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+gridcal -- compute the great-circle distance between two grid locators
+======================================================================
+
+`gridcal` computed the short-path great-circle distance between two grid
+locators. The Grid Locator System divides Earth into a series of
+rectangles identified by a combination of letters and numbers, so that
+the approximate position of a point can be expressed with a short
+identifier like IO91vl.
+