There's obviously going to be a difference, but the current Royal Navy rank structuring resides as:
Admiral of the Fleet - not sea going, head of the armed forces, sub the queen. (High Lord/High Lord adjutant/Sector Command?)
Admiral - not sea going - theatre of operations command (Sector command/sub sector command/AotF adjutant)
Vice Admiral - as above
Rear Admiral - as above
Commodore - Extreme Capital Ship captain/Task Force commander
Captain - Capital Ship Captain/Submarine Captain
Commander - Captains Adjutant/XO/minor war vessel/support vessel captain
Lt Commander - Minor War Vessel, Senior Officer of section (i.e engines, aircraft, navigation, electronics, manned weapons etc) on capital ships
Lieutenant - Minor War Vessels Senior section officer,Lt Commander adjutant on Capitals
SubLt - gaining experience, on the rise young officer, or awarded for long outstanding service as a rating (very unlikely)
Midshipman - officer in training, occasionally deployed in phase 2 or 3 training (2-3 years)
Warrant Officer 2nd Class - Typically, most experienced person on the ship. 24 years + service. Usually Divisional Officer, looks after 25% of the ratings.
WO 1st Class - As above. For an example of a WO1's career (although RM, check out my RSM's -
here).
Chief Petty Officer - Divisional Officers Adjutant.
PO - experienced, hardcore gents. Most people get here after 12-15 years service. Know their stuff, no fucking around.
Leading Hand - In charge of the messes (bunks, pits, bags, whatever), PO's adjutants.
Able Seaman - General duties in the specialization.
Recruit - take a guess.
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