Command vessels in oceans, bays, lakes, rivers, or coastal waters.
<ul><li>Steer and operate vessels, using radios, depth finders, radars, lights, buoys, or lighthouses.</li><li>Dock or undock vessels, sometimes maneuvering through narrow spaces, such as locks.</li><li>Adjust navigation according to weather conditions.</li><li>Inspect vessels to ensure efficient and safe operation of vessels and equipment and conformance to regulations.</li><li>Conduct safety drills with crew.</li><li>Read gauges to verify sufficient levels of hydraulic fluid, air pressure, or oxygen.</li><li>Compute positions, set courses, and determine speeds, using charts, area plotting sheets, compasses, sextants, and knowledge of local conditions.</li><li>Measure depths of water, using depth-measuring equipment.</li><li>Signal passing vessels, using whistles, flashing lights, flags, or radios.</li><li>Maintain boats or equipment on board, such as engines, winches, navigational systems, fire extinguishers, or life preservers.</li><li>Signal crew members or deckhands to rig tow lines, open or close gates or ramps, or pull guard chains across entries.</li><li>Monitor the loading or discharging of cargo or passengers.</li><li>Maintain records of daily activities, personnel reports, ship positions and movements, ports of call, weather and sea conditions, pollution control efforts, or cargo or passenger status.</li><li>Calculate sightings of land, using electronic sounding devices and following contour lines on charts.</li><li>Direct or coordinate crew members or workers performing activities such as loading or unloading cargo, steering vessels, operating engines, or operating, maintaining, or repairing ship equipment.</li><li>Arrange for ships to be fueled, restocked with supplies, or repaired.</li><li>Purchase supplies or equipment.</li></ul>