A professional who designs and oversees installation and repair of marine powerplants, propulsion systems, heating and ventilating systems, and other mechanical and electrical equipment in ships, docks, and marine facilities. Responsibilities include:

• Studies drawings and specifications and performs complex calculations to conceive equipment and systems designed to meet requirements of marine craft or facility.
• Oversees and evaluates operation of equipment during acceptance testing and shakedown cruises.
• May specialize in design of equipment, such as boilers, steam-driven reciprocating engines, heat exchangers, fire-control and communication systems, electric power systems, or piping and related fittings and valves.