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ARHC Intersessional VTC-01 Meeting (2020)
ARHC Intersessional VTC-01 Meeting 29 April 2020 Last Update: 26 May 2020
MBSHC Letters
Crowdsourced Bathymetry
Crowdsourced bathymetry (CSB) is the collection and sharing of depth measurements from vessels, using standard navigation instruments, while engaged in routine maritime operations. CSB test tracks (in green) collected by NOAA’s Bay Hydro II and overlaid on hydrographic survey data, demonstrates how changes can be detected. Image courtesy of NOAA.
North Indian Ocean HC
East Asia HC
US / Canada HC
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.
Become a Member State
How to join the IHO to become a member state?
The S-100 framework is now operational
A significant step in the implementation of the S-100 ecosystem was officially achieved in January 2026, when the Phase 1 S-100 product specifications entered into force. Stakeholders can now access and use the operational version of these specifications in real-world environments.

