Geocaching is an outdoor recreational activity where participants use a Global Positioning System (GPS), you then hide containers and others find them by using their GPS, it's called "geocaches" or "caches", people all over the world do it.
If you watch this short video it explains what it's all about.
[video=youtube_share;-4VFeYZTTYs]http://youtu.be/-4VFeYZTTYs[/video]
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