John A. Gallas
> 
> I was just wondering if the subroutine
> SGRoute.distance_off_route() calculates accurate
> results (or even reasonably usable results for
> navigation in fgfs) for waypoints on a wgs84 system. 
> I've run some tests and it seems okay, but I'm no
> expert - can someone verify this?

This is a *much* better approximation
http://williams.best.vwh.net/avform.htm#XTE

Norman

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