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Term: Image: Definition:
Gelcoat
A combination of resin and pigment that comprises the smooth outside coating of a fiberglass boat.
Gunnel
Also known as the gunwale, this is an edge along the side of a boat. It works to add to the structure and provide strength to the overall design.
Gunwale
The upper edge of the side of a boat.
Halyard
Line used to hoist a spar or sail.
Hardtop
A large fiberglass roof or platform over the helm area.
Hatch
A deck opening.
Hawse pipe
Fittings in the deck or gunwale through which the anchor rode or dock lines run
Head
Toilet facilities or room where they are located.
Headsail
Any sail set forward of the mast.
Helm
Area of a boat where operational controls are located.
Holding Tank
Storage tank for gray water
Houseboat
A large, flat-bottom boat with square sides and house-like characteristics, such as comfortable furniture and living accommodations.
Hull
The structural body of the boat that rests in the water.
Inboard engine
An internal combustion engine often mounted amidships that runs a drive shaft through the hull bottom.
Jack Plate
A mounting device for an outboard motor that enables operators to vertically raise or lower the motor, thereby controlling propeller depth in the water.
Jet Boat
A boat powered by an engine with a water-pump used to create propulsion.
Jib
Triangular sail projecting ahead of the mast.
Keel
The bottom-most portion or longitudinal centerline of a hull.
Ketch
A sailboat similar in appearance to a yawl with a tall main mast and a shorter mizzen mast ahead of the rudder post.
Lifeline
Safety lines on deck that are grabbed to prevent falling overboard.
LOA
Length overall; the distance between the most forward part of the boat and the most aft part.
Lower Unit Gearcase Gear Housing
It provides mechanical support for the moving components, a mechanical protection from the outside world for those internal components, and a fluid-tight container to hold the lubricant that bathes those components.
Luff
The leading edge of a sail.
Mainsail
The largest regular sail on a sailboat.

Mast
Vertical spar that supports sails.