JRC JSS-2150 Instruction Manual page 23

Type
Message code indicating the type of the call.
Codes are listed below.
・ Individual call...
・ Individual ACK... Acknowledgement
・ Individual NACK... Negative acknowledgement
・ Group call...
・ GEO area call...
・ All ships call...
・ Distress...
・ Distress ACK...
・ Distress relay...
・ Distress relay ACK... Acknowledgement
・ Distress relay GEO... Area call of distress
Individual call message
of
individual call message
of individual call message
Group call message
Area call message
Call to all ships
Distress call message
Acknowledgement of
distress call message
Distress relay message
of
distress relay message
relay message
Intent
Message code indicating specific content.
Indicates the type of the call for a specific
purpose, not for radiotelephone
communication.
・ Polling...
・ Position RQ...
・ Ship position...
・ Test...
Work FRQ
Message code indicating communication
frequency after a DSC call.
Polling
Ship position request
Ship position notification
Safety test call
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