A wonderful invention
What a silly question! They will soon be fitted to every type of vehicle as standard. It is an extraordinary device and if you have not benefited from it you are living a very sheltered life; Try, for instance, finding an address in the middle of a large town riddled with one way streets, in heavy traffic in poor weather! (Lyon for instance.) (Even worse if your wife is navigating!=Why DO YOU want a sat nav? Do YOU NEED one?
I can think of only few reasons for them e.g fuel station when in the middle of nowhere with low fuel. Far to many people rely on them even for going to the corner shop.

