Terrain Alerts - Garmin GI 275 Pilot's Manual

Item Displayed
Terrain Function Identifier
Terrain Overlay Icons
Selecting the 'Terrain' Page view:
1) From the 'Terrain' Page, open the page menu and select Terrain Options.
2) Select the View Button to toggle between 360° and Arc.
Displaying active flight plan information on the 'Terrain' Page:
1) From the 'Terrain' Page, open the page menu and select Terrain Options.
2) Select the Flight Plan Button to enable/disable the flight plan overlay setting.
Displaying the legend on the 'Terrain' Page:
1) From the 'Terrain' Page, open the page menu and select Terrain Options.
2) Select the Legend Button to enable/disable the display of the legend.

TERRAIN ALERTS

Alerts are issued when flight conditions meet parameters that are set by the configured
terrain function. Terrain alerts typically employ a CAUTION or a WARNING alert severity
level, or both. When an alert is issued, visual annunciations are displayed.
Forward Looking Terrain Avoidance (FLTA) compares the projected flight path as derived
from GPS data with terrain features and obstacles from the terrain and obstacle databases.
FLTA alerts are issued when the projected flight path conflicts with terrain or obstacles. The
projected flight path is a calculated area ahead of, to the sides, and below the aircraft. The size
of the projected flight path varies based on factors including ground speed (the path ahead is
larger when the ground speed is higher), whether the aircraft is level, turning, or descending,
and the proximity to the nearest runway along the current track. As the aircraft approaches
the runway, the projected flight path becomes narrower until FLTA is disabled or alerts are
inhibited. The system automatically disables FLTA alerts when the aircraft is less than 200 feet
above the destination runway elevation while within 0.5 nm of the approach runway or the
aircraft is between runway ends.
190-02246-01 Rev. A
Indicates the active terrain function on the 'Terrain' Page.
Indicates when terrain or obstacles are displayed for the
current range setting when enabled on the 'Map' Page and
the 'HSI Map' Page
Terrain Display Items
Garmin GI 275 Pilot's Guide
Hazard Avoidance
Description
145