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MACHC22 (2021)

22nd Meeting of the MACHC 30 November - 3 December 2021 (Online meeting)

MACHC25 (2024)

25th Meeting of the MACHC 3 - 6 December 2024 Panama City, Panama Logistics Information (Spanish)

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TWCWG

The TWCWG is tasked with providing technical advice and coordination on matters related to tides, water levels, currents and vertical datum, including integrated water level/current data models. Transfer of Tidal Constituents : An XML Schema has been prepared to facilitate the digital transfer of harmonic tidal constituents. The schema and further information is available from the UKHO web site. Capacity Building : The Working Group has developed a training course on the theory and measurement of tides and water levels in support of hydrography. Course material can be accessed via the link.

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Eastern Atlantic HC

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Become a Member State

How to join the IHO to become a member state?

Terms and Definitions

Updated on 14 May 2025

UN Ocean Decade Conference

The IHO and the OECD are co-hosting a satellite event during the UN Ocean Decade conference in Barcelona. Entitled "The Seabed Data We Need for the Ocean We Want," this session aims to look at the importance of advancing our understanding of the ocean and fostering increased investment in related activities.