Garmin GDL 39/GDL 39R/GDL 39 3D GDL 39 User's Guide - Page 43
Weather, 4.6 Attitude Heading Reference System (AHRS), NEXRAD Conus, NEXRAD Regional, TFR, TAF
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Refer to the attached website for more information on ADS-B: www.garmin.com/adsb 4.5 Weather The GDL 39 will receive the Flight Information Service (FIS-B) that is broadcast on the UAT data link from the FAA ground stations. No subscription fee is required for receiving FIS-B. FIS-B products available from the FAA ground station include NEXRAD Conus, NEXRAD Regional, TFR, TAF, PIREP, NOTAMS, SIGMET/ AIRMET, METAR, and Winds Aloft. See your display device documentation for detailed information about weather products. 4.6 Attitude Heading Reference System (AHRS) This section only applies to the GDL 39 3D units with the AHRS function. The AHRS function starts automatically and will perform leveling adjustments for pitch and tilt angles when the unit is powered on. The AHRS function will not be available until the leveling process has finished. The GDL 39 3D does not have to be perfectly level as the leveling process will compensate for any differences. The connected display device can command the GDL 39 3D to perform the leveling process. The unit needs to be pointed in the direction of flight when placed/mounted. See the Location section (3.3.1). 190-11110-00 Rev. H Garmin GDL 39 Portable ADS-B and GPS Receiver User's Guide 4-5