Garmin Rino 130 Owner's Manual page 24

Reference
Radio Page
The Code field is blank
when the unit is scanning or
monitoring channels.
10
The 'Monitor' option lets you listen to a single channel for any activity, including static and
weak voice signals. The Rino series automatically squelches a frequency to filter out unwanted
noise. Using the Monitor option temporarily turns off the automatic squelch, allowing you to
hear the open channel. If you see a broken transmission symbol (see page 17), there is activity
on your selected channel, but the incoming signal does not match the Squelch Code your unit
is using. You may choose to monitor a channel if you wish to hear all the activity on a channel.
To scan or monitor a channel(s):
1. Using the THUMB STICK
THUMB STICK IN. 'Scan' starts searching through the available channels. 'Monitor' opens
the channel to listen to any radio transmissions on that channel.
2. To stop using either option, highlight the button with the
, highlight the 'Scan' or 'Monitor' button and then press the
and press IN.
THUMB STICK