Geocaching is an outdoor recreational activity, in which
participants use a Global Positioning System (GPS) receiver or mobile
device and other navigational techniques to hide and seek containers,
called "geocaches" or "caches", at specific locations marked by
coordinates all over the world.
A typical cache is a small waterproof container containing a logbook and
sometimes a pen or pencil. The geocacher signs the log with their
established code name and dates it, in order to prove that they found
the cache. After signing the log, the cache must be placed back exactly
where the person found it.
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