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Curvature of a sail.

can buoy

Cylindrical navigation buoy with a flat top, generally green in color.


To flip a boat over.


A winch used for hauling heavy objects such as anchors.

cast off

To unfasten all lines in preparation for departure.

casting platform

Elevated deck clear of obstruction used by anglers to make casts, often equipped with pedestal chairs.


A twin hulled boat, either power or sail.


Small, simple sailboat with one mast and sail set far forward.


Inefficient low-pressure pockets on propellers form bubbles that collapse against the blades resulting in premature wear.

center console boat

Fishing boat with the helm station located amidships for maximum walk-through space around the perimeter of the boat.


A keel-like pivoting device, typically in a trunk, that can be lowered or raised to act as a keel.


The navigable portion of a waterway.

chart plotter

Electronic navigation device that displays charts for use in plotting a course.

chart recorder

An electronic depth sounder that records bottom structure data on paper.


Paper or electronic navigation maps.


Portion of the hull where the bottom and sides intersect (can be rounded or angled).

chopped fiberglass

Fiberglass strands cut and simultaneoulsy mixed with resin by and applied to a boat mold by using a chopper gun.


Placing fish or fish parts in the water to attract gamefish.

class I hitch

Trailer hitch with a weight-carrying capacity up to 2,000 pounds; available as a bumper mount, step bumper or bumper/frame mount.

class II hitch

Frame-mounted trailer hitch with a weight-carrying capacity of up to 3,500 pounds.

class III hitch

Frame-mounted trailer hitch with a weight-carrying capacity of up to 5,000 pounds.

class IV hitch

Frame-mounted trailer hitch with a weight-carrying capacity of up to 10,000 pounds.


Hardware piece on a boat or a dock to which lines are attached.


The after-most corner of a sail.


Sailing as close to the wind as possible.


A raised edge, as around the cockpit or around a hatchway, to keep water out.

Coast Guard safety package

Basic safety gear required by federal law consisting of personal flotation device, throwable flotation device, visible distress signals, fire extinguisher and a horn, whistle or bell.


Deck space for the crew of a boat, typically recessed.


Coast Guard term for the navigation rules of the road; full name is International Regulations for Preventing Collisions at Sea.

come about

To tack or change heading relative to the wind.


Entryway from the deck to the belowdeck cabin area.


A bluewater fishing boat typically more than 35 feet long with a full cruising salon, a fish-fighting cockpit and many other saltwater fishing features.

coring material

Any of a variety of lightweight materials used between layers of fiberglass laminates to add strength.


Amateur yachtsman.

counter rotation

The act of two propellers spinning in opposite directions on a single shaft.


Component on a boat trailer that connects to the hitchball.


Direction in which a boat is steered.


A boat with overnight accommodations.

cuddy cabin

Belowdecks accommodations in the bow area for overnighting and stowage.


Hardening process for resin-soaked fiberglass laminates.


Attachable front and side enclosures that protect the helm area from weather.


Single-masted sailboat similar to a sloop, but with the mast farther aft to allow for a double headsail.