Hi all,Can anyone help me with the formula Fly 2 uses to calculate Magnetic Variation? Grateful for any help.Cheers,Danny VickersAustralian Fly! Group

In the SYSTEM pod, there's a file MAGVAR.DAT which contains the magetic variation data for the WMM-95 model. A web search for WMM-95 should bring up a bunch of information. You can also take a look at avdbtools, a GPL program which can make sense of the data file. You should be able to borrow the code you need from it. Here's the link:http://www.doclib.org/Linux/science/cartog.../doc/guide.html-Frank

Thanks Frank,Found the source code from NIMA :-kewl I can feel some AIRACs coming on :-)Cheers,Danny VickersAustralian Fly! Group