Garmin 530w Guida Utente

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The TERRAIN system requires a 3D GPS 

navigation solution along with specific vertical 
accuracy minimums. Should the navigation solution 
become degraded, if the terrain/obstacle database is 
not available, or if the aircraft is out of the database 
coverage area, the annunciation “TERRAIN NOT 
AVAILABLE” is displayed on the TERRAIN Page. 

Terrain Alerts