S-401, the future Product Specification for Inland ENCs


IEHG is developing a product specification for Inland ENCs that is based on S-100, the universal hydrographic data model of the International Hydrographic Organization (IHO), and S-101, the future IHO ENC Product Specification.

IEHG has adopted an edition 1.0.0 of S-401 that is intended as a basis for testing and further developments. Like edition 1.0.0 of S-101 it is not complete and is not intended for operational use. The following table provides an overview of the planned editions:


Planned editions of S-401















The development of editions 1.1.0 and 2.0.0 is depending on the availability of the respective editions of S-101.

Please take into account that the development of the missing parts might lead to corrections in the published edition.