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Cache: a hiding place, esp. one in the ground, for ammunition, food, treasures, etc. In geocaching, the cache stores a log book where visitors can sign in and leave comments. Sometimes the cache will hold other items like coins, cards, pictures, etc that pertain to the site or the person who visits it. Plastic buckets, tennis ball containers, paint cans, CD cases, are typical geocache containers.

Geocaching: a type of scavenger hunt for waterproof containers bearing treasure using the containers' exact geographic coordinates and Global Positioning System devices

GPS: a navigational system involving satellites and computers that can determine the latitude and longitude of a receiver on Earth by computing the time difference for signals from different satellites to reach the receiver. In geocaching, people use handheld devices to locate the caches.

Logbook: a book or record kept in a cache. Visitors sign the logbook with their names, dates, and comments. 

Travel Bug: a trackable item placed inside a cache and registered on a geocaching website. Visitors to the site take the bug with them to another geocache site. Visitors tell where they took the bug by entering data or pictures on a website. The person who created the bug can check the geocaching website to see where the bug has been and where it is going.

cache. (n.d.). Dictionary.com Unabridged (v 1.1). Retrieved May 29, 2008, from Dictionary.com website: http://dictionary.reference.com/browse/cache

geocaching. (n.d.). Webster's New Millennium™ Dictionary of English, Preview Edition (v 0.9.7). Retrieved May 29, 2008, from Dictionary.com website: http://dictionary.reference.com/browse/geocaching

GPS. (n.d.). WordNet® 3.0. Retrieved May 29, 2008, from Dictionary.com website: http://dictionary.reference.com/browse/GPS