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3. DSC OVERVIEW
3-2
Contents of a DSC call
Calling category
Call category Call
DISTRESS Distress Alerts, Distress relay area, Distress relay coast
GENERAL
Individual, PSTN message, Test message, Group message, Area
message, Position, Medical Transport, Nautical Craft, Polling message
Station ID
Own ship ID and sending station ID. Coast station ID begins with 00; Group ID
begins with 0.
Priority
Distress: Grave and imminent danger and request immediate assistance.
Urgency: A calling station has a very urgent call to transmit concerning safety of
ship, aircraft or other vehicle or safety of person.
Safety: A station is about to transmit a call containing an important
navigational or meteorological warning.
Routine: General calling
Communication type
Telephone: Telephone (J3E) by SSB radiotelephone
NBDP-ARQ: Telex (J2B) mode ARQ via NBDP Terminal Unit
NBDP-FEC: Telex (J2B) mode FEC via NBDP Terminal Unit
DATA: Data communication by SSB (Routine individual only)
Communication frequency
Working frequency used to call by telephone, NBDP or DATA. The sending station may
have the receiving frequency (ship or coast station) assign the frequency to use.
Position
Position can be automatically or manually sent.
DSC frequency
DSC frequency to use. If the call priority is SAFETY, URGENCY and DISTRESS,
choose a DSC distress frequency.
End code
The end of a DSC call is denoted by RQ (Acknowledgement required), BQ
(Acknowledgement) or EOS (no acknowledgement required).