Example 1: A and B to delta | Solution | Example 2: B and delta to C | Example 3: ECEF-vector to geodetic latitude | Example 4: Geodetic latitude to ECEF-vector | Example 5: Surface distance | Spherical model | Elliptical model (WGS-84 ellipsoid) | Example 6: Interpolated position | Example 7: Mean position (center/midpoint) | Example 8: A and azimuth/distance to B | Example 9: Intersection of two paths | Example 10: Cross track distance (cross track error) | Example 11: Cross track intersection | References