229-230) write in the 4th edition of Map Use, "the military aimed to minimize confusion when using long numerical coordinates" by specifying UTM zones and sub-zones with letters instead of numbers. As Phil and Julianna Muehrcke (1998, p.p. National Grid" is the same as the Military Grid Reference System (MGRS), a worldwide grid that is very similar to the UTM system. by the Federal Geographic Data Committee. national grid over the global UTM coordinate system is that it eliminates the boundary between the two UTM zones.Ī similar system has been proposed for the U.S. The corresponding UTM zones are 29 (central meridian 9° West) and 30 (central meridian 3° West). The grid is typically related to the Airy 1830 ellipsoid, a relationship known as the National Grid (OSGB36®) datum. national grid is a plane coordinate system that is based upon a Transverse Mercator projection whose central meridian is 2 West longitude, with standard meridians 180 km west and east of the central meridian. Positions within each grid square are specified in terms of eastings and northings between 0 and 100,000 meters. In the U.K., topographic maps published by the Ordnance Survey refer to a national grid of 100 km squares, each of which is identified by a two-letter code. The Transverse Mercator projection provides a basis for existing and proposed national grid systems in the United Kingdom and the United States.
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