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This datum will be fixed to the earth and will model the locations of reference points and their movement over time by maintaining full alignment to the International Terrestrial Reference Frame (ITRF).
NOTE: GDA2020 will still be available for users who do not need a time-dependent reference frame.
The Intergovernmental Committee on Surveying and Mapping (ICSM) is responsible for modernising Australia's datum to ensure that all Australians can take advantage of the increased accuracy that current and future positioning and navigation technologies provide.
Geoscience Australia will also be assisting Australian Government agencies and spatial software providers to adopt the new datum.
Like GDA94, this datum is fixed to the Australian continent, where coordinates do not change with time.
As a consequence, coordinates from GNSS such as GPS, will be offset by approximately 20 cm from GDA2020 in 2017; however, these coordinates will converge by 2020.
In this case, the Conformal and Distortion grid should be used to transform to GDA2020 coordinates.
If in doubt, contact your state or territory land survey authority.