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{{Short description|NATO global coordinate reference system}}
{{Geodesy}}
The '''Military Grid Reference System''' ('''MGRS''') is a geocoordinate standard used by [[NATO]] militaries for geo-referencing, position reporting, and situational awareness during land operations.<ref>{{cite web |url=https://www.jcs.mil/Portals/36/Documents/Library/Instructions/CJCSI%203900.01E.pdf |title=CJCSI 3900.01E Position (POS), Navigation, and Timing (PNT) and Global Positioning System (GPS) Requirements |publisher=Chairman of the Joint Chiefs of Staff |date=10 February 2023 |access-date=27 June 2025 |page=A-2 |quote=The Military Grid Reference System (MGRS) is the standard for military land operations for geo-referencing and position reporting.}}</ref> An MGRS coordinate does not represent a single point, but rather defines a square grid area on the Earth's surface. The ___location of a specific point is therefore referenced by the MGRS coordinate of the area that contains it. The MGRS is derived from the [[Universal Transverse Mercator coordinate system|Universal Transverse Mercator]] (UTM) and [[Universal Polar Stereographic coordinate system|Universal Polar Stereographic]] (UPS) grid systems and is used as a [[geocode]] for the entire Earth.
An example of an ''MGRS coordinate'', or ''grid reference'', is [{{Coor URL}}21_24_35.43062452380_N_157_54_57.89102787040_W_&language=en <code>4Q FJ 1234 6789</code>], which consists of three parts:
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