The point of the computation table is that it gives a more accurate tidal vector on the day than can a cursory interpolation between the rates published. The latter are mean rates and do not show the actuals occuring say at the time of the equinoxes when the drift of the tidal stream might well be significantly greater than the mean. Of course this is only relevant in certain circumstances e.g. if you were navigating in a sea area where the rates are strong and you are in the equinoctial season. Much of the time you can safely interpolate 'by eye'. But it is right to know that sometimes it is not. Also worth remembering that this is not 'RYA' data; but Admiralty with a deep rooting in maritime navigational techniques.
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Re: Tidal streams - Computation of rates.....
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