Avidyne IFD540 Installationshandbuch Seite 99

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Map Pages 3-21
TERRAIN
Both Terrain Awareness (TA) and Forward Looking Terrain
Alerting (FLTA) are meant to serve as an aid to situational
awareness. They are intended to provide terrain and obstacle
awareness in the proximity of your aircraft. They are not meant to
be the sole means of terrain or obstacle avoidance.
Both TA and FLTA use a GPS-based MSL altitude and a 9 arc-
sec terrain database (WGS-84) to display a two dimensional
scene representing an “exocentric” look-down-from-above view.
The database is loaded on the IFD prior to shipping from the
factory, and is capable of being updated in the same manner as
other onboard databases, if necessary.
Both TA and FLTA compute height above terrain via GPS inputs
and are not a radio altimeter (RADALT).
TERRAIN AWARENESS (TA)
TA is for general situational awareness purposes and consists of
hatched terrain on any map page. TA will not generate a CAS
message or aural alert.
Terrain Awareness (TA)
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