Air commodore is never shortened to Commodore, which is a rank in various naval forces. Air commodore is a one-star rank and the most junior air officer rank, being immediately senior to group captain and immediately subordinate to air vice-marshal. It has a NATO ranking code of OF-6 and is equivalent to a commodore in the Royal Navy or a brigadier in the British Army or the Royal Marines. Unlike these two ranks, however, it has always been a substantive rank. Additionally, air commodores have always been considered to be air officers whilst Royal Navy commodores have not since the Napoleonic Wars
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