http://news.bbc.co.uk/1/hi/magazine/6165070.stm
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As soon as I started reading that article, I asked the same question that the author asks at the end: What happens when you lose the loc8tor?
The real solution will be in the future an implant... unless you, like me, lose your head often.
The simple solution - have it embeded in a wall of the home (the second one) and use this stationary to locate the first one (mobile)
The article mentions "a fine tradition" of metal detectors and treasure maps for finding things with technology, but it omits a far more important use (which incidentally uses devices extremely similar to this "Loc8tor"): finding avalanche victims.
It is highly recommended to all mountaineers and off-track skiers that they carry a "Lawinenpiepserl" (the Austrian slang word for it) at all times. These act as senders in their default setting (obviously with a higher range than the tags of this new thing) and all of them can be set to receive, too. This way, anyone in a group of people can start searching immediately.
"And let us not forget... that the human race with technology, is like an alchoholist with a barrel of wine"