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block and tackle - A
combination of one or more blocks and the associated tackle necessary to
give a mechanical advantage. Useful for lifting heavy loads. |
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block - One or more wheels
with grooves in them pulleys - designed to carry a line and change the
direction of its travel. A housing around the wheel allows the block to
be connected to a spar, or another line. Lines used with a block are
known as tackle. |
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boatswain - Also bosun,
bos'n, bo's'n, and bo'sun, all of which are pronounced bosun. A crew
member responsible for keeping the hull, rigging and sails in repair. |
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bolt rope - A line rope -
sewn into the luff of a sail. The bolt rope fits in a notch in the mast
or other spar when the sail is raised. |
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boom vang - Any system used
to hold the boom down. This is useful for maintaining proper sail shape,
particularly when running or on a broad reach. |
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bow & beam bearings - A
set of bearings taken from an object with a known position, such as a
landmark, to determine the ship's location. A type of running fix. |
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bow - The front of the boat. |
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Bowditch - A reference book
named after the original author, Nathaniel Bowditch. Updated versions
contain tables and other information useful for navigation. |
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bowline - A knot used to
make a loop in a line. Easily untied, it is simple and strong. The
bowline is used to tie sheets to sails. |
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bowspit -
spar projecting from the bow.
a short spar extending forward from the bow. Normally used to
anchor the forestay.
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brace - A guy. A line used
to control the movement of the object at the other end, such as a spar. |
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breakers - A wave that
approaches shallow water, causing the wave height to exceed the depth of
the water it is in, in effect tripping it. The wave changes from a
smooth surge in the water to a cresting wave with water tumbling down
the front of it. |
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breast line - A line
attached laterally from a boat to a dock, preventing movement away from
the dock. |
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bridge - 1 - The room from
which a ship is controlled. On a smaller boat this is usually not a
room, is outside, and is known as a cockpit. 2 - A man made structure
crossing a body of water, usually for the use of automobiles or train. A
boat intending to pass under a bridge needs to make sure it has
sufficient vertical clearance unless it is a swinging bridge or a
drawbridge. |
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brightwork - Pieces of wood
trim and also any polished metal on a vessel. |
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broach to - An undesirable
position in which a vessel is turned to expose its side to the oncoming
waves. |
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broaching - The unplanned
turning of a vessel to expose its side to the oncoming waves. In heavy
seas this could cause the boat to be knocked down. |
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broad on the beam - The
position of an object that lies off to one side of the vessel. |
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bulkhead - An interior wall
in a vessel. Sometimes bulkheads are also watertight, adding to the
vessel's safety. |
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burgee - A type of flag used
to identify a boater's affiliation with a yacht club or boating
organization. |