400/500 Series Garmin Optional Displays
400/500 Series Garmin Optional Displays
400/500 Series Garmin Optional Displays
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42<br />
Section 3<br />
TERRAIN Alerts<br />
Figure 3-5: ‘TERRAIN has failed’ message<br />
Figure 3-6: ‘TERRAIN NOT AVAILABLE’ display<br />
TERRAIN Failure Alert<br />
The TERRAIN system continually monitors several system-critical items, such as database validity,<br />
hardware status, and GPS status. Should the system detect a failure, a message is annunciated ‘TERRAIN<br />
has failed’ (Figure 3-5).<br />
‘TERRAIN Not Available’ Alert<br />
The TERRAIN system requires a 3D GPS navigation solution along with specific vertical accuracy<br />
minimums. Should the navigation solution become degraded, if the terrain/obstacle database is not<br />
available, or if the aircraft is out of the database coverage area, the annunciation ‘TERRAIN NOT<br />
AVAILABLE’ is displayed on the TERRAIN Page (Figure 3-6).