<Dl> <Dt> World Geodetic System 1984 (WGS 84) </Dt> </Dl> <Dt> World Geodetic System 1984 (WGS 84) </Dt> <P> The Global Positioning System (GPS) uses the World Geodetic System 1984 (WGS 84) to determine the location of a point near the surface of the Earth . </P> <Table> WGS 84 Defining Parameters <Tr> <Th> Parameter </Th> <Th> Notation </Th> <Th> Value </Th> </Tr> <Tr> <Td> semi-major axis </Td> <Td> </Td> <Td> 6 378 137.0 m </Td> </Tr> <Tr> <Td> Reciprocal of flattening </Td> <Td> 1 / f </Td> <Td> 298.257 223 563 </Td> </Tr> </Table>

Where is the wgs84 datum used for measurements