1-1190-01122-03 Rev. C Garmin GDL 88 ADS-B Transceiver Pilot’s Guide1 INTRODUCTIONThe GDL 88 is a remotely mounted ADS-B transceiver. There are four modelsof the GDL 88(D). Models with a single bottom mounted UAT antenna meet TSOC154c Class A1S and are available with or without an internal GPS/SBAS receiver.Models with one top mounted and one bottom mounted antenna meet TSO C154cClass A1H and are also available with or without an internal GPS/SBAS receiver.1.1 GDL 88(D) System FunctionsThe GDL 88 performs the following functions:• UAT transmission (978 MHz)The GDL 88 transmits ADS-B Out data on the 978 MHz (UAT) frequencyto be received by other aircraft, vehicles, and ATC for situationalawareness and traffic management.• UAT reception (ADS-B, ADS-R, TIS-B, and FIS-B) on 978 MHzThe GDL 88 receives ADS-B data transmitted on the UAT link fromother aircraft, vehicles, and ground stations to present a traffic situationalawareness display for use by the flight crew. In addition, the GDL 88receives FIS-B data on the UAT link to provide the flight crew withgraphical and textual weather products.• Mode-S Extended Squitter reception on 1090 MHzThe GDL 88 receives ADS-B data transmitted by aircraft on the 1090 MHzlink to provided a comprehensive situational awareness traffic display foruse by the flight crew.• Correlation of traffic reports from multiple traffic sources, including noheading source installationsThe GDL 88 is capable of interfacing with TCAD/TAS/TCAS I systemsto create and present a “fused” situational awareness display to the flightcrew.• Output of ADS-B and TAS/TCAS I traffic data to an external displayThe GDL 88 is capable of providing a situational awareness traffic displayon compatible displays.• Output of FIS-B weather data to an external displayThe GDL 88 is capable of providing various textual and graphical weather