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190-00356-37 Rev A
Anonymous (ANON) Mode
The Anonymous Mode, when armed, will replace the Flight ID with a temporary
randomized number for privacy while the position information will still be pro-
vided. The call sign will be sent as “VFR.” To enable Anonymous Mode, the Squawk
Code on the installed transponder must be set to the VFR code (based on the GDL
88 configuration) and the Anonymous Mode must be armed. Anonymous mode is
not available when the GDL88(D) is connected to a Mode S transponder.
1. Turn the large knobtoselectAUXgroup.
2. Turnthesmall knobtoselecttheGDL88Statuspage.
3. PressMENU to display the menu.
4. Turn the small or large right knobtohighlightthedesiredchoice
and then press ENT.
Failure Response
Errors indicated by a “FAILED” message on the screen prevent continued use
of the GDL 88 Series unit. If the GDL 88 is configured (not integrated with TCAD/
TCAS system) and reports an invalid heading, invalid track, and valid GPS position,
“UNAVAIL” will be displayed in the center of the page. See the GDL 88 Status page
for information on Failure Response.
GDL 88 STATUS page, lists some of the problems with the GDL 88,
that might cause the failure.
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