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A GPS survey (using a handheld GPS receiver) provided the following
MGA94 (UTM) coordinates for a known control point:
MGA94: Zone 50, Easting: 404,684.20 m, Northing: 6,459,255.30 m
Unfortunately the coordinates of the control point are only given with
respect to the old mapping grid AMG84 (based on the datum AGD84):
AMG84: Zone 50, Easting: 404,540.00 m, Northing: 6,459,110.00 m