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
The Admiralty Compass Observatory, also known as the Compass Department and originally known as the Compass Branch, was established in 1842 to provide the Royal Navy with services for the design, development, inspection, testing and repair of compasses and certain other instruments. It subsequently undertook requirements for the other services as appropriate. It existed until 1971 when it was absorbed within the Admiralty Surface Weapons Establishment.