Garmin aera 500 Series Pilot’s Guide
190-01117-02 Rev. C
115
Hazard Avoidance
Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices Index
DATA LINK TRAFFIC (GDL 39)
The GDL 39 is a receive-only data link radio with on-board GPS, 978 MHz (Universal
Access Transceiver frequency band), and 1090 MHz Extended Squitter (1090 ES)
receivers. It is designed to receive, process, and output traffic (ADS-B air-to-air, and
TIS-B traffic information), and weather (Flight Information Service-Broadcast (FIS-B))
information to the aera through a power/data cable.
ADS-B (Automatic Dependent Surveillance-Broadcast) is a surveillance technology
deployed across the United States as the cornerstone of the FAA’s Next Generation Air
Transportation System (NextGen). ADS-B enables improved surveillance services, both
air-to-air and air-to-ground, especially in areas where radar is ineffective due to terrain
or where it is impractical or cost prohibitive. Initial applications of air-to-air ADS-B are
for “advisory” use only, enhancing a pilot’s visual acquisition of other nearby ADS-B
equipped aircraft either when airborne or on the airport surface.
18,000 FT
10,000 FT
GPS
RADAR
ATC
1090 ES
UAT
RADAR
Composite
ADS-B
Ground
Station
Mode A/C
1090 ES
1090 ES
UAT
UAT
UAT
ADS-B System
For the purpose of distinguishing between levels of ADS-B service, there are three
classifications of aircraft or system capability; ADS-B In, ADS-B Out, and ADS-B
participating. ADS-B In refers to the capability to receive ADS-B information. ADS-B
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