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Marconi Rig
The most common type of sail used today, a triangle-shaped mainsail defined by the mast and one horizontal beam.


A tool for opening the strands of a rope while splicing.
MIDSHIP - Approximately in the location equally distant from the bow and stern.


A spar set upright to support rigging and sails.


A boat with one hull.


An arrangement for securing a boat to a mooring buoy or a pier.



Nautical Mile
One minute of latitude; approximately 6076 feet - about 1/8 longer than the statute mile of 5280 feet.


The art and science of conducting a boat safely from one point to another.


Navigation Rules
The regulations governing the movement of vessels in relation to each other, generally called steering and sailing rules.



Toward or beyond the boat's sides. A detachable engine mounted on a boat's stern.


Over the side or out of the boat.



A line attached to the bow of a boat for use in towing or making fast. 


Pay Out
To ease out a line, or let it run in a controlled manner.


The line by which a boat is connected to a mooring buoy; a short rope hanging from a spar having at its free end a spliced thimble or a block.


Any nautical flags that taper to a point and used for identification.


Personal Flotation Device (PFD)
Official terminology for life jacket. When properly used a PFD will support a person in the water. Available in several sizes and types.


A loading platform extending at an angle from the shore.


A wood, metal or concrete pole driven into the bottom. Craft may be made fast to a pile; it may be used to support a pier (see PILING) or a float.


Navigation by using visible references.


The alternating rise and fall of the bow of a vessel proceeding through waves; the theoretical distance advanced by a propeller in one revolution; tar and resin used for caulking between the planks of a wooden vessel.


Support, protection for wharves, piers etc.; constructed of piles (see PILE).


Navigation by use of visible references, the depth of the water, etc.


To turn end over end in very rough seas. 

A boat is said to be planing when it is essentially moving over the top of the water rather than through the water.

Planing Hull
A type of hull shaped to glide easily across the water at high speed.


The left side of a boat looking forward. A harbor.


Priveleged Vessel
A vessel which, according to the applicable Navigation Rule, has right-of-way (this term has been superseded by the term "stand-on").


 A rotating device, with two or more blades, that acts as a screw in propelling a vessel.

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