While FindYourCarwithAR is a good idea, it does not seem to work well at close range - like trying to find my car in a busy airport parking lot. Several times I've set the location of my car, outdoors, using the High Accuracy setting. Immediately it shows my car to be about 50 feet in the opposite direction. From a long distance away this may be ok, but a few days later it was no help. I had better luck with my car remote, chirping the horn when hitting the Lock button.
I thought I was doing something wrong, but alas, it turns on the camera for no particular reason at all. It would be smart to take a picture of where the car is, parking space number, nearby sign on a pole or something like that. But to turn on the camera withOUT taking a picture to find the car later is totally useless. I can see better through my own eyes than looking through the iPhone's camera viewer. The camera display in this program does absolutely nothing at all - but waste precious battery power.
If they update FindYourCarwithAR I would be happy to try it again.