Boatswain
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A boatswain, 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. The boatswain supervises the other members of the ship's deck department, and typically is not a watchstander, except on vessels with small crews. Additional duties vary depending upon ship, crew, and circumstances.
The boatswain aboard a US merchant ship stands cargo watch as freight is lowered into an open hatch, c.1981
Boatswain of the Royal Navy, c. 1820
Boatswain of Felix von Luckner's yacht Seeteufel, smoking a pipe and hosing the vessel's deck
Third mate
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A third mate (3/M) or third officer is a licensed member of the deck department of a merchant ship. The third mate is a watchstander and customarily the ship's safety officer and fourth-in-command. The position is junior to a second mate. Other duties vary depending on the type of ship, its crewing, and other factors.
The 3rd mate is often the ship's safety officer.
While a ship is underway, the officers navigate it, typically in three shifts or watches.
Avoiding collisions can be challenging in heavy traffic.
Demonstration of wearing a life vest for safety especially during on abandon ship.