GeodSolve performs geodesic calculations for the WGS84 ellipsoid. The shortest path between two points on the ellipsoid at (lat1, lon1) and (lat2, lon2) is called the geodesic; its length is s12 and the geodesic from point 1 to point 2 has azimuths azi1 and azi2 at the two end points. There are two standard geodesic problems:
16.776 -3.009 16d47' -3d1' W3°0'34" N16°46'33" 3:0:34W 16:46:33NAzimuths are given in degress clockwise from north. The distance s12 is in meters.
GeodSolve is accurate to about 15 nm and gives solutions for the inverse problem for any pair of points. Many other geodesic calculators (based in Vincenty's method) fail for some inputs; for example, the NGS online inverse geodesic calculator sometimes fails to terminate. (NGS has removed its inverse geodesic calculator in order to address this problem.)