Hey all, I am trying to calibrate my scanned rooftop maps into PC oziexplorer. I am almost there but can't hit the nail on the head.

I've use WGS84 as the Map Datum. Map projection as UTM.
On the Point 1 etc, zone is 55 and the correct UTM Coordinates and set the N/S to S.
If I set 2 points I am about 100 metres out but if I set 4 points we end up km out.

I use basecamp(Aust topo map) to get a waypoint then export the gpx and import it into ozi.I just can't get the waypoints to match up?

If anyone can help tell me what is going wrong, I would appreciate the help.