The Maidenhead Locator System reference article from the English Wikipedia on 24-Apr-2004
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Maidenhead Locator System

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The Maidenhead Locator System is a system for locating positions on the globe commonly used by amateur radio enthusiasts or "hams". It is named after Maidenhead, the town outside London where it was first conceived by a meeting of European VHF managers in 1980. A Maidenhead grid square measures 1° latitude by 2° longitude and measures about 70 × 100 miles in the continental USA. The American Radio Relay League uses the six digit form of the Maidenhead Locator System for its 10-GHz contest.

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