Garmin G3X Pilot’s Guide 190-01115-00 Rev. J202Hazard AvoidanceSystemOverviewFlightInstrumentsEISCNSInterfaceGPSNavigationFlightPlanningHazardAvoidanceAdditionalFeaturesIntegratedAutopilotAnnun/AlertsAppendixIndexDATA LINK WEATHER (FIS-B)The GDL 39 is a receive-only data link radio with on-board GPS, 978 MHz (the 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, and TIS-B trafficinformation), and weather (Flight Information Service-Broadcast (FIS-B)) information to theG3X system through an RS-232 serial connection. As a UAT receiver, the GDL 39 canreceive and, when connected to the G3X, display Flight Information Service-Broadcast(FIS-B) weather products as well as traffic.FIS-B is a subscription-free weather service that is broadcast by Ground Based Transceivers(GBTs) over the 978 MHz UAT frequency band as part of the FAA’s Next Generation AirTransportation System (NextGen). To receive FIS-B weather information, the GDL 39 must bewithin range and line-of-sight of an operating GBT. Reception may be affected by altitude,terrain, and other factors. GDL 39-supported FIS-B weather products include METARs,TAFs, NEXRAD (Regional and CONUS (Combined)), AIRMETs, SIGMETs, PIREPs, and Windsand Temperatures Aloft. Other products include NOTAMs and TFRs. Only one display in amultiply-display installation may be configured to show FIS-B weather information. It isrecommended that the GDL 39 be connected to the MFD in a multiple-display system.Switching Weather Sources:1) Press the MENU Key twice to display the Main Menu.2) Turn or move the FMS Joystick to highlight ‘System Setup...’ and press theENT Key.3) Turn or move the FMS Joystick to highlight ‘WEATHER’.4) Press the ENT Key.5) Turn or move the FMS Joystick to select the desired weather source (AUTO,XM, or GDL FIS-B). The default is ‘AUTO’ which will use XM over GDL FIS-Bif both are available.6) Press the FMS Joystick, the CLR Key, or the EXIT Softkey to return to theprevious page.Or1) From the Weather Page press SETUP Softkey.2) Turn or move the FMS Joystick to select the desired weather source (AUTO,XM, or GDL FIS-B). The default is ‘AUTO’ which will use XM over GDL FIS-Bif both are available.
