Modern GPS receivers have a grid implemented in their software by which they obtain, from the current position, the height of the geoid (e.g. the EGM-96 geoid) over the World Geodetic System (WGS) ellipsoid.
Panerima GPS modern madue kisi sane kaimplementasiang saking perangkat lunak ipunne sane teken ia ipun ngamolihang, saking posisi dugas niki, kategehan geoid (umpamine geoid EGM-96) ring duur ellipsoid Sistem Geodesi Dunia (WGS).