Tide predictions services

Tide predictions services

Two services exist : tide prediction for a harbor (SPM) and tide predictions for a point at sea (SAPM).

They are only available to authenticated users with a valid subsciption key which can be purchased on the Shom store: SPM an SAPM. Access to SAPM includes access to SPM.

The available 3 predictions types are:

  • Hours and heights for high and low tides, possibly associated with tidal coefficients;
  • Water heights at a given time step (1, 5, 10, 15, 30 and 60 minutes);
  • Water threshold calculation (search for time slots for which a water level is higher or lower than a given threshold).

The predictions are available from 01/01/1700 to 20 years in the future, for a period limited to 20 years for each calculation. Predictions are delivered in different formats (TXT, XML).


If you wish to script the requests, check thath your server can accept security TLS1.2 minimum otherwise authentication will fail.