Supervise and coordinate activities of crew aboard ships, boats, barges, or dredges.

• Cadet, Deck
• Dredge Mate
• Mate, Fishing Vessel
• Mate, Ship
• Tugboat Mate

• Arrange for ships to be stocked, fueled, and repaired.
• Assume command of vessels in the event that ships' masters become incapacitated.
• 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.
• Inspect equipment such as cargo-handling gear, lifesaving equipment, visual-signaling equipment, and fishing, towing, or dredging gear, in order to detect problems.
• Observe loading and unloading of cargo and equipment to ensure that handling and storage are performed according to specifications.
• Observe water from ships' mastheads in order to advise on navigational direction.
• Participate in activities related to maintenance of vessel security.
• Stand watches on vessels during specified periods while vessels are under way.
• Steer vessels, utilizing navigational devices such as compasses and sextons, and navigational aids such as lighthouses and buoys.
• Supervise crew members in the repair or replacement of defective gear and equipment.
• Supervise crews in cleaning and maintaining decks, superstructures, and bridges.

• calculate sighting of land using chart or sounding devices
• captain water vessels
• compute position, set course, or determine speed of vessel
• direct and coordinate activities of workers or staff
• direct course or speed of ship
• identify positions of celestial bodies for navigational purposes
• inspect machinery or equipment to determine adjustments or repairs needed
• measure water depth
• monitor sonar or navigational aids
• monitor worker performance
• operate emergency fire or rescue equipment
• operate navigation technology or equipment
• order helmsperson to steer vessel
• oversee marine cargo handling
• oversee work progress to verify safety or conformance to standards
• perform safety inspections in transportation setting
• read maps
• read navigation charts
• recognize reefs, shoals, or other hazards by navigation aids
• stand watch on vessel
• steer boat or ship
• supervise crew aboard ship
• transport passengers or cargo
• understand admiralty law
• understand technical operating, service or repair manuals
• use established traffic or transportation procedures
• use geographic positioning system (GPS)
• use interpersonal communication techniques
• use knowledge of seamanship or boat handling
• use knowledge of tides and currents
• use local or regional geographical knowledge to transportation
• use two-way radio or mobile phone