If I may take up your kind offer of help? The nav.dat file shows up ok in Wolfgang's gliders. When I'm at my home base, Lilydale airfield in Victoria, it tells me I'm 337 miles from Albert, which Google in turn tells me is in NSW Oz. Great. But clicking around, I can only raise Albert and Moree. If I click on 'Task - yes' I get a CTD.
Could you let me have a bit more info on the nav.dat content? And I'm wondering whether it should be used with the FSX default 808 rather than Wolfgang's crowd?