Admiralty
It evolved from *Admiralty Navy War Council, (1909–1912) which in turn became the Admiralty War Staff, (1912–1917) before finally becoming the Admiralty Naval Staff in 1917. It was the former senior command, operational planning, policy and strategy department within the British Admiralty. It was established in 1917 and existed until 1964 when the department of the Admiralty was abolished, and the staff departments function continued within the Navy Department of the Ministry of Defence until 1971 when its functions became part of the new Naval Staff, Navy Department of the Ministry of Defence.
Admiralty Compass Observatory
In 1795 The post of Hydrographer of the Navy was created. He became responsible to the First Naval Lord for producing charts, 'Sailing Directions', 'Notices to Mariners', tide tables and light lists and for supplying chronometers, compasses and other scientific instruments to HM ships. He was also responsible for naval meteorology and for the Admiralty's links with the Meteorological Office. In 1820 the Hydrographer was been responsible for the Observatory, being advised by a Board of Visitors. In 1842 a Compass Branch as part of the Hydrographic Department was established. In 1911 The Compass Branch was affiliated to the Controller of the Navy's Department. Its work in connection with terrestrial magnetism was transferred to the Royal Observatory Greenwich when it was renamed the Compass Observatory. In 1917, it moved to Ditton Park and used the house and its immediate grounds when the compass branch was elevated to a department. The Radio Research Station of the Department of Scientific and Industrial Research was co-located at Ditton Park, and provided basic information in this field. In 1971, it was merged as part of the Admiralty Surface Weapons Establishment (ASWE) within the navigation division. The site was later renamed as Admiralty Research Establishment (ARE) Slough, and in its final years its became part of the Defence Research Agency (DRA) from 1991, and the Defence Evaluation and Research Agency (DERA) from 1995. After its release from Defence use, the whole site was bought by Computer Associates (now CA Technologies) in 1997