A disturbance of surface water by conflicting current or by winds.

A call to turn out of bunks.

A metal pin by which the plating and other parts of iron and steel vessels are joined. Rivets are known by their heads, such as: Flush, pan, snap, plug, tap, countersunk, mushroom, and swollen neck.

A shortening of the term, "Roll On/Roll Off." A method of ocean cargo service using a vessel with ramps which allows wheeled vehicles to be loaded and discharged without cranes.

That geographical belt located approximately in 40 degrees south latitude in which are encountered the prevailing or stormy westerlies.

A pneumatic percussive drill designed as a boring tool.

The upward curvature of the keel towards the bow and stern.

Seaman's name for a reef knot tied upside down. also called a "granny" knot.

The alternating motion of a boat, leaning alternately to port and starboard; the motion of a boat about its fore-and-aft axis.

To re-book cargo to a later vessel.

A method of storing a sail, e.g., by rolling the jib around the headstay.

A system of reefing a sail by partially furling it. Roller furling systems are not necessarily designed to support roller reefing.

The side-to-side (athwartship) motion of a vessel.

A type of journal bearing in centrifugal air compressors.

- A hitch used for bending a line to a spar, which if tied properly, won't slip. The end of the line is passed around the spar and then passed a second time around so it rides over the standing part. Then it is carried across and up through the bight.

The navigable water to leeward of a vessel.

When rope comes aboard a vessel and is put to use, it is called line, although some still call it rope if it is over one inch in diameter.

A pneumatic device with a rotary output. Typically of a vane or rack-and-pinion construction.

A compressor belonging to the group of displacement rotary compressors, a type of valve less displacement machine. Also referred to as "Roots blower".

Machines in which compression is effected by the positive action of rotating elements.