all very well if you know where you are going, you don't need a satnav then, but if you are out in the middle of France looking in a book at where you are going to find a site that you havnt got a clue as to where it is ,is a different matter and you are trusting a satnav, as it happened yesterday it was taking us right past the site and said we had 20 km to go but we were looking for it by the other directions in the book