Mariners must be able to live and work in confined spaces on a moving vessel; maintain balance on a rolling deck; rapidly don an exposure suit; step over 24-inch door sills; open and close watertight doors (up to 56 pounds); pull heavy objects (up to 50 pounds) for distances up to 400 feet; climb steep stairs or vertical ladders without assistance; and participate in firefighting and lifesaving efforts, including wearing a self-contained breathing apparatus (SCBA) and handling fully charged fire hoses. Possible teaching assignments include teaching a variety of classes both on small boats and in the classroom and laboratories, teaching courses in small craft operation, teaching classes in vessel maintenance and operations, teaching other maritime courses as needed such as GMDSS or ECDIS, grading student performance and assessing STCW competencies as necessary in a timely manner according to stipulated procedures, and managing a safe working environment.