Turning on the Tom Tom

Autonomy suggests individual decision making. If it is abstract (controlled and theoretical), it works very well. In reality, our decisions impact each other in complex, ambiguous, and random ways. How do you handle joint decisions when a path is shared? Tom-Toms are one form of GPS. My wife’s name is Gemma John. We were once driving through an area in Fulham across the river from where I lived in Putney. The GPS was telling us to go one way but Gem was pretty sure we should go another way. So I turned off the Tom-Tom and listened to the Gemma John. Even in an area I knew reasonably well, I had got to the point where I had to decide whether the GPS was doing a better job than me (when in doubt), and whether to trust it or not. At what point do you delegate your decision making when you are in an area you do not understand? Or when someone (or something) can make better decisions than you, even if you believe you have a decent understanding?