Raymarine Ray230 Owner's Handbook Manual page 114

Appendix
Monitoring
Channel 16 and Working Channel
When - your VHF station is turned
on and it is not being used
to exchange
communications
You Must - monitor channel 16
As an operating convenience, many
stations employ a second receiver so
that they can monitor a working
channel and channel 16 simultaneously.
Intership Safety
Channel: 6
Vessels: Any
Use: Communicating
navigational and weather
warnings to other ships
Communicating with U.S. Coast Guard
stations or other vessels during search
and rescue operations
Between: Ship-to-ship only
Comments: Do not use for routine
communications. This is a
safety channel.
5-5