The North American Datum is the official datum used for the primary geodetic network in North America. In the fields of cartography and land-use there are currently two North American Datums in use: the North American Datum of 1927 (NAD27) and the North American Datum of 1983 (NAD83). Both are geodetic reference systems, but are based on different measurements.
Read more about North American Datum: North American Datum of 1927, North American Datum of 1983, Comparisons Between NAD27 and NAD83, North American Datum 1983 and WGS84, Latest Version of North American Datum, See Also
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