Garmin G3X Pilot’s Guide190-01115-00 Rev. J 241Hazard AvoidanceSystemOverviewFlightInstruments EISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeaturesIntegratedAutopilot Annun/Alerts Appendix IndexDATA LINK TRAFFIC (GDL 39) (OPTIONAL)The GDL 39 is a receive-only data link radio with on-board GPS, 978 MHz (UniversalAccess 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, andTIS-B traffic information), and weather (Flight Information Service-Broadcast (FIS-B))information to the G3X system through an RS-232 serial connection.ADS-B (Automatic Dependent Surveillance-Broadcast) is a surveillance technologydeployed across the United States as the cornerstone of the FAA’s Next Generation AirTransportation System (NextGen). ADS-B enables improved surveillance services, bothair-to-air and air-to-ground, especially in areas where radar is ineffective due to terrainor where it is impractical or cost prohibitive. Initial applications of air-to-air ADS-B arefor “advisory” use only, enhancing a pilot’s visual acquisition of other nearby ADS-Bequipped aircraft either when airborne or on the airport surface.18,000 FT10,000 FTGPSRADAR ATC1090 ESUATRADARCompositeADS-BGroundStationMode A/C1090 ES1090 ESUAT UATUATADS-B SystemFor the purpose of distinguishing between levels of ADS-B service, there are threeclassifications of aircraft or system capability; ADS-B In, ADS-B Out, and ADS-Bparticipating. ADS-B In refers to the capability to receive ADS-B information. ADS-BOut refers to the capability to transmit ADS-B information. ADS-B participating refers
