Nice idea, and I'm sure there are a bunch of people keeping an eye on it, but I don't think it's going to work in practice with currently-available technology.

Nice idea, and I'm sure there are a bunch of people keeping an eye on it, but I don't think it's going to work in practice with currently-available technology. The smallest GPS module I've seen while looking is the Micro Hornet (http://www.origingps.com/?post_type=products&p=78 http://www.origingps.com/?post_type=products&p=78) and that's still fairly chunky at ~6mL - and that's without cell radio, battery etc. So a good idea, but probably not practical with COTS technology yet.