Legal notice for UK tide predictions

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The harmonic constants used to perform tide predictions for locations in the U.K. are derived from sea level data obtained from the British Oceanographic Data Centre (BODC) based at the Proudman Oceanographic Laboratory, Liverpool.  The predictions are not the same as those computed by the Proudman Oceanographic Laboratory, which uses its own sets of harmonic constants.

The data were supplied by the British Oceanographic Data Centre as part of the function of the National Tidal & Sea Level Facility, hosted by the Proudman Oceanographic Laboratory and funded by the Department for Environment, Food and Rural Affairs and the Natural Environment Research Council.

The text of the letter from Proudman Oceanographic Laboratory granting permission and stating conditions for using the BODC data to derive harmonic constants is available at  A scan of the letter is available at

The license agreement for the BODC data itself is available at  Please note that none of the BODC data has been redistributed.  Only harmonic constants derived from that data have been made available.