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4. DSC DISTRESS OPERATIONS
4-9
• Relay the distress alert in the following cases:
• You have not received a distress acknowledge call from a coast station within five
minutes after receiving a distress call.
• You have not received a distress relay from other ship.
• You cannot receive distress communications from other ship over radiotele-
phone.
• The ship relaying the distress alert should establish communications with the sta-
tion controlling the distress as directed and render such assistance as required
and appropriate.
• If it is clear the ship or persons in distress are not near your ship and/or other ves-
sels are better placed to assist, superfluous communications which could interfere
with search and rescue activities should be avoided. Details should be recorded in
the log.
• When the received distress frequency is different from the current communication
frequency, do the following:
1. Rotate the ENTER knob to select [CHANGE] then push the knob.
2. Rotate the ENTER knob to select the frequency same as the received distress
one then push the knob.
Action for ship receiving distress alert on HF band
No
Yes
Yes
Yes
No
No
DSC distress alert received.
Press the CANCEL key
to silence alarm.
Listen to associated RTF* or
NBDP channel(s) for 5 minutes.
Is the alert
acknowledged or
relayed by CS and/
or RCC?
HF DSC, RTF AND NBDP CHANNELS (kHz)
* = Radiotelephone
DSC RTF* NBDP
4207.5
6312.0
8414.5
12577.0
16804.5
4125
6215
8291
12290
16420
4177.5
6268
8376.5
12520
16695
Is distress
communication in
progress on
associated RTF*
channels?
Transmit distress
relay on HF to CS
and inform RCC.
Is your ship
able to
assist?
Contact RCC via most
efficient medium to
offer assistance.
CS = Coast Station
RCC = Rescue Coordination Center
Enter details in log.