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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.
Education & Programme Recognition
The IHO places education and training in the frontline of its Capacity Building Programme.
DCDB
In 1988, the U.S. National Geophysical Data Centre (NGDC) offered to host and operate a Worldwide digital oceanic bathymetry data center on behalf of the IHO Member States. This led to the official establishment (in June 1990) of the IHO Data Centre for Digital Bathymetry (DCDB). Data provided by the IHO Member States are available for download from the DCDB web site. It is possible to search, view or download all available data using the DCDB Web Map Server and GEODAS interfaces (please see below).
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.
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?
IHO Strategic Plan and Work Programme
The IHO runs a 3-yearly budgetary cycle. Each budget cycle is based on forward forecast approved by the Member States at the previous Assembly. Each yearly forecast is reviewed in the preceding year and any changes approved by the Member States. The approved budget supports an annual work programme that is also approved by the Member States.
Achieving a Fully Mapped Ocean: A Call to Action
This interactive side event will look at solutions and how to drive momentum toward a fully mapped ocean. It will explore key opportunities and challenges across policy, finance, governance, technology, marine knowledge sharing, capacity building and more.

Encoding Bulletins
S-57 Edition 3.1 Encoding Bulletins