Required to have sufficient cardio-respiratory fitness to perform medium-heavy physical labor involving the ability to sit and/or stand for extended time frames, walk for prolonged periods, handle various tools, climb ladders, and climb stairwells. Ensures cleanliness of the engine room, bilges, rudder room, and void spaces, maintains engine room watch when underway, examines machinery for specified pressures and flow of lubricants, oils, and greases moving parts.