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Contents of a DSC call
Calling category
Call category Call
Individual Individual, PSTN, Test, Position, Polling, Relay Sel (specific coast station)
All Ships All Ships, Neutral, Medical, Relay All
Group Group
Geographical Area Area
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.
Safety:
A station is about to transmit a message containing an important navigational or
meteorological warning.
Urgency
: A calling station has a very urgent message to transmit concerning safety of
ship, aircraft or other vehicle or safety of person.
Business:
Communication related to the navigation, movements and needs of ships and
aircraft.
Routine:
General calling
Communication type
Telephone: telephone (J3E) by SSB
NBDP-ARQ: Telex (J2B) mode ARQ via NBDP Terminal
NBDP-FEC: Telex (J2B) mode FEC via NBDP Terminal
Communication frequency
Working frequency used to call by telephone or NBDP. The sending station may have the
receiving station (ship or coast station) assign the frequency to use.
Position
Position can be automatically or manually input.
DSC frequency
DSC frequency to use. If the order of communications priority is SAFETY, URGENCY and
DISTRESS, select a DSC distress frequency.
End code
The end of a DSC message is denoted by ACK RQ (Acknowledge Request), ACK BQ
(Acknowledge Back) or EOS (End of Sequence).