I have a locally-produced tide table – it shows different predictions compared to EasyTide. Which is correct?
We do not have access to the underlying database which has been used by other independent tide table publishers. Therefore, we cannot comment directly on the sources of the data they use in order to compute their tidal predictions. Suffice to say that any difference between two sets of tidal predictions will be accounted for by the following:- a) Differences in the time-series of raw tidal observations upon which the tidal analysis for a particular port has been conducted over, which then leads on to: b) Differences in the set of underlying data (i.e. the Harmonic Constants or Time and Height Differences) used to compute the predictions themselves. c) Slight differences in the prediction algorithms used to compute these predictions. So it is inevitable that there will be differences between any two sets of predictions based on the above facts. Thus the two sets of predictions are simply different, and neither is necessarily wrong.
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