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

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. 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. Arrange for ships to be stocked, fueled, and repaired. Assume command of vessels in the event that ships' masters become incapacitated. Participate in activities related to maintenance of vessel security. Stand watches on vessels during specified periods while vessels are under way.

Transportation -- Knowledge of principles and methods for moving people or goods by air, rail, sea, or road, including the relative costs and benefits. Mechanical -- Knowledge of machines and tools, including their designs, uses, repair, and maintenance. Geography -- Knowledge of principles and methods for describing the features of land, sea, and air masses, including their physical characteristics, locations, interrelationships, and distribution of plant, animal, and human life. Administration and Management -- Knowledge of business and management principles involved in strategic planning, resource allocation, human resources modeling, leadership technique, production methods, and coordination of people and resources. Public Safety and Security -- Knowledge of relevant equipment, policies, procedures, and strategies to promote effective local, state, or national security operations for the protection of people, data, property, and institution

Coordination -- Adjusting actions in relation to others' actions. Management of Personnel Resources -- Motivating, developing, and directing people as they work, identifying the best people for the job. Operation and Control -- Controlling operations of equipment or systems. Time Management -- Managing one's own time and the time of others. Operation Monitoring -- Watching gauges, dials, or other indicators to make sure a machine is working properly. Mathematics -- Using mathematics to solve problems. Speaking -- Talking to others to convey information effectively. Judgment and Decision Making -- Considering the relative costs and benefits of potential actions to choose the most appropriate one. Critical Thinking -- Using logic and reasoning to identify the strengths and weaknesses of alternative solutions, conclusions or approaches to problems. Complex Problem Solving -- Identifying complex problems and reviewing related information to develop and evaluate options and implement solutions.

Far Vision -- The ability to see details at a distance. Control Precision -- The ability to quickly and repeatedly adjust the controls of a machine or a vehicle to exact positions. Oral Expression -- The ability to communicate information and ideas in speaking so others will understand. Oral Comprehension -- The ability to listen to and understand information and ideas presented through spoken words and sentences. Glare Sensitivity -- The ability to see objects in the presence of glare or bright lighting. Spatial Orientation -- The ability to know your location in relation to the environment or to know where other objects are in relation to you. Near Vision -- The ability to see details at close range (within a few feet of the observer).

Communicating with Supervisors, Peers, or Subordinates -- Providing information to supervisors, co-workers, and subordinates by telephone, in written form, e-mail, or in person. Operating Vehicles, Mechanized Devices, or Equipment -- Running, maneuvering, navigating, or driving vehicles or mechanized equipment, such as forklifts, passenger vehicles, aircraft, or water craft. Inspecting Equipment, Structures, or Material -- Inspecting equipment, structures, or materials to identify the cause of errors or other problems or defects. Getting Information -- Observing, receiving, and otherwise obtaining information from all relevant sources. Coordinating the Work and Activities of Others -- Getting members of a group to work together to accomplish tasks. Monitor Processes, Materials, or Surroundings -- Monitoring and reviewing information from materials, events, or the environment, to detect or assess problems. Identifying Objects, Actions, and Events -- Identifying information by categorizing, estimating, recognizing differences or similarities, and detecting changes in circumstances or events. Estimating the Quantifiable Characteristics of Products, Events, or Information -- Estimating sizes, distances, and quantities; or determining time, costs, resources, or materials needed to perform a work activity. Guiding, Directing, and Motivating Subordinates -- Providing guidance and direction to subordinates, including setting performance standards and monitoring performance. Handling and Moving Objects -- Using hands and arms in handling, installing, positioning, and moving materials, and manipulating things.