Nav scale is not correct
 

My Nav went out about a month ago. I took it to the dealer and they replaced it with a brand new MK4. I got it back and the scale under a mile was in meters, fixed that with navcoder. But it also was showing the wrong scale. I would have it set at 1 mile and I could see at least 10 miles out. 400 feet was like 1 mile. I put it in my brothers 530i and it still did it. The dealer also had it programed for the UK region, I changed that to US region with the navcoder. I called the dealer and told them about it and they were going to ask a tech about it. Any thoughts of how to fix this with out taking it back to the dealer? Thanks