Ikea, we're fine. Getting there or home, we ain't. Apparently my direction skills aren't up to much. I usually just kind of go "yeah turn here" without giving any left or right indication. I know where I'm going (and in fairness, so should he, we've been so many times) but yet I have to direct and usually he gets irate at my directions.
We never argue, especially not on holiday but we spent 2 weeks on a USA road trip and only had one argument where I was trying to direct him out of a car park i'd never been to before, in the dark, where I didn't have my glasses on.