Terrain Alerts - Garmin G600 Pilot's Manual

4.1.2

Terrain Alerts

TERRAIN uses information provided from the GPS receiver to provide
a horizontal position and altitude. GPS altitude is derived from satellite
measurements. GPS altitude is converted to a mean sea level (MSL)-based
altitude (GPS-MSL altitude) and is used to determine TERRAIN alerts. GPS-MSL
altitude accuracy is affected by factors such as satellite geometry, but it is not
subject to variations in pressure and temperature that normally affect pressure
altitude devices. GPS-MSL altitude does not require local altimeter settings to
determine MSL altitude. Therefore, GPS altitude provides a highly accurate and
reliable MSL altitude source to calculate terrain and obstacle alerts.
TERRAIN utilizes terrain and obstacle databases that are referenced to mean
sea level (MSL). Using the GPS position and GPS-MSL altitude, TERRAIN
displays a 2-D picture of the surrounding terrain and obstacles relative to the
position and altitude of the aircraft. Furthermore, the GPS position and GPS-MSL
altitude are used to calculate and "predict" the aircraft' s flight path in relation
to the surrounding terrain and obstacles. In this manner, TERRAIN can provide
advanced alerts of predicted dangerous terrain conditions. Detailed alert modes
are described in Section 6.
A TAWS warning received from the GNS 500W Series TAWS units will be
displayed above the Altitude Tape. A new warning will flash for approximately
five seconds.
TAWS Annunciation
4-6
TERRAIN has been inhibited by flight crew
Excessive Descent Rate Caution
Excessive Descent Rate Warning
Forward Looking Terrain Avoidance
Forward Looking Terrain Avoidance
Forward Looking Terrain Avoidance
Caution for Obstacle
Forward Looking Terrain Avoidance
Warning for Obstacle
Garmin G600 Pilot's Guide
Description
TAWS not available
Caution for Terrain
Warning for Terrain
190-00601-02 Rev. B