If I plot a map, can the AGD/AMG neatlines be retained while using the GDA/MGA grid?

Yes, however the resulting maps may look better if new GDA neatlines are used. If the old neatlines (map edges) are used, they would be have to be re-labelled with the new GDA94 values, which would be non integer numbers (e.g. 30°30'05.6218" in lieu of 30º30'). Strictly, these values will be different at the top and bottom of a line, since the two grids are at a small angle to each other.

If the neatlines were given the same GDA94 values as they had in AGD (e.g. 30°30'), then the detail covered by the map will appear to shift (by about 200 metres). If the map neatlines were defined along integer values of AMG (in metres), they will have non-integer values on MGA. More.

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