It's called bft *blue force tracker*. Why have one of these for? Theres no way this can be as secure. Granted smaller, easier to carry, but not secure I don't care what they say. And um can't cell phones be traced.. Just saying. That's why it's also why the military don't like using regular gps, and use military gps instead. As it's far more secure. I don't see this ever taking off.
Now if it had military hardware, small like an ipod but much tougher. A self-destruct it's own satellite communications then this would be good. But in an off the shelf ipod.. um no thank you.