How will GDA94 affect maps?
The detail on maps will appear to shift, relative to the map grid. The magnitude of this shift depends on the map scale (divide 200 metres by the map scale to assess the effect). At 1:1,000,000 the shift is barely significant at 0.2 mm. It is 0.8 mm on a 1:250,000 scale map and 200 mm at 1:1000 scale, as might appear on a site map of a facility – the facility could disappear off the sheet if the map was redrawn with the neatlines set to the same numeric values, but on the new datum.
