Kate, I somehow expected you to say that.
*ducks*
I don't drive myself, but I do know that satnav's can be notoriously unreliable... for one thing according to Panomania's satnav, I live in a black hole in the centre of Norwich. And on a recent occasion I was stopped by a van driver, who was convinced he was in a particular street in NR2, whereas he was well over a mile away in NR1. He was almost trying to convince me that I don't know my own city. He was a scouser BTW.