Definition
Each page shows a sea area for one hour relative to high water at a reference port, with arrows indicating the direction of the stream and figures giving the neap and spring rates in tenths of a knot, so 15,28 means 1.5 knots at neaps and 2.8 knots at springs. Interpolate for the day's range using the computation of rates diagram. Atlases give a far better regional picture than tidal diamonds, which are point observations.
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