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124
Term
ITU
MMSI
NOAA
Position Request
Priority Channel
Priority Scan
PTT switch
RF
RTCM
RX
SAR
Saved Scan
Semi-duplex
Simplex
SOG
Squelch
TX
Tri Watch
US Channels
VOL
VHF
Working Channel
Ray218E and Ray55E Marine VHF Radios
Meaning
International Telecommunications Union (EU)
Maritime Mobile Service Identity; a number issued by each
country to identify maritime stations, much like a telephone
number.
National Oceanographic and Atmospheric Administration (US)
A DSC call requesting GPS position information from any
station for which an MMSI number is known. You can also send
out your position to other stations.
Channel 16
A feature that alternates monitoring the Priority Channel 16
with each of the regular channels.
Microphone push-to-talk switch
Radio Frequency
Radio Technical Commission for Maritime Services
Receive
Search And Rescue
Scans only user-selected memory channels
Channels using separate frequencies to transmit and receive.
Channels transmitting and receiving on the same frequency.
Speed Over Ground
A circuit that sets the threshold for cutting off the receiver when
the signal is too weak for reception of anything but noise.
Transmit
A function that monitors the Priority Channel (16), the Second-
ary Priority (PLUS) Channel, and one other channel that you
choose.
Channel designations as defined by the FCC
Volume key
Very High Frequency (30MHz to 300MHz)
The currently-selected (non-priority, non-WX) channel
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