be selected in set mode depending on how it is set by the dealer.
--Set Mode-Scrambler Type UT-98 UT-112

Default: UT-112

Default: 400

D Radio power

This item sets the Radio Power function ON or OFF. ON : The transceivers power is controlled by the optional command microphone. When the command microphone is turned OFF, the transceiver will also be turned OFF automatically. OFF : The transceivers power is not controlled by the optional command microphone. Even if the command microphone is turned OFF, the transceiver will continue to work.
--Set Mode-Radio Power ON OFF

D Scrambler code

(Appears when a scrambler unit is installed) When an optional scrambler unit is installed, the scrambler code can be set depending on how it is set by the dealer. When the UT-112 is installed, 32 codes (1 to 32) can be selected. When the UT-98 is installed, 128 codes (0 to 127) can be selected.
(When UT-112 is installed)
--Set Mode-Scrambler Code 1 <ENTOK>
(When UT-98 is installed)
--Set Mode-Scrambler Code 0 <ENTOK>

Default: 1

Default: 0

q w e r t

CONNECTIONS AND MAINTENANCE
e EXTERNAL SPEAKER LEAD (Yellow) Connects to an external speaker.

Connections

Ferrite core*
r HAILER/FOGHORN () LEAD (Black) Connects to a hailer speaker (25 W nominal at 13.8 V/4 ). t HAILER/FOGHORN (+) LEAD (Blue) Connects to a hailer speaker (25 W nominal at 13.8 V/4 ).

Do not loose! y

q NMEA IN LEAD (Red) Connects to a GPS receiver for position indication.
A NMEA0183 ver. 2.0 or 3.01 (sentence formatters RMC, GGA, GNS, GLL and VTG) compatible GPS receiver is required. Ask your dealer about suitable GPS receivers.

y ANTENNA CONNECTOR Connects a marine VHF antenna with a PL-259 connector to the transceiver. CAUTION: Transmitting without an antenna may damage the transceiver. u GROUND TERMINAL Connect this terminal to a vessel ground to prevent electrical shocks and interference from other equipment occurring. Use a self-tapping screw (mm.) i EXTERNAL MICROPHONE JACK Connects the optional command microphone.
w NMEA OUT LEAD (White) Connects to a PC or navigation equipment (NMEA0183 ver. 3.01 sentence formatters DSC, DSE compatible) for position data received from other ships.
o MICROPHONE CONNECTOR Connects the supplied microphone depending on version. Ask your dealer for details. !0 DC POWER CONNECTOR Connects the supplied DC power cable from this connector to an external 12 V battery.

Supplied accessories

CAUTION: After connecting the DC power cable, NMEA IN/OUT leads, external speaker lead and hailer/foghorn lead, cover the connector and leads with an adhesive tape as shown below, to prevent water seeping into the transceiver.
Rubber vulcanizing tape Microphone* Mounting bracket For mounting bracket Knob bolts Flat washers (M5) Screws (520) Spring washers (M5)
For microphone Mounting base* Connection cable* (OPC-1000: 6m; 20 ft)
* The supplied ferrite core must be attached to the NMEA in/out leads and DC power cables as illustrated at left. Fix the ferrite core near the transceiver with the two supplied ties to prevent it from moving.

Tapping screws* (M3 16)

Fuse replacement
One fuse is installed in the supplied DC power cable. If a fuse blows or the transceiver stops functioning, track down the source of the problem if possible, and replace the damaged fuse with a new one of the proper rating.
*Depending on version Microphone hanger and screws (316) DC power cable (OPC-891A) Warning sticker Ferrite core and ties

Fuse rating: 10 A

Antenna
A key element in the performance of any communication system is the antenna. Ask your dealer about antennas and the best place to mount them. 59

Mounting the transceiver

D Using the supplied mounting bracket