Marsden square

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Marsden square

A system that divides a Mercator chart of the world into squares of 10° latitude by 10° longitude.

Each square is numbered and then subdivided into 100 one-degree squares numbered from 00 to 99. These 100 one-degree squares are applied to the eight octants of the globe. Marsden squares are mainly used for identifying the geographic position of meteorological data over the oceans.