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External Liaisons
Inter-Governmental Organizations and Non-Governmental Organizations are recognized as observers to be invited to meetings of the Assembly and all subsidiary organs and subordinate bodies of the IHO in which they have an interest and to which they can make a contribution. The IHO maintains a substantive number of Memoranda of Understanding and Co-operative Agreements with relevant organizations active in the maritime domain.
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The S-100 framework is now operational
A significant step in the implementation of the S-100 ecosystem was officially achieved in January 2026, when the Phase 1 S-100 product specifications entered into force. Stakeholders can now access and use the operational version of these specifications in real-world environments.
Circular Letters 2026
Women in Hydrography: New Data Reveal Gains in Leadership, Gaps in Workforce Representation
The latest data on the number of men and women working in hydrography have been released. With 51 IHO Member States answering the EWH 2025 survey, the results reveal advancements in some areas but also challenges.
