Definition
WGS84 is an Earth-centred, Earth-fixed geodetic datum with an associated ellipsoid, and it is the native reference frame of GPS. It is effectively coincident with ITRS and, for navigational purposes, with ETRS89 in Europe at the metre level. Modern charts are increasingly published on WGS84 or a compatible datum, and a chart that is so referenced carries a note to that effect, allowing satellite positions to be plotted directly without shift.
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