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
Hydrographer of the Navy Hydrographer of the Navy Hydrographer of the Navy is a Royal Naval appointment. From 1795 until 2001 the post was responsible for the production of charts for the Royal Navy, and around this post grew the United Kingdom Hydrographic Office. In 2001 the post was disassociated from UKHO, and the Hydrographer of the Navy is now a title bestowed upon the current Captain (Hydrography and Meteorology) on the staff of Commodore Devonport Flotilla. Before the establishment of the post, captains of Royal Navy ships were responsible for the provision of their own charts. In practice this meant that ships often