Ensemble résultant du découpage par zones du chenal de navigation.Ces passes sont régulièrement hydrographiées.

In its 2013-2016 version, the National Hydrographic Programme (PNH) details hydrographic surveys in the maritime areas under French responsibility which are conducted in order to meet France’s international obligations relating to navigational safety (International SOLAS convention). The PNH will be updated yearly in order to account for the new requirements put forward by the maritime community, and the hydrographic capability of the SHOM which can be put into practice in areas under French responsibility.