For some reason, on Wednesday this week (after having been out of town for 6 days) I started having magnetic heading offsets (errors) when trying to fly MS FS2002. I always start up using the default MS 737 with avionics on, at Malaga airport in Spain. The heading is right on the money. Then I'd reposition the airplane to, say, EGBB (Birmingham) or ESSA (Stockholm) and find that my mag heading was way off. Yesterday it was off about 35 to 40 degrees; today it is off by 105 degrees. For example, today at EGHH (Bournemouth) on runway 26, the indicated heading is 005 deg. On runway 08, the indicated magnetic heading is 185.I do not have any failures selected in FS2002, and realism is set at easy.I have the PMDG 737 and SSW A310 as add-on airplanes.I'm tearing my hair out (what's left of it). I thought I had it solved yesterday when I de-selected some recently installed scenery and the headings started to be in alignment again. That's not working today.Any advice or suggestions appreciated.FS2002, WinXP Home SP1, 128 mb Radeon Pro 9700, 1 GB memory, P-4 2.6 GHz.ThxBill

Bump!!ThxBill S.

Check out this thread. It sounds similar.http://forums.avsim.net/dcboard.php?az=sho...id=167963&page=

Interesting...I just started getting an error when I start FS2002..."FS2002 cannot read mag var data, so all mag var will be set as 0.0".Never had this before, and the .bgl scan didn't show any bad files.I'm not sure how mag var gets written into FS2002, and haven't made any significant changes (or even really used it) lately.Any thoughts?regards,chris conklin