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4-1
4. DSC DISTRESS OPERATIONS
Distress operation overview
1. Press the DISTRESS key.
2. Wait for the distress alert acknowledgement.
3. Communicate with the coast station.
4.1 How to Send Distress Alert
GMDSS ships carry a DSC terminal with which to transmit the distress alert in the
event of a life-endangering situation. A coast station receives the distress alert and
sends the distress alert acknowledge call to the ship in distress. Then, voice or telex
communication between the ship in distress and coast station begins. Transmission
of the distress alert and receiving of the distress alert acknowledgement are complete-
ly automatic - simply press the DISTRESS key to initiate the sequence.
There are three types of distress alerts; MULTI, SINGLE, AUTO. MULTI is used nor-
mally. To use another method, see step 10 in paragraph 4.1.2.
Note: After sending the distress alert, no control unit has priority.
4.1.1 How to send distress alert by DISTRESS key with distress in-
formation not edited
1. Open the DISTRESS key cover then press the DISTRESS key for four seconds.
The audio alarm sounds while pressing the key, and the key flashes in red. The
countdown message appears on the screen while pressing the DISTRESS key
(3S → 2S → 1S → 0S).
(3)
(2)
(1)
Ship in distress
(Your ship)
(1) Ship in distress sends Distress Alert.
(2) Coast station sends distress acknowledgement (DIST ACK).
(3) Voice or telex communication between ship in distress and coast station.
Coast
station
Countdown message
TX 2182 . 0 / RX 2182 . 00 kHz
MSG TYPE : D
I
STRESS ALERT
NATURE : UNDES
I
GNATED
LAT :
09
°
12.1234
’ N
LON/UTC :
123
°
45.1234
’ E / 12 : 34
COMM MODE
: TELEPHONE
DSC FREQ : MULTI 2 4 6 8 12 16MHz