Marsden Chart
Marsden Chart :
A system introduced by Marsden early in the nineteenth century for showing the distribution of meteorological data on a chart, especially over the oceans. A Mercator map projection is used; the world between 80o N and 70o S latitudes being divided into Marsden "squares" each of 10o latitude by 10o longitude. These squares are systematically numbered to indicate position. Each square may be divided into quarter squares, or into 100 one-degree sub-squares numbered from 00 to 99 to give the position to the nearest degree
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