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World Hydrography Day
Celebrated on 21 June, World Hydrography Day highlights activities around the world and how they contribute to improved knowledge of the seas and oceans.
HSSC
HYDROGRAPHIC SERVICES AND STANDARDS COMMITTEE
IHO Online Catalogues
IHO Online Catalogues are maintained by the IHO Secretariat. This includes information provided by the RENCs, the Member States and other organizations.
GEBCO Symposium 2026
The upcoming GEBCO Symposium, to be held in Cartagena, Colombia, from 8-9 October 2026, will bring together the global ocean community to exchange knowledge, inspire collaboration, and advance our collective understanding of the seabed and the ocean environment.
S-100 Implementation Strategy
Last Update : 26 November 2025
Meetings
List of NHC Meetings Note: To access the meeting page, you'll need an IHO Portal account. If you don't have one yet, please follow the instruction provided at the link here to set up your account and gain access to the meeting page. Click the IHO Portal to get started.
AGL& RsWG
African Great Lakes & Rivers Sub-Working Group
S-100 Standards in Force
Introduction SOLAS regulations V/18 and V/19 requires that, to meet requirements for carrying charts (in terms of SOLAS), the Electronic Chart Display and Information System (ECDIS) equipment must conform to the relevant IMO performance standards. IMO resolution MSC.530(106) applied to S-100 ECDIS and thus in addition to S-57 based standards in force units must also comply with the following:
ENC Data Protection S-57
Introduction The IHO Data Protection Scheme defines security constructs and operating procedures that must be followed by Data Servers (providers of data) and Data Clients (systems that use the data). The purpose of data protection scheme is to provide: 1. Piracy Protection: i.e. to prevent unauthorised use of data by encrypting the ENC information. 2. Selective Access: i.e. to restrict access to ENC information to only those cells that a customer has been licenced for. 3. Authentication: i.e to provide assurance that the ENC data has come from approved sources
