Definition
Mean tide level is the average of MHWS, MHWN, MLWN and MLWS, or in rough work the mean of a single high and low water, quoted as a height above chart datum. With MHWS 5.4 m, MHWN 4.2 m, MLWN 1.8 m and MLWS 0.6 m, mean level is 3.0 m. Tidal curves are drawn about it, and it approximates mean sea level closely enough for most pilotage estimates.
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