1 
WGS84World Geodetic System, 1984. The primary map datum used by GPS. Secondary datums are computed as differences from the WGS 84 standard.

2 
WGS84The mathematical ellipsoid used by GPS since January, 1987.

3 
WGS84"World Geodetic System 1984"; the ECEF spatial coordinate system used by GPS since 22 Jan 1987 (see, for example, "Session 2: World Geodetic System 1984" pp. 67134, in Proce [..]

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