Modes; Changing Channel - Simrad RS90S User Manual

Modes

The RS90S has several different modes of operation. The main mode
is standby mode, during which the radio is ready to send or receive
VHF calls. Generally, pressing the [X] key will exit any special mode
and return to standby mode.
Scanning mode
In scanning mode, the radio scans selected channels for radio
activity.
Navigation mode
Navigation mode displays distance and bearing to a selected
waypoint.
Hailer mode
Hailer mode allows you to use the radio to hail other vessels or deck
crew through a connected loud-hailer speaker.
Hailer mode also features a listen-back mode, which uses the PA
speaker as a microphone to listen for a response.
Fog horn mode
Fog horn mode allows you to use the radio to sound a fog horn
tone through a connected loud-hailer speaker.
Intercom mode
Intercom mode allows you to use the handsets to communicate
from one handset to the others in your vessel.
Standby Mode
In standby mode, the RS90S displays the main operating screen on
the handset(s) and is ready to send or receive calls on the selected
channel.

Changing channel

Different jurisdictions in the world have allocated different sets
of VHF radio channels for different purposes. These sets are
known as channel banks. The available channel banks and their
corresponding channels are given in "Appendix 7 - Channel charts"
on page 119.
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