Commodore (Royal Navy) Commodore (Royal Navy) Commodore (Cdre) is a rank of the Royal Navy above captain and below rear admiral. It has a NATO ranking code of OF-6. The rank is equivalent to brigadier in the British Army and Royal Marines and to air commodore in the Royal Air Force. The rank of commodore was introduced during the 17th century in November 1674 (though not legally established until 1806). In 1684 the navy introduced two classes of commodore, the first known as a "Commodore Distinction" and the other a "Commodore Ordinary"; these would later evolve into commodores first and second class. In
Ships of the Royal Navy Ships of the Royal Navy Ships of the Royal Navy is a naval history reference work by J. J. Colledge (1908–1997); it provides brief entries on all recorded ships in commission in the Royal Navy from the 15th century, giving location of constructions, date of launch, tonnage, specification and fate. It was published in two volumes by Greenhill Books. Volume 1, first published in 1969, covers major ships; Volume 2, first published in 1970, covers Navy-built trawlers, drifters, tugs and requisitioned ships including Armed Merchant Cruisers. The book is the standard single-volume reference work on ships of the Royal Navy,