Graeme_77 Posted January 8, 2022 Report Share Posted January 8, 2022 The avionics will look at the X-Plane Date, when checking nav data validity. If you regularly load X-Plane to a date or month that's different to the nav data you have, then look for this option in the Challenger 650 menu, User Settings, Miscellaneous. This will force the avionics to compare nav data with the real date, not the X-Plane date. 3 Link to comment Share on other sites More sharing options...
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