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IHO Assembly
The Assembly as the main organ of the Organization is formed by the representatives of the Member States. It meets every three years to provide general guidance on the functioning and work of the Organization, as well as taking decisions of technical and administrative nature. IHO Publications M-1 Basic Documents of the IHO contains a detailed description of the procedural arrangements for IHO Assemblies.
IHO Secretariat
The Secretary General and Directors, together with international experts in hydrography and nautical cartography as well as locally-recruited administrative support staff make up the IHO Secretariat in Monaco. The Secretariat coordinates and promotes the IHO's work programmes and provides advice and assistance to Member States and relevant third parties.
Importance of Hydrography
Definition of Hydrography Hydrography is the branch of applied sciences which deals with the measurement and description of the physical features of oceans, seas, coastal areas, lakes and rivers, as well as with the prediction of their change over time, for the primary purpose of safety of navigation and in support of all other marine activities, including economic development, security and defence, scientific research, and environmental protection. In addition to supporting safe and efficient navigation of ships, hydrography underpins almost every other activity associated with the sea, including: - resource exploitation - fishing, minerals,.. - environmental protection and management - maritime boundary delimitation - national marine spatial data infrastructures - recreational boating - maritime defence and security - tsunami flood and inundation modelling - coastal zone management - tourism - marine science
World Hydrography Day
Celebrated on 21 June, World Hydrography Day highlights activities around the world and how they contribute to improved knowledge of the seas and oceans.
HSSC
HYDROGRAPHIC SERVICES AND STANDARDS COMMITTEE
IHO Online Catalogues
IHO Online Catalogues are maintained by the IHO Secretariat. This includes information provided by the RENCs, the Member States and other organizations.
World Hydrography Day 2026: Transforming How Ocean Data Is Shared
Every year on 21 June, the International Hydrographic Organization (IHO) and its Member States celebrate World Hydrography Day, highlighting the vital role hydrography plays in improving our understanding of the ocean and supporting its safe, sustainable, and productive use.
GEBCO Symposium 2026
The upcoming GEBCO Symposium, to be held in Cartagena, Colombia, from 8-9 October 2026, will bring together the global ocean community to exchange knowledge, inspire collaboration, and advance our collective understanding of the seabed and the ocean environment.
Historic Outcomes at 2026 Assembly: New Leadership, New Structures, and Global Standards
Representatives of the 104 IHO Member States reached decisions which will change the future of the organization during the 4th session of the Assembly. This triennial event held in Monaco saw crucial advancements in hydrography and international collaboration including the creation of a new entity, a new office, as well as new leaders.
