`  :::::The calculator here http://sps.unavco.org/geoid/ says: ::::::Latitude = 0° N = 0° 0' 0`` N  ::::::Longitude = 133° E = 133° 0' 0`` E  ::::::GPS ellipsoidal height = 0 (meters)  ::::::Geoid height = 73.762 (meters)  :::::Unhappily, the calculator says 73.762 instead of +72.81. The discrepancy may suggest that, as when seeking a value for _the_ polar radius, there may not be _one_ geoid which is ``correct``. But the calculator reinforces the notion that maximum geoid radius is not at 0°S 121.83°E. With enough persistence, one might this (or a similar) calculator to find a precise location where geoid radius is maximum. -   `