International Hydrographic Organization
The IHO was established in 1921 as the International Hydrographic Bureau (IHB). The present name was adopted in 1970 as part of a new international Convention on the IHO adopted by the then member nations. The former name International Hydrographic Bureau was retained to describe the IHO secretariat until 8 November 2016, when a revision to the Convention on the IHO entered into force. Thereafter the IHB became known as the "IHO Secretariat", comprising an elected Secretary-General and two supporting Directors, together with a small staff of 17, at the Organization's headquarters in Monaco.
Indian Naval Hydrographic Department
After Indian independence in 1947, the department continued its functions under the Surveyor-in-Charge of the Marine Survey of India from Bombay. Later the office was shifted to Dehradun by renaming it as Naval Hydrographic Office headed by Chief Hydrographer of the Navy, which was later re-designated Chief Hydrographer to the Government of India in 1964. In view of international role of India in hydrography, the office was renamed once again in 1997 as National Hydrographic Office.