Chatham Islands Geodetic Datum 1971 (CIGD1971)

The Chatham Islands Geodetic Datum 1971 (CIGD1971) was defined in 1971 by an adjustment of survey observations and measurements undertaken in 1968 and 1970. Its area of applicability is limited to the Chatham Islands.

In 1981 the Chatham Islands Geodetic Datum 1979 (CIGD1979) superseded CIGD1971 as the official geodetic datum in the Chatham Islands.