1. British Oceanographic Data Centre Liverpool UK
2. NOAA Laboratory for Satellite Altimetry College Park Maryland USA
3. Department of Geological Sciences Stockholm University Stockholm Sweden
4. Service Hydrographique et Océanographique de la Marine Brest France
5. Hydrographic and Oceanographic Department Japan Coast Guard (Retired) Tokyo Japan
6. Alfred Wegener Institute für Polar‐und Meeresforschung Bremerhaven Germany
7. Institute for Marine Sciences Consiglio delle Ricerche Bologna Italy
8. Lamont‐Doherty Earth Observatory of Columbia University Palisades New York USA
9. Center for Coastal and Ocean Mapping University of New Hampshire Durham New Hampshire USA