Sat navs are fundamentally stupid, they do not possess intelligence - I used to think that they were great, but after a several trips to France with a friend I have come to the conclusion that the human brain is a far superior navigational computer.
Matey had a Tom Tom and I had a Garmin and no matter how hard we tried they would never give us the same route (obvious really if you know about computers and electronics) - this caused all sorts of tension and stress as I want to go one way and he another.
Matey is non-technical and unlike me didn't really understand the reasons why they were different, it really did his head in

.
Maps and the brain working in conjunction are far superior - blindly following a sat nav means that you don't bother to actually work out where you are (bit like a girl

) and as soon as there is a problem you are truly lost.