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
History of the Royal Navy required coordination between the invasion fleet and the Spanish army on shore. But the poor design of the Spanish cannons meant they were much slower in reloading in a close-range battle, allowing England to take control. Spain and France still had stronger fleets, but England was catching up. The Royal Scots Navy (or Old Scots Navy) was the navy of the Kingdom of Scotland until its merger with the Kingdom of England's Royal Navy in 1707 as a consequence of the Treaty of Union and the Acts of Union that ratified it. From 1603 until 1707, the Royal Scots Navy