Emergency Channel; Stuck Microphone - Garmin GNS 530W Pilot's Manual & Reference

1 - COM
Emergency Channel / Stuck Mic

Emergency Channel

The GNS 530W' s emergency channel select pro-
vides a quick method of selecting 121.500 MHz as the
active frequency in the event of an in-flight emergency.
The emergency channel select is available whenever
the unit is on, regardless of GPS or cursor status, or
loss of the display.
Press and hold the COM flip-flop key for
two seconds to activate the 121.500 MHz
emergency frequency.
To quickly tune and activate 121.500, press and
hold the COM flip-flop key for approximately two
seconds.
NOTE: Under some circumstances if the com system
loses communication with the main system, the radio
will automatically tune to 121.500 MHz for transmit
and receive regardless of the displayed frequency.
28
GNS 530W only

Stuck Microphone

Whenever the GNS 530W is transmitting, a
"TX" indication appears in the COM window. If the
microphone is stuck or accidentally left in the keyed
position, or continues to transmit after the key is
released, the COM transmitter automatically times out
(or ceases to transmit) after 35 seconds of continuous
broadcasting. You will also receive a "COM push-to-
talk key stuck" message as long as the stuck condition
exists.
A "COM push-to-talk key stuck" message
appears to warn you of a stuck microphone.
Transmitting is disabled after 35 seconds of
continuous broadcasting.