Are you asking about these three ratings or asking what *all* the jobs on a ship are? From Wiki: United States Navy The quartermaster is the enlisted member in charge of the watch-to-watch navigation and the maintenance, correction, and preparation of nautical charts and navigation publications. He is also responsible for navigational instruments and clocks and the training of ship's lookouts and helmsmen. He performs these duties under the control of the ship's navigator or other officer if there was no officer navigator. In the modern navy, a quartermaster is a petty officer who specializes in navigation. The rating abbreviation is QM. The symbol used for the rating and worn on uniforms is a ship's wheel. United States Coast Guard The structure of ranks and job specialties of the United States Coast Guard is similar to the that of the United States Navy. The Coast Guard used a Quartermaster rating until the summer of 2003, when the rating was merged into the Boatswain's Mate rating. [edit] Ship's Boatswain In the U.S. Navy the Ship's Boatswain is an officer who assists the First Lieutenant by supervising the deck force in the execution of major seamanship functions and the maintenance of topside gear.[4] The Ship's Boatswain supervises cargo handling [4] and inspects and maintains rigging and deck gear.[4] His duties also include supervising anchoring, mooring, fueling, towing, transferring of personnel and cargo, and the operation and maintenance of ship's boats.[4] The Ship's Boatswain is in charge of what the Navy deems "unusual" seamanship operations such as retrieving target drones,[4] and also schedules training for deck division personnel.[4] Another key duty of the Ships' Boatswain is supervision of the maintenance of abandon-ship equipment and instruction in abandon-ship techniques.[4] Coxswain [edit] United States Coast Guard In the United States Coast Guard and United States Coast Guard Auxiliary the coxswain has the authority to direct all boat and crew activities during the mission and modify planned missions to provide for the safety of the boat and the crew.[1] A "boat" is any vessel less than 65 feet in length. Before a person can be assigned to be a coxswain, they have to go through a qualification procedure, be certified and maintain the certification to be a coxswain. Upon certification, they are awarded the Coxswain Badge. This qualification procedure requires a significant amount of practice in boat handling as well as previous experience as a boat crew member. Any Coast Guard member (enlisted or officer) may become a coxswain upon proper qualification. An advancement to BM2 (Boatswain's Mate second class) requires that the individual qualify as and maintain certification as a coxswain. A commanding officer or officer in charge of a land based unit with boats has to be certified and stay certified as a coxswain on all boats in the unit or be relieved of command. A coxswain is assigned to a boat by the command authority and can only be relieved by the commanding officer or the senior officer present. The coxswain’s authority is independent of rank and/or seniority in relation to any other person onboard the boat.[2] Unlike the commanding officer (captain) of a cutter or ship, a coxswain does not automatically have command authority.

It depends on the ship, but there are a LOT of them, especially on a big ship like an aircraft carrier. Storekeeper, Hull Technician, Electrician, Dentist, Chaplain, Engineman, Journalist, Aircraft Ordnance, Yeoman, Mess Specialist, Crypto-tech, Radioman... and that isn't even *close* to a complete list. Not all ships have all ratings, but there may be three or four DOZEN different ratings present at any given command and that is not counting TAD assignments where someone may be working outside their normal specialty for a job that has no rating of it's own, like recruiting.