A Deck Officer is a person responsible for the navigation and safety of a vessel. The four crossword solutions for the term Deck Officer are BOSN (4 letters), BOSUN (5 letters), MATE (4 letters), and SECONDMATE (10 letters). A BOSN is a ship's officer in charge of equipment and the crew. A BOSUN is a ship's officer in charge of maintenance and discipline. A MATE is a ship's officer who assists the captain in navigation and other duties. A SECONDMATE is a ship's officer who assists the first MATE in navigation and other duties.