Garmin GDL 88 Weather Radio User Manual


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1-1
190-01122-03 Rev. A
GDL 88 ADS-B Transceiver Pilot’s Guide
1 INTRODUCTION
The GDL 88 is a remotely mounted ADS-B transceiver. There are four models
of the GDL 88(D). Models with a single bottom mounted UAT antenna meet TSO
C154c 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 C154c
Class A1H and are also available with or without an internal GPS/SBAS receiver.
1.1 GDL 88(D) System Functions
The GDL 88 performs the following functions:
• UATtransmission(978MHz)
 TheGDL88transmitsADS-BOutdataonthe978MHz(UAT)frequency
to be received by other aircraft, vehicles, and ATC for situational
awareness and traffic management.
• UATreception(ADS-B,ADS-R,TIS-B,andFIS-B)on978MHz
The GDL 88 receives ADS-B data transmitted on the UAT link from
other aircraft, vehicles, and ground stations to present a traffic situational
awarenessdisplayforusebytheightcrew.Inaddition,theGDL88
receivesFIS-BdataontheUATlinktoprovidetheightcrewwith
graphical and textual weather products.
• Mode-SExtendedSquitterreceptionon1090MHz
 TheGDL88receivesADS-Bdatatransmittedbyaircraftonthe1090MHz
link to provided a comprehensive situational awareness traffic display for
use by the flight crew.
• Correlationoftrafcreportsfrommultipletrafcsources,includingno
heading source installations
The GDL 88 is capable of interfacing with TCAD/TAS/TCASIsystems
to create and present a “fused” situational awareness display to the flight
crew.
• OutputofADS-BandTAS/TCASItrafcdatatoanexternaldisplay
The GDL 88 is capable of providing a situational awareness traffic display
on compatible displays.
• OutputofFIS-Bweatherdatatoanexternaldisplay
The GDL 88 is capable of providing various textual and graphical weather
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