Garmin GNC 420 Pilot's Manual & Reference page 16

TAKEOFF TOUR
Selecting COM
Frequencies
Satellite status page with cursor in the COM
window.
To switch the active and standby frequencies,
W
press the key. Switching the active and
standby frequencies will not remove the cur-
sor from the COM window.
8
While the GNC 420 is acquiring a position, let's take a minute to dial in the active
and standby frequencies you'll be using for the fi rst phase of your fl ight. The GNC 420's
display is divided into separate 'windows' (or screen areas), including a COM window,
data fi eld and the GPS window (the right 3/4 of the display).
Active Frequency on top &
Standby on bottom
(highlighted by cursor)
{
COM Window
User Selectable
{
Data field
{
Flight Phase
Indicator/Annunciator
To select the active frequency, you must fi rst enter the frequency in the standby fi eld,
W
and use the key to move it to the active fi eld.
To change the standby communication frequency:
1. Rotate the large left knob (
kHz of the desired frequency.
W
2. Pr ess the key to place the standby communication frequency in the active field.
Once you've entered the active frequency, simply repeat step 1 above, to enter the
standby frequency.
h
) to select the MHz, and the small left knob (
}
GPS Window
f
) to select the