Search results

HDCG

The HDCG is tasked with reviewing and updating the content of the reference version of the IHO Hydrographic Dictionary, currently available in Chinese, English, French, Indonesian, and Spanish, whilst maintaining close liaison with the IHO GI Registry and nationally developed language versions of the Hydrographic Dictionary maintained by individual or groups of Member States.

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.

Eastern Atlantic HC

Mediterranean and Black Seas HC

Finance Documents and Reports

  The IHO operates under a three year budget approved by the Assembly and an annual operational Budget endorsed by the Council, overseen by the Finance Committee and approved by the Member-States through correspondence. The most up-to-date list of the Finance Committee Members is linked here. The Member States are informed via Finance Circular Letters which can be downloaded from the Circular Letters section - under the top menu called "About IHO".

Become a Member State

How to join the IHO to become a member state?

Ex Abyssis ad Alta – IHO Award for Hydrographic Excellence 2025

With a hydrographic career spanning over 25 years, the winner of this year’s Ex Abyssis Ad Alta Award has consistently demonstrated technical expertise, and an unwavering commitment to innovation in hydrography in support of safer and smarter navigation. He has also been a central force in moving the S-100 implementation forward.

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.

SAIHC16 (2019)

16th SAIHC Conference (3 to 5 September 2019) and 8th ICCWG Meeting (2 September 2019)      Cape Town, South Africa