Not sure if there's an app like this. I have an app that if I remember to make a waypoint, later I can open the app and it gives me an arrow and how far my car is. But, I just got to thinking my phone is connected to my car with bluetooth. Seems like there would be an app that would recognize that and then when the bluetooth to my car is lost, that means I turned off my car so it would automatically save that waypoint so I can find my way back. Does such an app exist?