Figure 9-17.-Division of a grid square.omitted; for example, the grid location of the bulliondepository at Fort Knox may be given as16SES90999315. This means zone-row 16S, 100,000-meter square ES, casting 9099, northing 9315.Actually, the casting is 590,990 and the northing4,193,150.If four digits are given in a coordinate element, thecoordinates pin a point down to a particular 10-metersquare. Consider figure 9-17, for example. For thepoint X, the two-digit coordinates 8893 would meanthat the point is located somewhere within the 1,000-meter-grid square 8893. To pin the location down toa particular 100-meter square within that square, youwould have to add another digit to each coordinateelement. The X lies four-tenths of 1,000 metersbetween line 88 and line 89; therefore, the casting ofthe 100-meter square is 884. By the same reasoning,the northing is 933. The coordinate for the 100-metersquare is therefore 884933. To pin the point down toa particular 10-meter square, you should add anotherpair of digits, these being determined by scalemeasurement on the map. It follows from all this thatthe coordinates previously given for the bullion at FortKnox (909993 15) locate this building with referenceto a particular lo-meter square.Figures 9-18 and 9-19 show the marginalinformation usually given on a UTM grid militarymap. Note the reference box, which gives the gridzone-row and 100,000-meter-square designation. TheFigure 9-18.-Marginal information on a military map (1).9-17
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