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Tetrads and tetrad letters 86 What are tetrads?

April 26, 2017letters tetrad tetrads

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Tetrads and tetrad letters 86 What are tetrads?

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Tetrads are 2km by 2km squares. There are 25 tetrads in each 10-km square (hectad) and each is identified by the Ordnance Survey grid reference of the 10-km square (SU43 say) plus a single letter suffix for the tetrad (eg. SU43B). Using a letter suffix avoids confusion with 1-km squares.