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Among the merchant fleets of countries that have ratified the STCW Convention, the department and its manning requirements, including the responsibilities of each rank are regulated by that STCW Convention. [1] The department is led by deck officers, who are licensed mariners, and they are commanded overall by the ship's captain.
The chief mate is the head of the deck department on a merchant's vessel, second-in-command after the ship's master. The chief mate's primary responsibilities are the vessel's cargo operations, its stability, and supervising the deck crew.
A chief mate (C/M) or chief officer, usually also synonymous with the first mate or first officer, is a licensed mariner and head of the deck department of a merchant ship. The chief mate is customarily a watchstander and is in charge of the ship's cargo and deck crew. [1]
A third mate (3/M) or third officer is a licensed member of the deck department of a merchant ship. [1] The third mate is a watchstander and customarily the ship's safety officer and fourth-in-command (fifth on some ocean liners). The position is junior to a second mate. Other duties vary depending on the type of ship, its crewing, and other ...
A second mate (2nd mate) or second officer (2/O) is a licensed member of the deck department of a merchant ship holding a Second Mates Certificate of Competence, [1] by an authorised governing state of the International Maritime Organization (IMO).
This enables the second officer, who is the ship's navigator, to take morning and evening star sights. In ships with only four deck officers, the third officer will keep the 8 to 12, the second officer the 12 to 4, and the chief mate (equivalent to the executive officer in a navy ship) the 4 to 8 watch.
A boatswain (/ ˈ b oʊ s ən / BOH-sən, formerly and dialectally also / ˈ b oʊ t s w eɪ n / BOHT-swayn), bo's'n, bos'n, or bosun, also known as a deck boss, or a qualified member of the deck department, is the most senior rate of the deck department and is responsible for the components of a ship's hull.
A mate is a deck naval officer aboard a merchant vessel, such as the chief mate (first mate), second mate, or third mate. Between 1800 and 1890 "mate" was also the naval rank now known as sub-lieutenant—master. One of the mates is always the watch keeping officer, unless the master takes that responsibility.