GCalc 2.1 technical specification

GCalc can be used to transform coordinates between the Australian Geodetic Datum (AGD66 or AGD84) and the Geocentric Datum of Australia, 1994 (GDA94). With GCalc, users can perform datum transformations and coordinate conversions using geographic coordinates (ie. Latitude and Longitude) or projection coordinates (ie. Easting, Northing and Zone).