General Database Information; Database Versions - Garmin GNC 420AW Pilot's Manual

Part Four: Section 2
HTAWS Operation
250 ft
250 ft
Potential Impact Point
HTAWS Alert Coloring and Symbology

General Database Information

Garmin HTAWS uses terrain and obstacle infor-
mation supplied by government sources. The data
undergoes verification by Garmin to confirm accuracy
of the content. However, the displayed information
should never be understood as being all-inclusive.
Pilots must familiarize themselves with the appropri-
ate charts for safe flight.
NOTE: The data contained in the terrain and obstacle data-
bases comes from government agencies. Garmin accurately
processes and cross-validates the data, but cannot guarantee
the accuracy and completeness of the data.
The terrain/obstacle databases are contained on a
datacard which is inserted in the right-most slot of the
400W/500W Series units.
52
Obstacle is at or above the aircraft altitude (Red)
Obstacle is between 250 ft and 0 ft
below the aircraft altitude (Yellow)
Obstacle is 250 ft, or more,
below the aircraft altitude (Gray)
HTAWS Obstacle Altitude Colors and Symbology
Alert Level
WARNING (Red)
CAUTION (Yellow)
190-00356-30 Rev H

Database Versions

The version and area of coverage of each terrain/
obstacle database is shown on the Terrain Database Ver-
sions Page, located in the AUX Page Group. Databases
are checked for integrity at power-up. If a database
is found to be missing and/or deficient, the HTAWS
system fails the self-test and displays the HTAWS
system failure message.