The 'Military Grid Reference System' ('MGRS') is the geocoordinate standard used by 'NATO' militaries for locating points on the earth. The 'MGRS' is derived from the 'Universal Transverse Mercator' ('UTM') grid system and the universal polar stereographic ('UPS') grid system, but uses a different labeling convention. The 'MGRS' is used for the entire earth. Methods are provided to convert 'MGRS' coordinates to and from other coordinate systems.
copied from cf-staging / r-mgrs