What is GDA94?
The Geocentric Datum of Australia (usually referred to as GDA94, or just GDA) is a coordinate system for Australia. That is, it’s a system of latitudes and longitudes, or east and north coordinates, which we can use to keep track of locations. GDA is GEOCENTRIC – it is a system of coordinates centred at the centre of the earth’s mass. GDA94 is compatible with modern positioning techniques such as the Global Positioning System (GPS). It supersedes the existing Australian Geodetic Datum 1984 (AGD84) and older coordinate systems. GDA94 is based on a global framework, the IERS Terrestrial Reference Frame (ITRF), but is fixed to a number of reference points in Australia.
