Fluid cooling agent.

See Owner Code.

The piston only compresses air with its stroke in one direction.

Said of a wind when it is light and variable in direction, not blowing steadily from any direction.

An anchor is said to bite when the flukes dig themselves into the ground and hold firm without dragging.

A wooden wedge fitting into a drainage hole in the bottom of a boat for the purpose of draining the boat when she is out of water.

The turbulent effect of air on the lee side of a sail when trimmed in too far.

A filter element whose medium consists of a series of uniform folds and has the geometric form of a cylinder, cone, disc, plate ... Synonymous with "convoluted" and "corrugated".

The renting of a boat

A receipt for goods issued by a carrier with an indication that the goods were damaged when received. Compare Clean Bill of Lading.

Without sufficient crew.

A sudden squall of wind accompanied by lightning.

The highest navigation bridge. It usually includes an added set of controls above the level of the normal control station for better visibility.

A distress call made by a vessel requiring assistance. These three letters were chosen because they were easy to make and read using Morse Code. Some believe the letters meant "Save Our Ship" or "Save Our Souls".

Depth measured; the number indicating depth on a chart; the process of measuring fuel or water in ships' tanks. A ship is thought to be "in soundings" when she is inside the 100 fathom line, and "off soundings" when she is outside that line. ...

Pounds per square inch, gauge. Pressure indicated by a pressure gauge.

White-lead and tallow used on standing rigging.

When the distance between the wave crests is less than normal.

The tendency of a boat to move sideways in the water instead of along its heading due to the motion of currents or currents.

An instrument with a movable arm to plot a course on a chart