GeoServer Beginner's Guide(Second Edition)
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Universal Transverse Mercator system

Commonly known as UTM, this is not really a projection. It is a system based on the Transverse Mercator projection. This projection uses a cylinder tangent to a meridian to unwrap the Earth's surface. A maximum of 5° of distortion from the central meridian is acceptable. The UTM splits the world into a series of 6° of longitudinal-wide zones. As you may guess, there are 60 zones numbered from Longitude 180W toward the east. Note that you cannot have a map representing more than one UTM zone. Indeed, UTM is well suited for large-scale maps. Consider the following image: