Garmin GNC 420AW GPS Receiver User Manual


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2 - NAV PAGES
49
190-00356-00 Rev E
Terrain Alerts
“TERRAIN Not Available” Alert
TheTERRAINsystemrequiresa3DGPS
navigation solution along with specific vertical
accuracy minimums. Should the navigation solution
become degraded, or if the aircraft is out of the
database coverage area, the annunciation “TERRAIN
NOTAVAILABLE”isdisplayedontheTERRAINPage.
“TERRAIN NOT AVAILABLE” display
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