// Given a heading (in degrees), bound it from 0 -> 360
void dclBoundHeading(double &hdg);
+// smallest difference between two angles in degrees
+// difference is negative if a1 > a2 and positive if a2 > a1
+double GetAngleDiff_deg( const double &a1, const double &a2);
+
/*******************************
*
****************/
// Given a Point3D (lon/lat/elev) and an FGRunway struct, determine if the point lies on the runway
-bool OnRunway(Point3D pt, FGRunway* rwy);
+bool OnRunway(Point3D pt, const FGRunway& rwy);