10-51190-01004-03 Rev. P
GTN 625/635/650 Pilot’s Guide
Foreword
Getting
Started
Audio &
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
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System
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Symbols
Appendix
Index
10.8 TAWS-A (Optional)
NOTE: TERRAIN, TAWS-A, TAWS-B, HTAWS, or HTERRAIN PROXIMITY
functionality will be available via the Terrain page, depending on the
installed hardware and configuration. HTAWS or HTERRAIN PROXIMITY
are available in software v4.00, or later. TAWS-A is available in software
v5.00, or later.
NOTE: The data contained in the TAWS databases comes from government
agencies. Garmin accurately processes and cross-validates the data but
cannot guarantee its accuracy or completeness.
TAWS-A (Terrain Awareness and Warning System - Class A) is an optional
feature to increase situational awareness and aid in reducing controlled flight
into terrain (CFIT). TAWS-A provides visual and aural annunciations when
terrain and obstacles are within the given altitude threshold from the aircraft.
TAWS-A satisfies TSO-C151c Class A and TSO-92c requirements for
certification.
10.8.1 TAWS-A Requirements
• A valid terrain/obstacle/airport terrain database
• A valid 3-D GPS position solution
• Valid flap and landing gear status inputs
• A valid radar altimeter
10.8.2 TAWS-A Limitations
TAWS-A uses terrain and obstacle information supplied by government
sources. Terrain information is based on terrain elevation information in a
database that may contain inaccuracies. Individual obstructions may be shown if
available in the database. The data undergoes verification by Garmin to confirm
accuracy of the content, per TSO-C151c. However, the displayed information
should never be understood as being all-inclusive and data may be inaccurate.
Class A TAWS incorporates radar altimeter input with the GSL altitude to
provide a more accurate position reference when at lower altitudes for certain
alert types, and to retain a level of ground proximity warning capability in the
unlikely event of an airport, terrain or obstacle database failure.
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