okay, well, i did the 737 course at riddle in the sim and am basically using the same funtions to edit the fms in pmdg 737ng.Anyways, for some reason on my system it isn't taking magnetic deviation into account. The central states..i.e. illinois, indiana and ohio work okay, but out in cali or east my fms is not tracking straight, it tracks anywhere between 10 and 15' off so basically im in a gradual turn the entire route. any suggestions on fixing this issue????MK

First off, what's your name? Forum rules dictate signing your real name in your posts.Secondly:You must have re-installed FS by copying it from folder to folder, or you have likely re-installed Windows and left FS alone, right? This would cause the registry settings for FlightSim to be lost, so the app cannot find where your magvar file is located (magdec.bgl).If you're comfortable going into the registry, set up the FS path properly. If not, you need to reinstall your FlightSimulator.Best,