International Hydrographic Organization

The International Hydrographic Organization (IHO) is an intergovernmental organization established in 1921 to improve global marine navigation and safety. It sets international standards for hydrography—the science of measuring and describing the physical features of oceans, seas, and coastal areas. By promoting the sharing of hydrographic data, IHO helps nations produce accurate nautical charts, which are vital for safe shipping and understanding marine environments. Comprising over 90 member countries, the organization plays a crucial role in marine policy and the sustainable use of ocean resources.