10-35
190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Terrain
10.7.2 HTAWS Limitations
NOTE:
The data contained in the terrain and obstacle databases
comes from government agencies. Garmin accurately processes and
cross-validates the data, but cannot guarantee its accuracy or completeness.
HTAWS displays terrain and obstructions relative to the flight path of the
aircraft. Individual obstructions may be shown if available in the database.
However, all obstructions may not be available in the database and data may be
inaccurate. Never use this information for navigation.
NOTE:
Terrain databases do not consistently represent foliage. Some trees
may extend above HTAWS protection limits in some operating modes.
Terrain information is based on terrain elevation data contained in a database
that may contain inaccuracies. Terrain information should be used as an aid
to situational awareness. Never use it for navigation or to maneuver to avoid
terrain.
HTAWS uses terrain and obstacle information 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.
10.7.3 Power Up
During power-up of the unit, the terrain/obstacle database versions are
displayed along with a disclaimer to the pilot. At the same time, HTAWS
self-test begins. HTAWS gives the following aural messages upon test completion:
• “
HTAWS System Test, OK
,” if the system passes the test
• “
HTAWS System Failure
,” if the system fails the test
A test failure is also annunciated visually for HTAWS, as shown in the HTAWS
Alert Summary table.
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