Longitude zones are six degrees wide. They are numbered from 01 at 180° west, increasing towards the east until 60 at 180° east.
Latitude zones are 8° high. They are lettered from C to X, omitting the letters "I" and "O", beginning at 80° south. The letters A, B, Y and Z are used in the polar regions by the Universal Polar Stereographic grid system.
A grid reference is read "right, up", as indicated by the arrows. A reference is always written with the longitude zone first. In this example, "17T".
Exceptions to the system are apparent. The west coast of Norway is given a wider zone 32V, taking some space from the zone 31V that covers open water. The zones around Svalbard are also widened, effectively deleting some longitude zones at this latitude. Finally, the entire latitude zone "X" is extended an extra 4°, topping off at 84° north.
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The longitude and latitude zones in the Universal Transverse Mercator system. Longitude zones are six degrees wide. They are numbered from 01 at 180° west, increasing towards the east until 60 at 180° east. Latitude zones are 8° high. They are le
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