Mitch51

Recently purchased a Lexus 430 LS. I noticed the GPS did not report my location 100% accurately. I was parked in my garage and it had me listed about 3 doors down. How do you calibrate the equipment? The cursor seems to be in the proper location when moving down the road. Someone suggested to get new version for the navigation. When I install the new disk it will not read the new disk. I returned the disk thinking it may be defective or fake. The old owner delivered a disk to dealer that she had but once again it did not read. Is there a trick or certain procedure to follow?

Thannks,
Mitch