Enter lat/lon of points, select distance units and earth model and click "compute". Lat/lons may be entered in DD.DD, DD:MM.MM or DD:MM:SS.SS formats.
Enter lat/lon of initial point, true course and distance. Select distance units and earth model and click "compute". Lat/lons may be entered in DD.DD, DD:MM.MM or DD:MM:SS.SS formats.
Enter "user defined" spheroid parameters here:
5/16/98 Changed the great circle radial and distance algorithm to one valid for unlimited distances. Previous was only valid for ranges up to one quarter of the earth's circumference in longitude. Note that the Vicenty algorithm for (ellipsoidal) course and distance may fail to converge correctly, or at all, if the final point is within 37' of arc of the antipodes of the first point.
5/12/98 Eccentricity of NAD27 (Clarke1866) ellipsoid obtained from my reference "Coordinate Systems and Map Projections" by D. H. Maling was in error. 1/f changed from 298.97866982 to 294.9786982138
11/9/97 Fixed bug where if the output lat/lon was DD 6.MMMM (ie 6 minutes), the result was incorrectly rounded up to the next degree.3/4/97 Fixed bug where deg/minute entries 08 or 09 would be (mis)read in octal!