Had a great conversation with an OnStar advisor today! I had asked if it was possible to get directions sent to my iphone sat nav if I had it connected to car play! I was told no, but he did say he was able to give me verbal directions if I ever get lost and need to find somewhere. And yes it could end up with a long conversation with an advisor, but still a great service they provide. So if you didn't order nav with your car, but you are lost, your OnStar advisor can see where you are by using your gps locator, can guide you to your destination!