Power Up - Garmin GTN 625 Pilot's Manual

altitude of the aircraft. The GPS position and GSL altitude are used to calculate
Foreword
and "predict" the aircraft' s flight path in relation to the surrounding terrain and
obstacles. In this manner, HTAWS can provide advanced alerts of predicted
Getting
Started
dangerous terrain conditions. Detailed alert modes are described later in this
section.
Audio &
Xpdr Ctrl
10.5.2.2
Com/Nav
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-
FPL
test begins. HTAWS gives the following aural messages upon test completion:
Direct-To
• "HTAWS System Test, OK", if the system passes the test
• "HTAWS System Failure", if the system fails the test
Proc
A test failure is also annunciated visually for HTAWS, as shown in the HTAWS
Alert Summary table.
Wpt Info
10.5.3
Map
HTAWS is shown on the Terrain page when HTAWS is available.
Traffic
360º View
Terrain
Terrain Legend
Weather
HTAWS Terrain
Colorization Overlay
Nearest
Services/
Music
Utilities
Terrain information, aircraft ground track, and GPS-derived MSL altitude are
System
displayed on the page. The "GSL" above altitude display in the top right corner
of the display reminds the pilot that altitude is GPS-derived.
Messages
Symbols
Appendix
Index
10-24

Power Up

HTAWS Page
Icon shows point
obstacle overlay
is active (software
version 5.12, or later)
Figure 10-18 Terrain/HTAWS Page
Garmin GTN 625/635/650 Pilot's Guide
Icon shows wire obstacle
overlay is active (software
version 5.12, or later)
Rotorcraft
Ownship
HTAWS
Annunciation
190-01004-03 Rev. K