Raymarine Ray54E Owner's Handbook Manual page 112

102
Term
Tri Watch
US Channels
VOL
VHF
Weather (WX) Channels
Working Channel
Meaning
A function that monitors the Priority Channel and the Favourite
(PLUS) Channel while working on another channel.
Channel designations as defined by the FCC.
Volume key
Very High Frequency (30MHz to 300MHz)
Channels for routine and emergency weather information
broadcast by NOAA (USA).
The currently-selected (non-priority, non-WX) channel.
Ray54E VHF Radio