Q.M.E.D. (Qualified Members of the Engine Department)
Engine-room ratings qualified to operate and maintain machinery under the engineer officers, holding the appropriate certification under the STCW Convention. IMO-grounded
Quarter deck
A part of the upper deck toward the stern, traditionally an area of some ceremonial or command significance.
Quay
A solid structure alongside which ships berth to load and discharge.
Quick closing valve
A valve that can be shut rapidly, often remotely, to isolate a tank or line in an emergency; quick-closing valves on fuel and oil tanks are required for fire safety under SOLAS. IMO-grounded
Quick-acting cleat, battening device
A fitting that quickly secures and tightens a hatch cover or similar closure against its seal to keep it weathertight.