Garmin GNS 430 - Page 192

GNS 430 Pilot’s Guide and Reference
11-4
SECTION 11
TERRAIN
Terrain and obstacle Database Areas of
Coverage
The following describes the area of coverage available
in each database. Regional definitions may change without
notice.
Worldwide (WW):
Latitudes: S60 to N75
Longitudes: W180 to E180
Americas (AME):
Latitudes: S60 to N75
Longitudes: W180 to W30
Atlantic (A
TL):
Latitudes: S60 to N75
Longitudes: W30 to E90
Pacific (P
AC):
Latitudes: S60 to N75
Longitudes: E60 to E180
United States (US):
Limited to the United States plus some
ar
eas of Canada, Mexico, Caribbean,
and the Pacific.
CAUTION: Obstacles 200 feet and higher are
included in the Obstacle Database. It is very
important 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 Alerting (PDA)’
section (Section 11.3), the Garmin TERRAIN premature
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.
• Enroute Phase - Defined as when the aircraft is
more than 15 nm from the destination airport, or
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:
1) The aircraft is 15 nm or less from the destination
runway.
2) The distance to the destination runway threshold
is decreasing.
3) The aircraft is at or below (lower than) a straight
line drawn between the two points specified in
Table 11-2 (relative to the destination runway).
Distance-to-Runway Height-above-Runway
15
nm 3500 Feet
5 nm 1900 Feet
Table 11-2 Terminal Phase Distance-to-Runway
Versus Height-Above-Runway