I have one but don't use it. I use my awesome sense of direction to guide me.

The last time I used one was when my wife and I went to Melbourne several years ago and while we were on a major road the GPS had us out in some paddock.

As for the 12v socket. That is what they are known as now. To discourage smoking a lot of car companys no longer put cigarette lighters in cars but when you purchase a new car you can buy a cigarette lighter as an accesory. I was actually surprised during my time in the industry how few I sold.