Why do we need the arbitrary grid system on a topo sheet?
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arbitrary grid. [′är·bə‚trer·ē ′grid] (mapping) Any reference system developed for use where no grid is available or practical, or where military security for the reference is desired.
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Grid references define locations in maps using Cartesian coordinates. Grid lines on maps define the coordinate system, and are numbered to provide a unique reference to each location on the map. This reference is normally based on projected eastings and northing
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