Garmin Pilot Guida Utente

190-01532-00  Rev. G

118

ADS-B traffic operation is similar to other traffic systems, but ADS-B adds additional 

symbology.  The symbols used to display ADS-B traffic are shown in  the table below.  The 
traffic identifier and altitude are displayed below the traffic symbol.  A small up or down 
arrow next to the traffic symbol indicates that the traffic is climbing or descending at 
a rate of at least 500 feet per minute. The vector line that extends beyond the point of 
the traffic arrow is just further indication of the intruder aircraft track.

Non-threat, non-directional airborne traffic

Directional airborne Traffic with track vector.  Points in the direction of the 
aircraft track. 

Non-directional airborne Proximity Advisory (PA).  Proximity Advisories are 
issued for any traffic within 6 nautical miles and +/- 1,200’.
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.

The GDL 39 / GDL 39 3D 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