Lined up on 34R at KSEA my DG reads 360, the compass reads 360 and hitting the Shift-Z shows my heading as 360. I've tried hitting thr D key, I don't have "Gyro Drift" checked in FS options. This happens elsewhere, not just Seattle. It seems my FS world is 20-30 degrees off globally. I have downloaded some AI traffic and AFCAD files lately, I tried taking the most recent out but doesn't seem to help. If anyone has any ideas, it would be greatly appreciated.Mike

Try looking for the addon scenery Torres Straits. If you have this scenery installed, find and delete ydni_excl.bgl .There are several posts here and elsewhere about this problem. It seems this one rogue file is disabling magnetic variation.Hope this helps,Todd

Yup, in my case it was a bad AFCAD file for an airport half-way around the world. Start and save a simple saved-flight with a known compass error and located at the end of a runway. Once the saved flight is loaded, with something like a default Baron58 or something with a the default GPS, turn on the GPS map and look at your compass. You have to move the aircraft a few feet for the GPS to orient to current runway direction, then see if your compass and GPS agree. You'll be able to tell quickly if it's still broke becuase your current heading will be off by 20 to 30 degrees from the runway heading. If they don't match, start renaming AFCAD.bgls file to .bak or something. Maybe half the AFCADS at time and start narrowing it down using this half-split troubleshooting method. This is how I determined which AFCAD was diablding magnetic compass readings. Only took an hour or so. Mind you, you have to completely shutdown FS9 after renmaing AFCADS to get FS9 to rebuild the scenery database on each startup and then check the for the compass error. Hope this helps and good luck...Al