A professional who repairs and maintains deck machinery, such as cargo winches and anchor windlasses. Respnsibilities include:

• Operates machinery to determine causes of malfunctioning.
• Dismantles, repairs, or replaces defective parts, and reassembles machinery, using machinist's handtools, chain hoists, and steel rollers.
• May maintain ship's plumbing system.
• May change fuses and lights and overhaul electric motors.
• Rating must be endorsed by U.S.
• Coast Guard.