Where a normal driver gets confused as to precisley where his satnav is telling him to turn. As a result he slows down to a crawl, thus adopting the driving approach of a person who wears a hat to drive. Which fucks off those people following him beyond belief.
Driver: fuck, where does it mean to go left. Is it here or that road just along there?
Driver's chick: Whatever, get a move on you hat
Driver: Shit, sorry, bit of a hatnav
Driver following slow car: For fucks sake; make your fucking mind up you cunt. What? You going to turn into a field you fucking idiot!!! Fucking hatnav again!