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Military Grid Reference System
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==Grid zone designation== [[File:Universal_Transverse_Mercator_zones.svg|thumb|300px|UTM zones on an equirectangular world map with irregular zones in red and New York City's zone highlighted]] The first part of an MGRS coordinate is the ''grid-zone designation''. The 6Β° wide UTM zones, numbered 1β60, are intersected by latitude bands that are normally 8Β° high, lettered CβX (omitting I and O). The northmost latitude band, X, is 12Β° high. The intersection of a UTM zone and a latitude band is (normally) a 6Β° Γ 8Β° polygon called a ''grid zone'', whose ''designation'' in MGRS is formed by the zone number (one or two digits β the number for zones 1 to 9 is just a single digit, according to the example in DMA TM 8358.1, Section 3-2,<ref name="DMA8358_1_Chapter3"/> Figure 7), followed by the latitude band letter (uppercase). This same notation is used in both UTM and MGRS, i.e. the UTM grid reference system; the article on [[Universal Transverse Mercator]] shows many maps of these grid zones, including the irregularities for Svalbard and southwest Norway. As Figure 1 illustrates, Honolulu is in grid zone 4Q. [[Image:MGRSgridOriginSchemeAA.png|thumb|Figure 1. The origin of the MGRS grid, in the Pacific. Honolulu is in 4QFJ.]]
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