Admittedly only used by amateur radio operators, the Maidenhead grid system is a convenient way to indicate a location anywhere in the world. Maidenhead is similar to plus codes in that shorter codes can be used to indicate a less-specific region. For example, most of northwest Oregon is contained in CN85, but my city region is CN85nm. Designators down to 10 digits are possible, although only 6 digits are used in practice. As an operator who likes to plan radio trips that revolve around grid locators, this would be a very handy overlay.
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