Supervise or coordinate activities of crew aboard ships, boats, barges, or dredges.
<ul><li>Stand watches on vessels during specified periods while vessels are under way.</li><li>Assume command of vessels in the event that ships' masters become incapacitated.</li><li>Steer vessels, using navigational devices, such as compasses or sextants, or navigational aids, such as lighthouses or buoys.</li><li>Determine geographical positions of ships, using lorans, azimuths of celestial bodies, or computers, and use this information to determine the course and speed of a ship.</li><li>Inspect equipment, such as cargo-handling gear, lifesaving equipment, visual-signaling equipment, or fishing, towing, or dredging gear, to detect problems.</li><li>Observe loading or unloading of cargo or equipment to ensure that handling and storage are performed according to specifications.</li><li>Participate in activities related to maintenance of vessel security.</li><li>Arrange for ships to be stocked, fueled, or repaired.</li><li>Supervise crew members in the repair or replacement of defective gear or equipment.</li><li>Supervise crews in cleaning or maintaining decks, superstructures, or bridges.</li></ul>