Coordinate Conversion functions in CAD / GIS packages technically perform 2 functions: a parametric conversion (converting from one set of units & projection to another) and a grid shift.
Converting coordinates from GDA94 to GDA2020, for example, will result in a "null" transform as there is no parametric conversion (GDA94 & GDA2020 are coordinate systems with easting and northings). However, there is a slight shift in grid coordinates between these two coordinate systems, which is defined as a grid shift.
Users will need to download a grid shift file from a GIS database to accommodate file conversions from coordinate systems which have a null parametric transformation. Grid shift files can be specified and used in the Conversion Setup > Conversion Method form as seen in the image below.
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