How will GDA affect legal boundaries?
Legal boundaries are generally defined by physical features or marks on the ground. These boundaries will not change, though the coordinates of them may. Some boundaries may have been defined by coordinates in terms of the AGD (or another system). These boundaries too will not change, although the coordinates will be different when converted to GDA. Some boundaries were defined by coordinates without reference to a coordinate system. In these cases the physical location has always been uncertain and this predicament will continue until the boundaries are referenced to a coordinate system.