3. DIGITAL SELECTIVE CALLING
3-3
5.
When you receive the DSC distress acknowledgment,
a distress alarm sounds and CH16 is automatically se-
lected. The display shows the MMSI of the ship re-
sponding to your distress and the applicable
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 acknowl-
edging 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, Capsiz-
ing, 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 dis-
tress 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 sec-
onds). The unit beeps and the display counts down the
time remaining until the distress alert is sent. The back-
light of the display and numeric keys flash while the dis-
play 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 dis-
play shows "Waiting for ACK" while the equipment
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 se-
lected. The display shows the MMSI of the ship re-
sponding to your distress and the applicable
acknowledgement message.
"Received DISTRESS ACK": Acknowledgment signal
is received.
Received DISTRESS ACK
Acknowledged
Waiting for ACK
Received DISTRESS ACK
Acknowledged
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