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The Maidenhead Locator System divides the Earth into a grid of 324 large fields, each subdivided into 100 squares identified by a combination of letters and numbers like FN31. This system was adopted by ham radio operators in 1980 as a compact way to communicate precise locations, and it is especially popular in VHF/UHF contesting and satellite work. Collecting confirmed contacts from many different grid squares is a popular achievement challenge in the amateur radio (Deals) community.
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