The impact of the implementation of the north American datum of 1983 (NAD 83) on aeronautical navigation
Author(s)/Corporate Author (s)United Nations. Economic Commission for Africa;
United Nations. Economic and Social Council;
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In the U.S latitude and longitude are based on a network of geodetic control points established by the National Geodetic Survey of NOAA. Control point coordinates are determined mathematically based on a single reference point; the NAD 27 was referenced to a control point in Kansas. The Global Positioning System (GPS) now allows satellites to define much more accurately geographic locations in terms of latitude and longitude utilizing an earth centered reference system; the NAD 83 is based on this new technology.