the coordinate system of the gps system is the based on the center of the earth you retard. its all open source math and agreed to by the whole world.    _geodetic_system the equations are based on three spatial coordinates x,y,z where 0,0,0 is the center of earth. why don't you actually read the material before you open your retarded mouth and speak about things you know nothing about. the math being done in realtime when anyone uses their phone accounts for both radii of earth's ellipsoid model. if it didn't then people more north would be underground according to their gps. there is quite literally nothing flat about gps. just kys
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