That does get to an issue I was wondering about: how long does it remember and does it associate each ping with a geo tag?

We live the mountains with poor coverage and a dog who at one time was a wizard at escaping and getting lost.

Yet we do have people all around, so I think the iphone solution would work, even if it was delayed. At least I would have an idea of where to start searching. I bought every lower than professional level device and they all just didn't work here.