Garmin GDL 88 Weather Radio User Manual


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3-3
190-01122-03 Rev. A
GDL 88 ADS-B Transceiver Pilot’s Guide
3.4 Anonymous Mode
TheGDL88providesanAnonymousModewhichbroadcastsarandomized
ICAOaddressintheADS-BOutmessage.TheAnonymousMode,whenarmed,
willreplacetheFlightIDwithatemporaryrandomizednumberforprivacywhile
thepositioninformationwillstillbeprovided.Thisrandomizedaddressallows
the ADS-B Out message to not be tied to a specic aircraft,much like a VFR
squawkcode of 1200 on a Mode A or Mode C transponder. The mode is armed
via a switch in the cockpit or via a control on the display integrated with the GDL
88.When a VFRsquawk ispresent inthe transponder andanonymous mode
is selected, then the GDL 88 operates in anonymous mode and no identifying
information is provided in the ADS-B Out message. This mode will persist until
thesquawkcodeischangedortheAnonymousModecontrolisturnedtotheoff
state.
Anonymous Mode is not available when installed in an aircraft with a Mode S
transponder.
3.5 Air/Ground Determination
Ifaweightonwheelsorsquatswitchisinstalled,theGDL88willusethat
inputtodetermineair/groundstatus.Ifnot,thenair/groundstatusispurelybased
on GPS-derived information.
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