Definition
The average, over a long period, of the heights of two successive high waters during those 24 hours when the range is greatest. On Admiralty charts the elevations of lights and of coastal features such as cliff tops are measured from MHWS, and the coastline itself is drawn at that level. Together with MHWN, MLWN and MLWS it forms the four tabulated levels used in secondary port interpolation.
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