Garmin GNS 430 - Manual (Page 33)

GNS 430(A) Pilot’s Guide and Reference 190-00140-00 Rev. P 2-5
SECTION 2
COM
To select 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 430’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.
To quickly tune and activate 121.500:
Press and hold the COM Flip-flop Key (or COM
Remote Transfer Switch) for approximately two
seconds (Figure 2-10).
Figure 2-10 Emergency Channel Active
If the COM Remote Transfer switch is used to select the
emergency channel, further changes in COM frequency
will not be possible without momentarily pressing the
COM Remote Tranfer Switch again, or by recycling
power.
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.