0 0  Earth assumed spherical with radius = 6,367,470.0 m
1 1  Earth assumed spherical with radius specified by data producer
2 2  Earth assumed oblate spheroid with size as determined by IAU in 1965 (major axis = 6,378,160.0 m, minor axis = 6,356,775.0 m, f = 1/297.0)
3 3  Earth assumed oblate spheroid with major and minor axes specified by data producer
4 4  Earth assumed oblate spheroid as defined in IAG-GRS80 model (major axis = 6,378,137.0 m, minor axis = 6,356,752.314 m, f = 1/298.257222101)
5 5  Earth assumed represented by WGS84 (as used by ICAO since 1998)
6 6  Earth assumed spherical with radius of 6,371,229.0 m
255 255  Missing
