WGS 84. The World Geodetic System or WSG assumes a coordinate origin at the center of the mass of the earth. The last revision was made in 1984 and is referred to as WSG84. It is the reference system being used by the global positioning system or GPS which has now assumed universal usage for helping people to find their way to their destinations or to pinpoint their locations. As per this the ellipsoidal height of Mount Everest is 8823.51, whereas the Geoidal height is 8846.10 meters. The latitude and longitude positions remain the same.