Garmin GNS 400W GPS Receiver User Manual


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2 - NAV PAGES
50
190-00357-00 Rev E
TERRAIN Failure Alert
The TERRAIN system continually monitors
several system-critical items, such as database validity,
hardware status, and GPS status. Should the system
detect a failure, a message is annunciated “TERRAIN
has failed”.
“TERRAIN has failed” message
“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
Terrain Alerts







(EIGHT!BOVE4ERRAIN&EET
$ISTANCE&ROM$ESTINATION!IRPORTNM
              
0$!!LERTING!REA0$!!LERTING!REA
2UNWAY
4HRESHOLD
Premature Descent Alerting (PDA) Threshold
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