Workers in this unit group plan, co-ordinate, direct and participate in the operation, maintenance and repair of mechanical and related equipment on board ship, or direct from shore station mechanical overhauls, replacements and repairs in port for vessels of a shipping line. Their functions include: taking complete charge of ship's engine-room department, standing watch in engine or boiler room and supervising engine-room department personnel engaged in operation, maintenance and repair of shipboard machinery and equipment; directing from shore station the maintenance and replacement programme and repair work in port for machinery and equipment of vessels of a shipping line.