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3. DIGITAL SELECTIVE CALLING
3-2
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” ap-
pears.
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 FM-
4721 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 sec-
onds). 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 watch-
es 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.
4. If no acknowledgment is received, the distress alert is
repeated in 3.5 - 4.5-minute intervals, until a DSC ac-
knowledgment is received.
Note: To turn off the distress alarm until the radio re-
transmits the distress call, press the 16/9 key.
Waiting for ACK
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