Is a technique for predicting whether water will tend to dissolve or precipitate calcium carbonate. If the water precipitates calcium carbonate, scale forming may result. If the water dissolves calcium carbonate, it has a corrosive tendency.

The process of plotting a theoretical position or future position based on advancing from a known position using speed, time, and course, without aid of objects on land, of sights, etc. Term comes from deduced reckoning, abbreviated first to "ded reckonin ...

A device for furnishing fresh air to compartments below deck or exhausting foul air. Construction designed to lead air below decks. May have a cowl, which can be angled into or away from the wind; and may be constructed with baffles, so that water is not ...

The behavior of perfect gases, or mixtures thereof, follows a set of laws. Boyle' law, Charle's law, Amonton's law, Dalton's law, Amagat's law, Avogadro's law, Poisson's law.

Warehouse Withdrawal for Transportation Immediate Exportation.Allows merchandise that has been withdrawn from a bonded warehouse at one U.S. port to be exported from the same port exported without paying duty.

The small triangular space found at the intersection of lines of position on a chart when a ship's position is determined by taking three bearings.

A small rail on tables and counters used to keep objects from sliding off when the vessel rolls and pitches.

A timber or rib of a ship running from the keel to the side rail; the transverse strengthening members in a ship's hull that extend from the keel to the deck or gunwale. The frames form the shape of the hull and act as a skeleton on which the hull plankin ...

An entry that allows foreign merchandise arriving at one port to be exported from the same port without the payment of duty.

Equipment used for serving meals.

1,000 board feet. One MBM equals 2,265 C.M.

see Gybe

The average level of the oceans, used when finding water depths or land elevations.

Also VMG. Actual boat speed after adjusting for such factors as current and leeway.

A method of docking with a boat's stern to the dock.

Gross tonnage is the basis on which manning rules and safety regulations are applied, and registration fees are reckoned. Port fees are also often reckoned on the basis of GT and NT. GT and NT are defined according to formulas which take account, among ot ...

A suitable beach, being steep and sandy, where ships could be careened for cleaning or repair.

The ability of a boat to keep from being moved sideways by the wind. Keels, daggerboards, centerboards, and leeboards are all used to improve a boat's lateral resistance.

A distinctive fixed reference point that can be used for navigation.

The framework of timber, etc., on which a vessel is built, from which she is launched into the water.