COLREGs

The International Regulations for Preventing Collisions at Sea (1972, amended) — the body of rules governing rights of way, lights, shapes, and sound signals at sea.

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Related C-terms

Code Zero

A very flat, large, reaching sail set on a continuous-line furler forward of the forestay;…

Centerline

The imaginary line running down the middle of the vessel from bow to stern.

Current

Horizontal movement of water driven by tide, wind, river flow, or ocean circulation.

Close reach

A point of sail between close-hauled and a beam reach, with the apparent wind about 70° of…

Coil

To lay a rope down in neat, uniform loops for storage, or the stored loops themselves.

Chartplotter

An electronic display that overlays the vessel's GPS position on digital charts, and often…

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