The International Hydrographic Organization works to ensure that all the world's seas, oceans and navigable waters are surveyed and charted, thereby supporting safety of navigation and the protection of the marine environment.

The Secretariat of the IHO is based in Monaco and is headed by a Secretary-General assisted by two Directors. They are elected by the IHO Member States at ordinary sessions of the Assembly. UN Assembly Resolution 53/32 invites maritime countries to provide hydrographic services.

The IHO has currently 100 Member States. The IHO Secretariat has been hosted by the Principality of Monaco since the creation of the organization in 1921. A large size map is available HERE / Map disclaimer.

The International Hydrographic Organization is an intergovernmental organization that works to ensure all the world's seas, oceans and navigable waters are surveyed and charted. Established in 1921, it coordinates the activities of national hydrographic offices and promotes uniformity in nautical charts and documents.