Garmin Pilot User's Guide for iOS User Manual page 133

Symbol
t A
rAFFic dvisories
The GDL 39 automatically adjusts its Traffic Advisory (TA) sensitivity level to reduce
the likelihood of nuisance TA alerts during various phases of flight. TAs are issued for
traffic when they are predicted to be within a specified volume of airspace around your
aircraft in a specified amount of time. The protected volume and time interval varies
based on the current geodetic altitude and groundspeed. Thus, the protected volume
of airspace increases with altitude and ground speed. Refer to the following table for
details.
190-01501-00 Rev. D
Directional airborne Proximity Advisory (PA) with track vector. Points in the
direction of the aircraft track. Proximity Advisories are issued for any traffic
within 6 nautical miles and +/- 1,200'.
Non-directional airborne Traffic Advisory (TA)
Non-directional off-scale airborne Traffic Advisory (TA). Displayed at outer
range ring at proper bearing.
Directional airborne Traffic Advisory (TA) with track vector. Points in the
direction of the aircraft track.
Directional off-scale airborne Traffic Advisory (TA). Points in the direction of
the aircraft track.
Ground traffic without directional information.
Directional surface traffic.
Non-directional non-aircraft ground traffic.
Directional non-aircraft ground traffic.
ADS-B Traffic Symbology
(tA)
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