Don't seem to have nav data anymore for on board computer. When I try to set up waypoints the computer doesn't recognize any. Any help appreciated.Thanks

If you're tazlking about the PMDG 747-400 you can get updated airac's here http://www.navigraph.com/www/fmsdata.asp you will have to purchase credits, but it's not expensive. I think it's 10 euros for 100 credits, which will get you 5 airac cycles.Dave F.

sorry, your going to have to provide more detail???Rob