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IHO Organigram
STRUCTURE OF IHO BODIES (Assembly, Council, Committees & Working Groups and Project Teams) (Click in the diagram below for access to Committees & Working Groups document pages) (Project Teams (PTs) are described under their parent Committee or Working Group page)
TWCWG - Vertical Reference Frame GNSS Datum details
Tides, Water Level and Currents Working Group (TWCWG) VERTICAL REFERENCE FRAME GNSS DATUMS Datum Details Supplied for General Analysis and Comparison
Página en Español
Los idiomas oficiales de la OHI son el Inglés y el Francés, pero algunos recursos están disponibles también en Español, y podrán acceder a ellos en esta página.
TWCWG - Tidal Data Sets Analysis
Results of Analysis of Data Sets
IHO C-55
The purpose of IHO C-55 Publication (available here) "Status of Hydrographic Surveying and Charting Worldwide" is to provide base data for governments and supporting international organizations as they consider the best means by which to implement responsibilities set out in Chapter V, Regulation 9, of the Safety of Life at Sea (SOLAS) Convention. It also informs IHO input to the United Nations Global Maritime Assessment.
NIPWG Product Specifications
NAUTICAL INFORMATION PROVISION Working Group (In English Only)
Brochure, presentation & videos
The Brochure The IH Brochure provides a brief outline of the activities of the International Hydrographic Organization. It is written for a wide audience, catering to all those that have an interest in the safe and efficient navigation of ships, protection of the marine environment and more generally to the improvement of the global economy through the provision of hydrographic services and products. For further information, see IHO Publication M-2. English French Spanish The Presentation The IHO Secretariat have produced a generic presentation that desribes the importance of hydrography. The presentation can be downloaded an used as needed. Videos Hydrography involves measuring the depth of the water and fixing the position of all the navigational hazards that lie on the seafloor, such as wrecks and rocks. This is done mainly with specialised ships and boats operating echo sounders and sonars, but also using survey aircraft fitted with lasers. Useful information can also be derived sometimes from satellite observations. Hydrography also involves measuring the tide and the currents. The most well-known application of hydrographic information is for making the nautical charts that all mariners use for navigation. Hydrographic information is required for the safe, efficient and sustainable conduct of every human activity that takes place in, on or under the sea. These videos provide information on the importance of hydrography.
HCA HPWG
HCA Hydrography Priorities Working Group (HPWG)
IHO-NF GEOMAC Project
Originally started as Japan Capacity Building Project (2009-2013), the Cartography, Hydrography and Related Training (CHART) Project (2014-2019) is now becoming the Geospatial Marine Analysis and Cartography (GEOMAC) project. It aims at providing education programme for young nautical cartographers with cutting-edge knowledge and it will start in September 2020 (postponed to January 2021 or later due to the impact of COVID-19), thanks to the generous support from the Nippon Foundation of Japan. This capacity building project has connected the nautical cartography community, currently 94 fellows from 48 countries. The skill and knowledge of this community contributes to solving regional and global challenges beyond the SOLAS obligation.
