The Geocentric Datum of Australia 2020 (GDA2020) is a geocentric (earth-centred) coordinate reference system that is Australia’s new official national datum. GDA2020 will eventually supersede the GDA94 datum and older coordinate systems.
The changes are needed because national and global location information systems operate differently, and they are diverging. When GDA94 was adopted in 2000, GPS locations were ‘accurate’ to 100 metres. But by 2020, Australia will have moved 1.8 metres north-east of where it was in 1994, and many of us will own devices that pinpoint places as small as, well, a smartphone.
For Further Info: https://www.icsm.gov.au/what-we-do/geocentric-datum-australia