OnStar is pretty cool. Just push the button, and give them the address you are heading to. It will find you on the route, and download directions to your car. It will tell, and show you on the screen, to turn left ahead. If you miss the turn, it'll say "when you return to the route, we will continue with your directions". And if I wreck, OnStar can get emergency personnel out to me. I have had some health issues, so I never know when I need it. And if the car is stolen, it has a GPS that OnStar uses to tell where the car is. AND MY FAVORITE: If I lock my keys in the car, I can call onstar, and they will unlock the car for me!! That saves ANOTHER one of those calls home.