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All I can tell you as others have found the same problem, the disks are lacking when it comes to updates. There are also errors on them and even at times they give you directions when you are in the middle of a turn, NOT before the turn. You need to watch the road direction signs very carefully and NOT always listen to the voice directions. The system is not very flexible when you do not follow directions, sometimes refuses to recalculate. NAV better than nothing, but at times not much more!
