- The GDL 39 features ADS-B “In” datalink technology that allows it to receive subscription-free Flight Information Service-Broadcast (FIS-B) weather information over the FAA’s 978 MHz Universal Access Transceiver (UAT) uplink. ..... (not working in Europe)

- The GDL 39 can receive ADS-B position reports directly from other aircraft in your vicinity..... (This will work like Achim said)

- ADS-B “In” technology also allows the GDL 39 to receive Traffic Information Service-Broadcast (TIS-B) information. (not working in Europe)

Das ist alles. Es ist in der Mehrzahl nutzlos.