Who is the officer in charge of deck seaman aboard a ship?

The officer in charge of deck seaman aboard a ship is the First Lieutenant. This role is vital as the First Lieutenant is responsible for the daily operations on the deck, including the management of personnel and the oversight of deck maintenance. This officer coordinates with the crew to ensure that all tasks related to seamanship, watchstanding, and deck operations are executed efficiently and in line with naval standards. The First Lieutenant also plays a key role in training and supervising junior personnel, ensuring that all deck activities are conducted safely and effectively.

In this context, the role of the First Lieutenant is distinct from that of other officers mentioned. The Captain, while ultimately responsible for the entire ship and its operations, relies on the First Lieutenant to manage deck operations directly. Similarly, the Chief Petty Officer, while an essential leader among enlisted personnel, typically does not hold the overall responsibility for the entire deck crew in the same way the First Lieutenant does. The Navigator, on the other hand, focuses on the ship's course and navigation, rather than the deck personnel. Thus, the First Lieutenant is the correct answer to this question about who supervises the deck seaman aboard a ship.