Garmin GNC 420 User Manual

Page 14

GNC 420/420A Quick Reference

NAVCOM PAGE

190-00140-21 Rev. F

Inhibiting TERRAIN:

1) Select the TERRAIN Page and press the MENU

Key. ‘Inhibit Terrain?’ is selected by default.

2) Press the ENT Key. The ‘TER INHB’ annunciation

is displayed in the TERRAIN annunciator field
when TERRAIN is inhibited.

Annunciator Field

NOTE: Inhibit mode deactivates TERRAIN alerting
when deemed unnecessary by the pilot. Flying
VFR into an area where unique terrain exists could
cause the system to annunciate nuisance alerts.
Pilots should use discretion when inhibiting the
TERRAIN system and always remember to enable
the system when appropriate.

NAVCom PAGe

The NAVCOM Page provides a list of the airport

communication and navigation frequencies at the
departure, enroute, and arrival airports.

Frequency Type

Departure, Enroute, or

Arrival Airport

Assigned Frequency and

Usage Information (When

Applicable)

Scroll

Bar

Selecting a frequency list for a departure,
enroute, or arrival airport:

1) Press the small right knob to activate the

cursor.

2) Turn the large right knob to place the cursor

on the airport identifier field (top line on the
NAVCOM Page).

3) Turn the small right knob to select the desired

airport and press the ENT Key.

Scrolling through the list of frequencies:

1) Activate the cursor, if not already active, by

pressing the small right knob.

2) Turn the large right knob to move the cursor

through the list of frequencies. If there are
more frequencies in the list than can be
displayed on the screen, a scroll bar along the
right-hand side of the screen indicates which
part of the list is currently being displayed.

Auto tuning a frequency from the NAVCOM
Page:

1) Highlight the desired frequency by scrolling

through the list of frequencies, as described in
the preceding procedure.

2) To place a frequency in the standby field of the

COM Window, highlight the desired frequency
and press the ENT Key. (NAV frequencies are
shown for reference only.)

bottom Row ANNUNCiAtoRs ANd messAGes

See Pilot’s Guide for detailed information.