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The Geocentric Datum of Australia (GDA) is a new coordinate system for Australia which is compatible with modern positioning techniques such as the Global Positioning System (GPS). GDA supersedes the existing Australian Geodetic Datum 1966 (AGD66) and Australian Geodetic Datum 1984 (AGD84) coordinate systems. GDA is based on a global framework, the international Terrestrial Reference Frame (ITRF).
