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Part Four: Section 2
HTAWS Operation
Obstacle is at or above the aircraft altitude (Red)
250 ft
250 ft
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
Potential Impact Point
Alert Level
WARNING (Red)
CAUTION (Yellow)
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.
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.
190-00356-30 Rev H
