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The following alert conditions can affect GPS accuracy.
Ga"GGja =Xµ+ ja"GGja
9ELLOWh,/)v
annunciation.
Loss of Integrity
Integrity of the GPS position does
not meet the requirements for the
current phase of flight. Occurs
before the final approach fix
(if an approach is active).
Unit invalidates active
course guidance.
Annunciation is
specific to cause.
Loss of Navigation
Aircraft is after the final approach
fix and GPS integrity does not meet
the active approach requirements.
Insufficien
t number of satellites
supporting aircraft position (i.e.,
more than 5 seconds pass without
adequate satellites to compute a
position).
GPS sensor detects an excessive
position error or failure that cannot
be excluded within the time to
alert.
On-board hardware failure.
9ELLOWh.O'03
0OSITIONv
annunciation.
Ownship icon not
present
Loss of Position
Unit cannot determine a GPS
position solution.
For information about managing limited navigation features, read
Dead Reckoning in section 3.
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