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2-1
2. DSC Terminal
Operational Overview
2.1 DSC Messages
The contents of a DSC message change with format specifier (call-
ing category).
1. Format: Calling type
IND: Individual Call
TEL: Telephone Call
ALL: All Ships Call
R/A: Relay All Ships Call
R/S: Relay Specific Ships Call
GRP: Group Call
POS: Position Request Call
2. Address: Station’s 9-digit ID number
IDs starting with “00” are coast stations, those starting with “0”
are group IDs or another IDs are ship’s IDs.
3. Category: Communication priority
There are four communication priorities as below:
DIS: A vessel is in grave and imminent danger and requests im-
mediate assistance.
URG: Announce important safety information or request medical
assistance.
SAF: Transmitting a message containing an important navigational
or an important meteorological warning.
ROU: For routine (individual) calling.
4. DSC: DSC channel
A DSC channel is different from the usual communication channel
because it is not used for voice communication but rather DSC and
acknowledging receipt of message.
5. Telecom1: Telecommand
The communication mode; simplex or semi-duplex.