The "master of a ship" is the person in charge of navigating and operating a vessel. This individual is responsible for the safety of the ship, its crew, and any passengers on board. The master must have extensive knowledge of maritime laws, navigation techniques, and emergency procedures. In addition to overseeing daily operations, the master also manages the crew and coordinates with other maritime professionals. They ensure that the ship complies with regulations set by organizations such as the International Maritime Organization and maintain communication with authorities like the Coast Guard.