The GPS instrument does this in the same way as you suggest (as do most real gps devices), take a look at the gps.cxx source file to see the details. I believe the actual formula can be found someplace in SimGear. But if you are just looking for the true flight path the beforementioned GPS instrument provides this. Take a look at /instruments/gps/... in the propertytree.
Oh yeah, I'd forgotten that I'd written that module.
All the best,
David
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