I'm going to yell at my ex husband because he's not listening to me and the gps directions.
Why are you upset at him so quickly?
Because he doesn't listen to my advice.
Yelling at him won't solve the problem either. Calmly explain why you are right about the directions and let him make the decision.
I know but I need to yell at him first so that I can be heard.
This might mean a deeper rooted issue.  It would be good to speak calmly and respectfully.  In the long run if you do this, you may find better overall communication.