Definitions for "NAD 27"
Regional horizontal coordinate system used throughout the U.S. until 1986 with the origin at station MEADS RANCH.
North American Datum 1927. Latitude and Longitude unit, used on some older maps.
North American Datum of 1927. Older and obsolete horzontal datum of North America. NAD 27 depends upon an early approximation of the shape of the earth, known as the clarke Spheriod of 1866, designed to fit only the shape of the conterminous United States, and utilizing a specific Earth surface coordinate pair as its center of reference.