A line drawn to indicate both the direction and magnitude of a force, such as leeway or a current.

Nautical slang for the spirit of the sea, usually in the form of a sea devil. Davy Jones's Locker is the bottom of the sea, the final resting place of sunken ships, articles lost or thrown overboard, and of men buried at sea.

Sea water used for ballast, let into the double bottom, or into a water-ballast tank, or trimming tanks.

A prisoner sold in the slave market. He was forced to serve in the war galleys, where he pulled on one of the oars.

Board, bearing instructions, that comes to a wrecked ship with a life-saving rocket line.

Ribbon, yarn, or other lightweight material attached to rigging or sails to indicate wind action or direction. Proper use of the telltales can help sailors improve their sail trim.

An inspection cover or port in an air receiver tank.

Atmospheric pressure as measured by a barometer.

A small local current usually caused by tidal streams as they ebb and flow around or against obstructions.

The center plank on a wooden deck.

(1) The rolled up part of a sail, tied with the reef lines, that is used to reduce sail area for heavy winds; To reduce the sail area. (2) A group of rocks or coral generally at a depth shallow enough to present a hazard to navigation.

Hoisting the ensign at 8 a.m. and down at sunset.

The sudden heave of the ship.

A compartment having a watertight bulkhead at each end.

Is the ratio of the polytropic compression energy transferred to the gas to the actual energy transferred to the gas.

Recapitulation of the terms and conditions agreed

A means of purifying an air stream by using both gravitational and centrifugal forces.

Succession of long and unbroken waves that are not due to meteorological conditions in the vicinity. Generally due to wind or storms at a distance from the position.

The most common type of sail used today, a triangle-shaped mainsail defined by the mast and one horizontal boom perpendicular to the mast.

After or trailing edge of a sail; the after edge of a fore-and-aft sail and the outer edges of a square sail.