New Scientist: "'We look like prats, but at least we're all prats together". On the one hand, I can see having a cellphone that can locate a person to within a foot or so a real safety boon. On the other, well, can see having a cellphone that can locate a person to within a foot or so a real safety hazard. Like any tool, I suppose it's all in the implementation.

However, I can't help but think of several lurid murder cases in the past which had the doomed victim calling police from, say, a locked trunk asking for help. With one of these things, they'll get it, and fast.