This is a neat device, but GPS would seal the deal for me. I've looked at Tagg (http://www.pettracker.com/ http://www.pettracker.com/) which has it, but it isn

This is a neat device, but GPS would seal the deal for me. I've looked at Tagg (http://www.pettracker.com/ http://www.pettracker.com/) which has it, but it isn't waterproof which a must for my Lab who loves to swim.