The swiveled opening at the top of a ventilator.

Master of a sea-going vessel. Certificated officer competent and qualified to be master of a sea-going vessel.

The adjustment of the standing rigging, the sails and the hull to balance the boat for optimum performance.

The action of letting go the sheets of a sailing vessel, thus spilling the wind and reducing the forward motion of the boat.

The length of the boat at the waterline.

Short for compressed natural gas or CNG. A type of compressed gas used as fuel for stoves and heaters. CNG is stored in metal cylinders prior to use. CNG is considered safer than other types of fuel such as propane LPG - because it is lighter than air and ...

To continue sailing under the same canvas despite the worsening of the wind.

To reeve and secure a stopper (hold a strain on a line while transferring it).

The highest level of cube utilization that can be achieved when loading cargo into a container.

To fake line back and forth on deck.

Narrow triangular sail set on a long yard or spar, the forward end of which is hauled down so that it sets obliquely on the mast with a high peak.

Sailing close hauled. Sailing toward the wind as much as possible with the wind coming from the bow.

The relationship of flow per unit area to differential pressure across a filter medium.

The carbon left after evaporating an oil under controlled conditions.

A drogue or drag device to slow down a boat, hold its bow into the sea in heavy weather, and reduce the boat's drift downwind.

The medium or material that does the actual filtering or separating. May be paper, wire mesh, special cellulose, inorganic plastic, or a combination.

Steel disc, that is dogged down over a porthole to secure against breakage of the glass and to prevent light from showing through.

Said of cable when it extends vertically and taut from anchor to hawsepipe.

A float with a flag at the top of a pole. Used to mark a position such as for a mooring, a race or a man overboard.

A windlass or capstan drum.