Com Radio (Com); Squelch (Sq); Tx/Rx; Monitor (Mon) - Garmin GNS 480 Pilot's Manual

Basic Operation
Com Radio
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Press COM to activate control of the internal Com Radio. Pressing COM again returns you to the previous
mode. All other functions will continue to function normally, such as navigation of active flight plans. Turn the
PWR/VOL knob to control the Com volume. External controls for the Flip-Flop and up/down control can be
made depending on installation.

Squelch (SQ)

Press the SQ key to toggle the Com receiver squelch function. When squelch is active, the Squelch (SQ) annun-
ciator will appear on the left side of the active frequency display and the SQ function label will be highlighted.

Tx/Rx

Transmit (Tx) or Receive (Rx) indications replace the "SQ" indication when they are used. Tx appears when the
mic is keyed. Rx appears when a receiving.

Monitor (MON)

Press the MON key to toggle the Standby channel monitoring function. When Monitor mode is active, the
MON annunciator will appear on the left side of the standby frequency and the MON function label will be
highlighted. Frequency monitoring allows you to listen to the Standby frequency while the GNS 480 moni-
tors the Active frequency for activity. When the Active frequency receives a signal, you will hear the Active
frequency until its activity stops. The frequency monitoring function is inhibited while you are transmitting.

Recall (RCL)

1. Press the RCL key to display the menu of Recent, User, or Emergency frequencies.
2. Press the <SBY key to insert the selected frequency as the Standby frequency.
3. Press the <A> key to insert the selected frequency as the Active frequency and set the previous Active
frequency as Standby frequency.

Recent

1. Press the Recent key to bring up a list of the last eight frequencies used as the Active frequency.
2. Turn the Large knob to highlight a frequency.
3. Press the <SBY or <A> keys to insert the frequency.
4. Press the Menu/Enter key if no choice is desired.

Com Radio (COM)