Garmin GDU 37X Pilot's Manual page 174

Hazard Avoidance
Symbol
*Ground traffic is only displayed on the Map Page when the aircraft is on the ground or below 1,500 feet
AGL. Ground traffic is always displayed on the dedicated traffic page.
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 specified amount
of time 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.
Altitude
(Geodetic)
Below 5,000
5,000-10,000
10,000-20,000
20,000-42,000
Above 42,000
156
*Non-directional non-aircraft ground traffic. Ground traffic is only displayed
when own aircraft is below 1,500 feet AGL or on the ground.
*Directional non-aircraft ground traffic. Ground traffic is only displayed when
own aircraft is below 1,500 feet AGL or on the ground.
ADS-B Traffic Symbology
(ta)
Look Ahead
Time (sec.)
30
40
45
48
48
Traffic Advisories
Garmin GDU 37X Pilot's Guide
™
Description
Vertical
Separation (ft.)
+/-850
+/-850
+/-850
+/-850
+/-1,200
Horizontal
Separation (nm.)
.35
.55
.80
1.10
1.10
190-01054-00 Rev. E