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