Digital data of maritime boundaries disseminated on the portal are derived from Shom calculations or digitisation of maritime boundary agreements or the decisions of international legal bodies. They are only disseminated when these elements enter into force in French legislation. This digital data is then used to update the French maritime boundaries shown on Shom nautical charts. Digital data and the nautical charts therefore represent the same information on maritime boundaries.
In any case, when elements enter into force on new maritime boundaries, the update time required for nautical charts is longer than for the digital product. During this time, the information shown on the updated digital product and on current nautical charts may differ. Once all updates to nautical documents and data are effective, there will no longer be a difference.