Hello, when I first got my car,I was impressed with the accuracy of the sat nav. Recently however, the accuracy has been quite poor. Occasionally, when looking at the map, the green arrow (me) will be running parallel to the road I'm actually travelling on. More often however, the arrow can be around 30 yards out which makes the system almost useless when going round back streets. I' not expecting it to have the accuracy of a Storm Shadow ALCM however it *used* to be far, far better. Has anybody else come across this or perhaps know a way to get it back on track? Thanks for reading.