Even just on short local journeys that he should know as he drives them often enough he insists on using it. He is completely and utterly reliant on it and it drives me nuts!
We're currently driving back South after a weekend away and the journey is pretty simple M1, M25, M3 then home. I fell asleep (up a lot of the night with DS, hence why I'm not driving) and wake up to find we've missed the M25 junction and we are merrily driving towards Brent Cross. Apparently he didn't see the M25 junction and it's not his fault because we didn't have the satnav on
.
We've now added another half hour on to an already long journey!