2-22 GPS 175/GNX 375 Pilot’s Guide 190-02207-02 Rev. BGet Started2.14.1 ADS-B KeyFEATURE LIMITATIONS• Functionality dependent upon GDL 88 configurationDepending on the configuration of your GDL 88, tapping the ADS-B key:• Reports GDL 88 altitude reporting statusOR• Allows on/off control of the GDL 88’s altitude reporting function2.14.2 Enabling Anonymous ModeFEATURE LIMITATIONS• Availability dependent on GDL 88 configurationDuring anonymous mode, the unit replaces identifying information in the ADS-B Outmessage with a temporary randomized number for privacy while providing positioninformation. Instead of a flight ID, the unit transmits the call sign "VFR."“ALT” indicates that the unit isin altitude reporting mode.This indication corresponds tothe function status annunciationon the control panel.Squawk Code(as reported by GDL 88)TransponderMode (ALT)ActiveTransponderTap ADS-B > Anonymous.The key label changes from “Off” to “Armed.”Tapping Anonymous again toggles the mode off.
