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・ No reason… No reason
・ Congestion… Maritime information
exchange center
congested
・ Busy… Busy
・ Queue… Queued
・ Barred… Station barred
・ No operator… No operator
・ Temp no oper…
Temporarily no operator
・ EQP disabled… Equipment disabled
・ Unable FRQ… Indicated frequency
cannot be used
・ Unable mode…
Indicated mode cannot
be used
Rx FRQ
Received frequency of the call
Subject/ Sub
Message code clarifying communication
contents when sending an urgency call to all
ships.
When sailing in dangerous waters, such as
in areas of political instability, these call
messages are used with the following
information.
・ Neutral ship: In accordance with ITU
resolution 18 (Mob-83), inform all ships
that own ship is of neutral nationality.
・ Medical TRANSP: Inform all ships
that own ship is performing medical
transportation, and is protected under the
1949 Geneva Convention.
Topic
Message codes in an acknowledged message
After sending an individual call, "Unable to
comply" is received when the responding
station cannot comply.
Type
Message code indicating the type of the call.
Codes are listed below.
・ Individual call… Individual call message
・ Individual ACK… Acknowledgement of
individual call message
・
Individual NACK
…
Negative acknowledgement
of individual call message
・ Group call… Group call message
・ GEO area call… Area call message
・ All ships call… Call to all ships
・ Distress… Distress alert message
・ Distress ACK… Acknowledgement of
distress alert message
・ Distress relay… Distress relay message
・
Distress relay ACK
… Acknowledgement of
distress relay message
・
Distress relay GEO
… Area call of distress
relay message
Intent
Message code indicating specific content.
Indicates the type of the call for a specific
purpose, not for radiotelephone
communication.
・ Polling… Polling
・ Position RQ… Ship position request
・ Ship position…
Ship position notification
・ Test… Safety test call
Work FRQ/ WFRQ
Message code indicating communication
frequency after a DSC call.
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