Garmin GNS 430 Pilot's Manual And Reference page 33

To select a COM frequency for any airport
in the database:
Turn the large right knob to select the NRST
1)
Page Group.
2) Turn the small right knob to select the Airport
Frequencies Page (Figure 2-9).
Figure 2-9 Airport Frequencies Page
Press the small right knob to place the cursor
3)
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.
Turn the large right knob to highlight the
5)
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:
GNS 430 Pilot's Guide and Reference
Press and hold the COM Flip-flop Key for
approximately two seconds (Figure 2-10).
Figure 2-10 Emergency Channel Active
SECTION 2
COM
2-5