Introduction - Garmin GTN 625 Pilot's Manual

10.4 HTAWS (Optional)
10.4.1

Introduction

NOTE: TERRAIN, TAWS, 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
version 4.00, or later.
10.4.1.1 Overview
Garmin' s Helicopter Terrain Awareness Warning System (HTAWS) is an
optional feature to increase situational awareness and aid in reducing controlled
flight into terrain. Garmin HTAWS is TSO-C194 authorized. Units installed in
helicopters that do not have HTAWS installed will display HTerrain Proximity.
This is noted by the five color terrain scale which is appropriate to the low
altitude operating environment for helicopters.
HTAWS provides visual and aural annunciations when terrain and obstacles
are a hazard to the aircraft.
NOTE: HTAWS-enabled units can be identified by going to the Terrain
page and checking the lower right-corner for "HTAWS."
10.4.1.2 Operating Criteria
Garmin HTAWS requires the following to operate properly:
• The system must have a valid 3D GPS position solution
• The system must have a valid terrain/obstacle database.
190-01004-03 Rev. F
Figure 10-17 Map Page with Terrain
Garmin GTN 625/635/650 Pilot's Guide
HTAWS Relative
Terrain Depiction
Rotorcraft Ownship
Foreword
Getting
Started
Xpdr Ctrl
Com/Nav
FPL
Direct-To
Proc
Wpt Info
Map
Traffic
Terrain
Weather
Nearest
Services/
Music
Utilities
System
Messages
Symbols
Appendix
Index
10-19