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CHAPTER6. DIGITAL SELECTIVE CALLING(DSC)
6-1
OVERVIEW
1)
DSC is abbreviation for Digital Selective Calling.
2) DSC uses MF / HF bands to send digital disaster and general calls to ships, configure
and send station responses.
3) There are 16 call frequencies, using for the DSC distress, safety and urgency of the MF /
HF bands: 2187.5 / 4207.5 / 6312.0 / 8414.5 / 12577.0 / 16804.5 Khz.
4) Reception of a normal DSC call is possible in DSC mode.
5) Distress, safety, urgency DSC calls are received by the W / K receiver.
6-2
DSC MESSAGE
1) DSC messages are divided into two major types.
- DISTRESS message
DISTRESS ALERT / DISTRESS RELAY AREA / DISTRESS RELAY INDIVIDUAL
-General messages (Safety, urgency, routine)
INDIVIDUAL / GROUP / TEST / POSITION / AREA / POLLING
Call
Explanation
DISTRESS ALERT
DISTRESS message
DISTRESS RELAY
AREA
Deliver the received DISTRESS message to all vessels in
specific area
DISTRESS RELAY
INDIVIDUAL
Deliver the received DISTRESS message to all specific
vessels
INDIVIDUAL
Call to a specific address
GROUP
Call to a specific GROUP
TEST
Send a test signal to a vessel
POSITION
Require the location of another vessel
AREA
Call all ships in a specific area
MEDICAL/NEUTRAL OPTION functions
POLLING
Confirm that other vessels can communicate (only
reception is possible)
