Changing Channel - Simrad RS90 Operating Manual

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.
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 RS90 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 11 - US and ROW
VHF marine channel charts" on page 114.
Normally the radio should be left tuned to the priority channel
(CH16 or CH09) in case an emergency call is broadcast on that
channel. The RS90 can also be set to monitor several channels at the
same time. In this case, the radio continuously scans the selected
channels and, if activity is heard on a channel, it will switch to that
channel while the activity continues. Then it will revert to scanning.
See "Scanning channels" on page 34.
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Getting started | RS90 Operating Manual