Terrain/Obstacle Database Areas Of Coverage; Navigation Database; Terrain Phase Of Flight - Garmin GPS 400W,GNC 420W Pilot's Manual & Reference

To update the terrain or obstacle database:
1. Acquire a new terrain data card from
Garmin.
2. Turn off the power to the 400W Series unit.
3. Remove the old terrain data card from and
insert the new card into the right-most slot of
the 400W Series unit.
4. Turn on the 400W Series unit and verify that the
TERRAIN system passes the self-test.The "TER
TEST" annunciator will clear after checking and
no failure message appears.

Terrain/Obstacle Database Areas of Coverage

The following describes the area of coverage avail-
able in each database. Regional definitions may change
without notice.
The terrain and airport terrain databases include
worldwide coverage that includes: Latitudes South 60°
to North 75°.
The obstacle database provides coverage for the
USA and Europe that includes:
United States: Limited to the United States, some
areas of Canada, Mexico, the Caribbean, and the
Pacific.
Europe: Limited to Austria, Belgium, Czech Repub-
lic, Denmark, Estonia, Finland, France, Germany,
Greece, Iceland, Ireland, Italy, Latvia, Lithuania, Neth-
erlands, Norway, Poland, Portugal, Slovakia, Spain,
Sweden, Switzerland, and the United Kingdom.
CAUTION: Obstacles 200 feet and higher are in-
cluded in the Obstacle Database. It is very impor-
tant to note that not all obstacles are necessarily
charted and therefore may not be contained in
the Obstacle Database.

Navigation Database

As explained in the "Premature Descent Alert-
ing (PDA)" section, the Garmin TERRAIN prema-
ture descent alerting (PDA) algorithms utilize data
contained in the Navigation Database. It is therefore
important to also have the latest Navigation Database
installed to ensure correct TERRAIN alerting.

Terrain Phase of Flight

The TERRAIN Phase of Flight definitions are listed
below:
En Route Phase - Defined as when the conditions
for Terminal, Approach, and Departure Phases are not
met.
Terminal Phase - Defined as when all three of the
following conditions are met:
• The aircraft is 15 NM or less from the destination
runway.
• The distance to the destination runway threshold
is decreasing.
• The aircraft is at or below (lower than) a straight
line drawn between the two points specified in the
table below (relative to the destination runway).
Distance to Runway
15 NM
5 NM
Approach Phase - Defined as when all three of
the following conditions are met:
• The distance to the destination runway threshold
is equal to or less than 5 NM.
• The height above the destination runway thresh-
old elevation is equal to or less than 1000 feet.
• The distance to the destination runway threshold
is decreasing.
2 - NAV PAGES
Terrain Operation
Height above Runway
3500 feet
1900 feet
45