Does anyone have a formula handy for calculating the flight path of an
aircraft in true degrees (direction of travel as opposed to the airframe
heading)? My guess is that it'd be a matter of doing something with the
lon/lat from the previous frame. Maybe there's something simpler with the
current FDM output in FlightGear?
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.
-- Roy Vegard Ovesen
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