Garmin VHF 720 - Manual (Page 40)

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Glossary
APPENDIX F
Glossary of Radio Terminology and Abbreviations
Canadian Channels: Channel designations as defined by the
International Telecommunications Service,
(ITS).
Duplex: Transmit and receive on different frequencies.
FM: Frequency Modulation
International Channels: Channel designations as defined for use
in international waters by the ITS.
PTT: Press-To-Talk switch
RF: Radio Frequency
RX: Receive
Simplex: Transmit and receive on the same frequency.
Squelch: To suppress background noise.
Tri-Watch: Monitors Channels 16 and 9 while working on yet
another user designated channel.
TX: Transmit
U.S.A. Channels: Channel designations as defined by the FCC.
VHF: Very High Frequency (30 MHz to 300 MHz)
Weather Channels: Channel designations as defined by the FCC.