The Scale
The Douglas Sea Scale, also called the International Sea and Swell Scale, was devised in the 1920s by Captain H.P. Douglas, who later became Vice Admiral Sir Percy Douglas and Hydrographer of the Royal Navy. Its purpose is to estimate the roughness of the sea for navigation. The scale has two codes: one code is for estimating the sea state, the other code is for describing the swell of the sea.
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