A naval rank next below that of lieutenant-commander, which is next below that of captain (the equivalent of commander).

A device used to keep a person afloat. Also called a life preserver, life vest, PFD or personal floatation device.

A raft used in case of emergencies, such as sinking or fire.

A wearable device used to keep a person afloat. Also called a life jacket, life preserver, PFD or personal floatation device.

A line secured along the deck to lay hold of in heavy weather; a line thrown on board a wreck by life-saving crew; a knotted line secured to the span between life-boat davits for the use of the crew when hoisting and lowering

Small boat carried on the vessel and used in case of emergency.

a circular donut-shaped buoy designed to support a person in the water. It is attached to the vessel with a (floating) line so that the person can be hauled back to the boat.

Stout line or cable fore and aft around the deck of the boat to keep crew from falling overboard.

A wind shift that allows a boat to sail above its mean wind course.

The distance between the seat and disc seating surfaces when a valve is open.

In sailing, to be lifted by a wind shift that allows your boat to be lifted closer to the wind where by it allows you to sail a shorter distance to the next mark, buoy or finish line

On square-rigged ships, the lines which are lead from the masthead to the ends of the yards to support them.

A lit navigational aid such as a lighthouse that can be used at night or in poor visibility.

A list of navigational lights arranged in geographical order, giving the position and characteristics.

The water line when the ship rides empty.

An opening in a ship's side, provided with a glazed lid or cover for the admission of light.

Sails, such as the spinnaker, reacher and reaching staysail used when running or reaching

A vessel discharges part of its cargo at anchor into a lighter to reduce the vessel's draft so it can then get alongside a pier.

Holes cut in a plate to make it lighter and yet not reduce its strength.

An open or covered barge towed by a tugboat and used mainly in harbors and inland waterways to carry cargo to/from alongside a vessel.