What does MGRS mean in Military?

Military grid reference system

The Military Grid Reference System is the geocoordinate standard used by NATO militaries for locating points on the earth. The MGRS is derived from the Universal Transverse Mercator grid system and the Universal Polar Stereographic grid system, but uses a different labeling convention. The MGRS is used for the entire earth. An example of an MGRS coordinate, or grid reference, would be 4QFJ12345678, which consists of three parts: ⁕4Q, ⁕FJ, and ⁕12345678. An MGRS grid reference is a point reference system. When the term 'grid square' is used, it can refer to a square with a side length of 10 km, 1 km, 100 m, 10 m or 1 m, depending on the precision of the coordinates provided. The number of digits in the numerical location must be even: 0, 2, 4, 6, 8 or 10, depending on the desired precision. When changing precision levels, it is important to truncate rather than round the easting and northing values to ensure the more precise polygon will remain within the boundaries of the less precise polygon. Related to this is the primacy of the southwest corner of the polygon being the labeling point for an entire polygon. In instances where the polygon is not a square and has been clipped by a grid zone junction, the polygon keeps the label of the southwest corner as if it had not been clipped.

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