A training course “S-57 to S-101 Conversion and S-100 Production Course” organised by the French Naval Hydrographic and Oceanographic Service (SHOM) and sponsored by PRIMAR was held for the members of the Eastern Atlantic hydrographic Commission (EAtHC) and the Mediterranean and Black Seas Hydrographic Commission (MBSHC) in Brest, France, from 15 to 19 September 2025..