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Maidenhead Grid Locators

Among Amateur Radio operators, a popular way of describing one's location is to give the 4 or 6-character grid square designation. Each grid square is 1 degree of latitude by 2 degrees of longitude (4-character) or 2.5 by 5 minutes (6 character), and has a unique designation. A variation of this system was first devised in Maidenhead, UK, hence the name.

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