3 DSC OVERVIEW
3-2
Contents of a non-distress, safety 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 call containing an important
navigational or meteorological warning.
Urgency: A calling station has a very urgent call 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 radiotelephone
NBDP-ARQ: Telex (J2B) mode ARQ via NBDP Terminal Unit
NBDP-FEC: Telex (J2B) mode FEC via NBDP Terminal Unit
• Communication frequency
Working frequency used to call by telephone or NBDP. The sending station may have
the receiving frequency (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 call category is SAFETY, URGENCY or DISTRESS,
choose a DSC distress frequency.
• End code
The end of a DSC call is denoted by ACK RQ (Acknowledge Request), ACK BQ
(Acknowledge Back) or EOS (End of Sequence).
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