Part Four: Htaws Interface; Section 1: Introduction; Overview; Operating Criteria - Garmin GNC 420AW Pilot's Manual

Part Four:
HTAWS Interface

Section 1: Introduction

NOTE: Either the TERRAIN, TAWS (500W-series only),
HTAWS, or Terrain Proximity functionality will be available
via the Terrain page, depending on the installed hardware
and configuration.

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 TAWS satisfies TSO-C194
requirements for certification.
HTAWS provides visual and aural annunciations
when terrain and obstacles are a hazard to the aircraft.
HTAWS Page with Terrain Alert
NOTE: HTAWS-enabled units can be identified by
observing the power-up screens. HTAWS-enabled
units will display "HTAWS" after the model number.
HTAWS-enabled units can also be identified by going to
the Terrain page and checking the upper left-corner for
"HTAWS."

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.

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 the accuracy and completeness of the
data.
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.
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 sup-
plied by government sources. The data undergoes veri-
fication by Garmin to confirm accuracy of the content.
However, the displayed information should never be
understood as being all-inclusive.
190-00356-30 Rev H
Part Four: Section 1
HTAWS Introduction
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