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GNS 530(A) Pilot’s Guide and Reference
190-00181-00 Rev. E
2-5
SECTION 2
COM
Selecting a COM frequency for any airport
in the database:
1) Turn the large
right knob to select the WPT
Page Group.
2) Turn the small
right knob to select the Airport
Frequencies Page (Figure 2-9).
Figure 2-9 Airport Frequencies Page
3) Press the small right knob to place the cursor
on the airport identifier field.
4) Use the small and large
right knobs to enter
the identifier of the desired airport. Press the
ENT Key when finished.
5) Turn the large right knob to highlight the
desired frequency.
6) Press the ENT Key to place the highlighted
frequency in the standby COM Window field.
Emergency Channel
The GNS 530’s emergency channel select provides
a quick method of selecting 121.500 MHz as the
active frequency in the event of an in-flight emergency.
Emergency channel select is available anytime the unit
is on, regardless of GPS or cursor status, or loss of the
display.
Quickly tuning and activating 121.500:
Press and hold the COM Flip-flop Key for
approximately two seconds (Figure 2-10).
Figure 2-10 Emergency Channel Active
Stuck Microphone
As mentioned previously in this section, when the GNS
530 is transmitting, a ‘TX’ indication appears in the COM
Window. If the microphone key is stuck or accidentally
left in the on position; or the microphone continues to
transmit after the key is released, the COM transmitter
automatically times out (ceases transmitting) after 35
seconds of continuous broadcasting. A ‘COM push-to-
talk key stuck’ message (Figure 2-11) is displayed as long
as the condition continues.
Figure 2-11 Message Page