Sea Level Station Monitoring Facility (UNESCO/IOC)


The objectives of the real-time data service developed by the IOC are

  • to provide information about the operational status of global and regional networks of real time sea level stations (for quick appraisal of the availability and performance of each station and the type of transmission used and the latency of the real-time data)
  • to provide a display service for quick inspection of the raw data stream from individual stations.





How to access the real-time data


It is easy to choose the tide data you wish to see by simply clicking on the station of your choice.

Cliquer sur la carte pour accéder au portail de la COI - sea level monitoring facility

Network Status on July 24, 2012 Click the "Map" tab at for a fully up-to-date view of the network.


Viewing tide data


Clicking on the selected station brings up the latest observations (Saint-Malo in this example).

Données du marégraphe de Saint-Malo (cliquer sur la figure pour l'agrandir)

Example: Saint-Malo tide gauge data on June 3, 2010


Origin of the portal



This site was initially developed for stations in Africa, with collaboration between IODE's ODINAFRICA project and the Flanders Marine Institute (VLIZ). The site was then extended to worldwide monitoring of real-time tide stations participating in IOC programmes:

  • GLOSS (Global Sea Level Observing System Core Network);
  • Tsunami alert systems developed under the aegis of the IOC: The tsunami alert system in the Indian Ocean (IOTWS), the tsunami alert system in the North-East Atlantic and Mediterranean (NEAMTWS), the tsunami alert system in the Caribbean (CARTWS), and the tsunami alert system in the Pacific (PTWS).


French tide stations


As of August 2012, the French tide gauges providing real-time data on this site are:

  • Ajaccio, Arcachon Eyrac, Boucau-Bayonne, Boulogne-sur-Mer, Brest (GLOSS), Calais, Concarneau, Dzaoudzi [Mayotte] (GLOSS), Centuri, Cherbourg, Concarneau, Dieppe, Dunkerque,  Fort-de-France [Martinique], Fos-sur-Mer, La Figueirette, Ile Rousse,  Ile d'Aix, La Rochelle, Le Conquet, Le Crouesty, Le Havre, Les Sables d'Olonne, Marseille (GLOSS), Nice, Nouméa [New Caledonia], Pointe-à-Pitre [Guadeloupe], Pointe-des-Galets [Reunion] (GLOSS), Port-Bloc, Port-Ferréol, Port-Tudy, Port-Vendres, Roscoff, Saint-Malo, Saint-Nazaire, Sainte-Marie [Reunion], Saint-Pierre [Saint-Pierre et Miquelon], Sète, Socoa, Solenzara and Toulon for the tide stations operated by SHOM ;
  • Saint-Paul (GLOSS) and Kerguelen (GLOSS) in the French Southern and Antarctic Territories are operated by LEGOS
  • Rikitea (GLOSS), Nuku Hiva (GLOSS), and Papeete (GLOSS) in French Polynesia are operated by the CEA/LDG, the University of Hawaii and SHOM
  • Vairao, Rangiroa, Tubaï, Huahine and Rikitea_Wharf in French Polynesia are operated by the University of French Polynesia and SHOM;
  • Hienghene, Lifou, Maré, Ouinné is operated by the General Delegation for the Overseas Territories, the Government of New Caledonia and SHOM;
  • Leava is operated by the Permanent Secretariat for the Pacific and SHOM;
  • Hiva Oa is operated by the CEA/LDG;
  • La Désirade is operated by the IPGP.
Liste des marégraphes français présent sur le portail de la COI

French tide stations present on the portal established by the IOC


To find out more:




Last updated: 12/12/2012