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Garmin GDL 39 Portable ADS-B and GPS Receiver User’s Guide
190-11110-00 Rev. G
4.3 Software Updates
Software updates for the GDL 39 can be received through your Garmin display
device. See the display device documentation for details. Software updates can
be received through your mobile device by downloading the GDL 39 Utility App
from your mobile device’s mobile app store.
NOTE: The unit will not update software when running off only battery
power.
4.4 Traffic
WARNING: The GDL 39 is an aid for visually acquiring nearby aircraft. It
should never be assumed that the GDL 39 is providing complete information
about the traffic in the area.
The GDL 39 can receive traffic from both the UAT (978 MHz) and Mode S ES
(1090 MHz) data links. Traffic can be received directly from an aircraft with an
ADS-B transmitter or from an FAA ground station. The FAA ground station will
broadcast traffic that is tracked via radar and is called TIS-B traffic. No subscription
fee is required for receiving TIS-B.
The FAA ground station will only broadcast TIS-B traffic that is within ±15 NM
and ±3500 feet of an aircraft with ADS-B Out. To get the full benefits of ADS-B
traffic it is recommended that the aircraft be equipped with an ADS-B transmitter
(such as a GTX 330 w/ES).