Restoring Factory Settings; Terrain Operation; Terrain Limitations; Terrain Page - Garmin GPS 400W,GNC 420W Pilot's Manual & Reference

Restoring Factory Settings

"Restore Defaults?" resets all four user-selectable
data fields to their original factory default settings.
To restore the factory default settings, press
MENU and turn the large right knob to highlight
"Restore Defaults?", then press ENT.

Terrain Operation

During power-up of the 400W Series unit, the
terrain/obstacle database versions are displayed along
with a disclaimer. At the same time, the TERRAIN
system self-test begins. A failure message is issued if
the test fails.

Terrain Limitations

Terrain Proximity displays altitudes of terrain
and obstructions relative to the aircraft position and
altitude with reference to a database that may contain
inaccuracies. Terrain and obstructions are shown
only if they are in the database. Terrain and obstacle
information should be used as an aid to situational
awareness. They should never be used to navigate or
maneuver around terrain.
Note that all obstructions may not be available
in the terrain and obstacle database. No terrain and
obstacle information is shown without a valid 3-D GPS
position.

Terrain Page

To display the TERRAIN Page, select the NAV
group and turn the small right knob until the
TERRAIN Page is displayed. The page displays terrain
information, aircraft ground track, and GPS-derived
MSL altitude. Altitude is shown in increments of 20
feet or in increments of 10 meters, depending on unit
configuration. The "G" to the right of the MSL altitude
display reminds the pilot that altitude is GPS-derived.
2 - NAV PAGES
Terrain Operation
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