Why don the MGA grid coordinates use a different false origin to that used by the existing AMG grid coordinates, so that the difference will be obvious?
he values for the false easting and false northing are defined as part of the Universal Transverse Mercator projection. While different false origin values could be used, the resulting grid coordinates would no longer be Universal Transverse Mercator coordinates, and would not be globally compatible/icsm defeating one of the principal aims of the GDA.
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