It works when you have a signal. I've been saying that for a few years now.

That's why I programmed my "navigraphic" app to send a "Need Help" email that includes your lat/long. It's why it overlays your position on a weather radar map. Those two features could save your butt, if you have a signal.

I just released the upgrade to my ezInvoice app yesterday so pretty soon I'll have some time to do some more work on that navigraphic app (the weather forecast doesn't work), but since it's free and doesn't weigh anything it's worth bookmarking with your smart phone's web browser now. Better to have it than not.