Geomatix: Tides are our Speciality

Our premier tidal product GeoTide is used by hydrographic offices, port authorities & shipping companies world-wide to create accurate tidal predictions.

GeoTide converts your tide gauge data into harmonic constants, instantly creating tide tables and graphs of tidal predictions, free of external copyright.

Accurate in-house tide tables help promote your harbour facility while reducing vessel waiting times and improving vessel throughput.

For marine survey, GeoTide also calculates Tidal Levels, MSL, LAT, HAT, MLW etc. These contours are essential for safe Navigation, and as legal boundaries for access/fishing rights, ownership and fishery protection e.g. Marine Protected Areas (MPAs).

By using statistical analysis of your tide gauge data, GeoTide now calculates the coastal sea-defence height required for a given flood return period (e.g once in 200 years), taking into account rising sea levels - ideal for coastal planning, and flood mitigation studies.

We also offer in-house services for Tidal Analysis & Prediction, and Expert Witness Legal Services on tidal matters.


GeoTide is used to determine the tidal 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.