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Map geeks only - the UTM coordinates system explained

UTM coordinates, or (Universal Transverse Mercator) is generally the preferred coordinate system to use for land navigation. 

A metric system developed by the US Army in the 1940s, UTM coordinates it allows you to eyeball your position on a large scale map down to about 100 meter accuracy.
Useful for both your GPS receiver and map reading, a deeper understanding of how the coordinates are derived can be useful.

Have a look at this web page that explains it well!

Mazamas
image from wwwmaptools.com