Geomatix: Tides are our Speciality


Marine & Leisure: Tidal Prediction

Flooding, Fishing & Legal

All predictions and harmonic constants are free of external copyright.

GeoTide is used to determine the tidal harmonic constants for tidal stations on the River Thames and in the Thames Estuary by The Port of London Authority; these constants are then used by the UKHO as the official tidal constants in Admiralty Publications e.g. NP201.