ok, I was thinking sense there is a nav/gps on some headunits...Is there way to use is as a tracker or lojack?? You know to see where or sons, daughters, or spuse has been or where they're going...How fast or how many miles they have put on the car...Track them by using your home computer....Is there anything like that?? anyone know???

dei makes a piece that does does exactly that. and you dont need a navi for it to work. its all self contained