Left or right: A third way

Satellite navigation is said to lower the level of stress for couples travelling together by car. The last time I drove a rental car with my ex-girlfriend, we had no argument about the directions (she was a fairly good navigator), but an argument about satellite navigation. I got enthusiastic about the idea since I hate getting lost and would fancy a nice voice telling me where to go without a hint of a doubt. In return, my ex pretended that she wouldn't like to have one since she likes reading maps so much. What bad faith. As I said, ex-girlfriend.