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Garmin Pilot for Android User’s Guide

190-01532-00 Rev. G

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information on both frequencies. The GDL 39 / GDL 39 3D is unique in its ADS-B In

capability since it can receive data link information from both 1090 ES transponders

and UATs.

Thus, the GDL 39 / GDL 39 3D receives trafﬁc information directly from any ADS-B

Out aircraft within range as well as the rebroadcast of ADS-B information from any

nearby GBT. This rebroadcast is called Automatic Dependent Surveillance-Rebroadcast

(ADS-R) and is automatically triggered by the detection of an ADS-B participating

aircraft within the service volume of the GBT. As a 978 MHz (UAT frequency) receiver,

the GDL 39 / GDL 39 3D can receive both the Trafﬁc Information Service-Broadcast

(TIS-B) and Flight Information Service-Broadcast (FIS-B) provided in conjunction with

ADS-R services when in range of a GBT.

FIS-B service is provided continuously, but ADS-R including TIS-B will only be

broadcast by a GBT when an ADS-B participating aircraft is within the GBT’s deﬁned

service volume. In this case, a GBT will only rebroadcast TIS-B information relative

to the ADS-B participating aircraft. Only trafﬁc that is within 15 nm lateral

and 3,500’ vertical of the ADS-B participating aircraft is provided in the

broadcast. Non-participating trafﬁc aircraft located farther than 15 nm laterally and

3,500’ vertically from the participating aircraft is are excluded from the information

transmitted by the GBT.

TIS-B trafﬁc information includes non-participating aircraft detected by ATC

surveillance radar. As TIS-B data is derived from ATC surveillance radar data, TIS-B

trafﬁc position updates typically occur every three to thirteen seconds. Therefore,

TIS-B trafﬁc may be displayed with degraded positional accuracy. Aircraft

without operating transponders are invisible to TIS-B. Aircraft operating

outside of the ATC radar coverage area are also not displayed.

Since the GDL 39 / GDL 39 3D is a receive-only device, even when used onboard

an aircraft equipped with a qualifying GPS and 1090 ES transponder, a GBT may not

identify it as an ADS-B participating aircraft. The squitter of some 1090 ES transponders,

including the Garmin GTX 23ES, must be conﬁgured to communicate that the aircraft

has 978 MHz receive capability in order to be identiﬁed as an ADS-B participating

aircraft.

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