Users Manual

xxiv
SAR Convention
International Convention on Maritime Search
and Rescue
SOLAS Convention
The international convention applied to all
ships engaged on international voyages. A
safety certificate is issued if the conditions of
this convention are satisfied.
SQL (Squelch)
A function that acts to suppress the audio
output of a receiver in the absence of a
sufficient radio strength signal.
Station
A radio station, or a control terminal for radio
equipment
USCG
United States Coast Guard
UTC
Universal Time Coordinated
VDR
Voyage Data Recorder
After a maritime accident, recovered to
analyze the recorded data (speed, rudder,
bridge conversation, VHF audio, etc.) to
determine the cause of the accident.
It can also transmit navigation management
data regularly via Inmarsat to land.
VHF
Very High Frequency (30 - 300MHz)
VOL
Loudspeaker volume
WRC
World Radiocommunication Conference
WMO
World Meteorological Organization
WKR
Watch Keeping Receiver
Dedicated receiver for CH70 to watch the
DSC signals.
● DSC terms
Address
General term for Maritime Mobile Service
Identity number (MMSI)
This equipment uses TO/FROM to
distinguish between the sender and receiver.
It also means the SELF-ID (own ship MMSI)
and DIST-ID (MMSI of a ship in distress).
Category
Message code indicating priority of the call.
It contains types as below.
・ ROUTINE .. General calls for routine works
・ SAFETY .... Safety communications call
・ URGENCY Urgent communications call
・ DISTRESS Distress alert
DROBOSE
Distress relay call (to individual or to area)
on behalf of someone else who is in distress.
EOS (End Of Sequence)
Termination code appended to the call
messages.
It contains types as below.
・ EOS ........... End of sequence
・ ACK RQ .... Acknowledgement request
・ ACK BQ ..... Acknowledgement responding
to the ACK RQ
ECC (Error Check Character)
Error check code appended to the end of call
messages.
This is not normally displayed, but if an error
occurs, one of the following will be displayed.
・ ECC ERROR ......... Message error
・ EX ECC ERROR .... Expansio n message error
Format
Message code indicating type of call.
It contains types as below.
・ Individual call ......... Individual call
・ Individual ACK ....... Acknowledgement
response to individual call
・ Individual NACK .... Negative acknowledgement
response to individual call
・ Semi/auto call ........ PSTN connection call
・ Semi/auto ACK ...... PSTN call
acknowledgement
・ Semi/auto NACK ... PSTN call negative
acknowledgement
・ Group call .............. Call to ships having
common interest
・ All ships call ........... Call to all ships
・ Distress.................. Distress alert