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FMTC Nautical Terms

        Help!  

Term
Definition
Abaft   Behind. At or near the stern. Aft of amidships. On the after side of.  
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Abaft the beam   Bearing more than 90 degrees from dead ahead.  
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Abandon ship   Leave the boat with no intention to make further efforts to save or preserve her.  
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Abate   when the force of the wind lessens.  
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Abeam   Directly off the side of the boat. At right angles to the fore and aft line  
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Aboard   On or in any vessel or boat. On board  
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Abreast   Side by side  
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Adrift   Floating free without propulsion. Floating on the tide unsecured.  
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Aft   Towards, at, or near the stern.  
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Aground   The state of a vessel part which is touching the bottom. Held fast on the bottom.  
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Ahead   Forward of, Advance. In the direction of the bows.  
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Ahoy   The general nautical hailing term to attract attention.  
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Alpha   the letter "A" in the phonetic alphabet  
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Amidships   A helm order to put the wheel or tiller so that the rudder is fore and aft. To steer dead ahead  
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Anchor   Device that digs into the sea bottom to prevent the boat from drifting  
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Anchorage   The place where a boat, or boats, may anchor  
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Anchor's aweigh   The report from the bow that the anchor has been hove out of the ground, is off the bottom with its weight taken by the chain and rode.  
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Annual variation   The inconsistency in the earth's magnetic force that causes a change in the variation of the magnetic compass; the difference may be found printed printed on charts as increasing or decreasing so much annually  
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Anti-fouling   Paint on the bottom of a boat that reduces marine growth.  
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Astern   Behind. Backwards. In the direction of the stern. Outside and abaft of the vessel  
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At anchor   A vessel riding by its anchor.  
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ATON's   Aids To Navigation  
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Avast   Said of anything where the sea, or water, is just washing over it. Level with the surface of the water, or just under it.  
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Aweigh   Off the ground with weight taken by supporting ropes, cable, or chain  
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Aye-aye sir   The verbal acceptance of an order  
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Back   The keep of a boat.  
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Back splice   Used to prevent the ends of a rope from unlaying  
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Bail   Remove water from a boat by hand, or with a baler  
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Ballast   Weight low in the hull to improve stability  
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Bank   An area of the seabed that raised above the surrounding ground  
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Bar   The silting-up of deposit or shallowing formed near the entrance to harbor or inlet  
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Barometer   Instrument that measures atmospheric pressure which determines changes of weather  
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Batten Down   Close openings and secure gear  
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Battery   Source of direct current (DC) for electronics  
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Beached   Said of any vessel that has run ashore or is placed there for any reason, or of a mariner who retires to live ashore.  
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Beacon   An artificial warning mark to aid navigation  
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Beam   The breadth of a vessel at her widest part. Extreme width. Straight out from the side of the boat, at ninety degrees from either side of dead ahead.  
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Beam sea   A sea rolling in at right angles to the vessels course.  
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Beam Wind   A wind blowing in at right angles to the vessels course  
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Beamy   Anything of excessive, or unusual beam. An unusually wide boat.  
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Bearing   The direction of one object from another. It may be given as true, magnetic, or relative to the vessel's  
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Beaufort wind scale   A table used at sea to classify the various wind forces and their speeds, their descriptions being denoted by the use of numbers (force 7, force 9)  
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Belay   Make fast a rope around a belaying pin or cleat. An order to cease what one is doing, or to cancel an order  
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Bell buoy   A buoy containing a bell that is rung by the motion of the sea.  
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Below   Between decks. Going deblow is descending from the upper deck  
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Berth   Any place in a harbor allotted for the accommodation of a vessel. Place a vessel in any allotted position. A sleeping space or specified cabin in any vessel.  
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Bilge   Lowest area inside the boat. Absolute nonsense  
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Bimini Top   Canvas canopy  
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Binnacle   Top mount remote control  
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Blocks   Pulleys inside a frame, used a gain a mechanical advantage or to lead a rope in any required direction. It is measured by the length of its shell  
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Blowers   Fans that remove dangerous vapors from the engine compartment  
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Boathook   Pole with a blunt hook used for extending ones reach  
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Boom   Horizontal post of the main sail  
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Bow   Front of the boat  
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Bow Eye   Towing loop secured at the bow  
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Bow Line   Rope that attaches the front of the boat to a dock  
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Bowline   A know used to tie a loop in the end of a line  
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Bowsprit   A spar projecting from the bow of a sailing vessel, to which the headsails are secured  
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Bravo   The letter "B" in the phonetic alphabet  
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Breakwater   Artificial harbor. A protective barrier erected across a deck to break the force of any seas that are shipped  
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Bridge   Cockpit (control station)  
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Broach   Broadside to the waves  
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Broad On/Off   45 degree angle to front/back  
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Bulkhead   Vertical partition maintaining rigidity in construction and dividing a vessel into watertight compartments.  
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Buoy   Floating navigation aids  
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Buoyancy   Ability to float, expressed in positive or negative. A boat has positive buoyancy, a rock has negative  
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Burgee   Flag identifying ownership or membership  
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Can   Green cylindrical buoy  
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Capsize   Upside down in the water  
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Cardinal Points   North, South, East, West  
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Cast Off   Unfasten for departure  
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Catamaran   Boat with two hulls  
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Caulking   Any substance used for sealing between the seams of planking to make them watertight  
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Cavitation   Turbulence caused by a propeller blade spinning too fast and creative low-pressure bubbles  
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CDMVT   Angle conversion process from Compass to True Direction (+East)  
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Celestial Navigation   True direction as opposed to Magnetic or Compass  
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Chafe   Rub or wear away by constant use or friction  
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Chafing gear   Protection applied to prevent chafing  
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Chandlery   Shop where nautical gear is sold  
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Channel   The deepest part of a passage through which the main current flows.  
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Charlie   the letter "C" in the phonetic alphabet  
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Chart   relevant data, represented on and as a map, and used for navigational purposes.  
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Chine   Juncture of the side and the bottom of boat  
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Chop   Waves that are short and steep  
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Cleat   Fitting with arms used to fasten lines  
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CO Monitor   Carbon Monoxide warning device. Used in enclosed areas on boats with gasoline engines  
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Cocked hat   The small triangle indicated on a chart when three lines of position are supposed to meet, but do not quite do so. The enter of the triangle becomes the position fix  
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Codline   Small line used for many handy purposes, such as lacings, ornamental knots, quick tie down of small items...etc.  
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COG   Course Over Ground, the course in the water adjusted for current and wind  
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Combined Seas   Wave height that is the sum of the swells plus the wind wave  
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Common whipping   Used to bind the end of to prevent it from unlaying and fraying  
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Companionway   Entrance between the deck and the cabin  
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Compass   Direction finding instrument using the Earth's magnetic field  
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Compass bearing   the position of any object observed, as indicated by the compass  
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Compass rose   A graduated circle printed on a chart for use as a reference for showing true and magnetic north  
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Complain   A ship is said to do this when she is creaking  
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Constant bearing   A bearing that remains the same, even though the ship is moving; If of another ship, it indicates a collision course  
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Course   Direction laid from point to point. The boat maintains a heading to stay on course  
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Cowl   Air Scoop  
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Crest   Wave top  
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Cross bearings   A simultaneous observation of two separate objects, the bearings of which are then laid on a chart to fix the ships position  
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Cuddy   A small cabin in the front of a boat  
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Current   Horizontal movement of water; set is its direction and drift is its speed. The flow of electricity  
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Danforth   The brand name of a type of anchor  
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Davit   The metal supports from which boats are hoisted or lowered, usually erected in pairs and swung into  
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Davy Jones   The evil spirit of the sea  
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Davy Jones locker   The bottom of the sea, common graveyard of everything thrown overboard, the grave of men drowned at sea, adn of ships that have foundered  
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Dayboard   Navigation aid for day use  
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Dead calm   A flat sea with no sign of moving currents  
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Dead reckoning   A contraction of deduced reckoning, being the estimated position of a ship based on time, speed, and distance calculations as opposed to plotting an observed position  
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Dead slow   The minimum speed possible to retain steerageway  
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Deck   The floor of a boat  
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Delta   The letter "D" in the phonetic alphabet  
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Deviation   Compass error caused by its proximity to magnetic disturbances  
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Dinghy   A small, open rowboat used for all utility purposes, mainly for transport to and from the main vessel. May be able to accommodate a small outboard motor  
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Direction   Relative position of two points using three-digit numbers  
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Displacement   Weight of the water displaced by a boat  
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Distress   A state of danger requiring assistance  
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Dividers   An instrument with two movable points, used in chart work  
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Dock   An artificial enclosure for the berthing and retention of ships of any purposes. It may be wet, dry, floating or stationary.  
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Documented Vessel   Boat registered with the USCG instead of a state  
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Dodger   Canvas enclosure on a sailboat  
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Dog   A clip used for closing watertight door or hatches  
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Draft   Depth of boat below waterline  
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Dredge   Removal of accumulated runoff in waterways  
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Drift   To float unsecured with the tide. The speed of the current  
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Dumping   Legal or illegal release of garbage into the water  
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Ease off   Slacken a rope gradually. Loosing any tight fitting  
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Easting   The distance gained to Eastward  
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Echo   The letter "E" in the phonetic alphabet  
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Eddy   Circular water movement caused by current passing an obstruction or a counter current  
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Ensign   The distinguishing flag used to indicate nationality, usually flown at or near the stern  
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Entrance   The shape of the forepart of a vessel  
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Estimated Position, EP   The position on a chart at which a vessel may be estimated to be at any time after allowances have been made for ides, winds, and courses laid off  
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EPIRB   Emergency Position Indicating Radio Beaconis a distress beacon used by mariners worldwide to alert Search and Rescue (SAR) forces that they are in distress.  
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Equator   An imaginary circle around the middle of the earth. Zero degrees latitude  
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Even keel   Upright. Without a list. Drawing a similar depth of water fore and aft.  
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Fall astern   Drop back. Reduce speed and get astern of another vessel  
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Fathom   A measurement equivalent to six feet applied to rope for their length, and to depths.  
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Fenders   Cushions that protect the sides of the boat  
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Fetch   Area in which ocean waves are generated by the wind.  
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Fix   to ascertain the position of the boat by the intersection of any two or more bearings taken at the same time  
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Flame Arrester   Backfire Flame control devices requires on gasoline engines  
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Flare   A pyrotechnic distress signal. The curve of the freeboard from the bows, upward and outward, providing additional rising surface to oncoming waves.  
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Fleur De Lys   The decorative North point as printed on compass cards and compass roses  
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Flood Tide   Tidal current toward the land (rising level)  
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Flotsam   Goods lost by shipwreck, or anything that has gone overboard and is later found floating at sea  
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Fluke   Anchor component that digs in  
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Flying bridge   A small helm station located on the uppermost deck  
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Flying Dutchman   The phantom sailing ship that traditionally haunts the seas off the Cape of Good Hope  
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Fog   The limited visibility state generated when the temperature and dewpoint are within 4 degrees F of each  
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Fog horn   The apparatus used for signaling during periods of reduced visibility.  
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Following Sea   Waves coming from behind the boat  
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Fore   In, towards, or of the foremost part of any vessel.  
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Foul   Describes anything that will not run clear, becomes entangled, forms an obstruction, collides, or prevents free passage.  
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Fouled anchor   The term used when the anchor rode is entangled around the flukes of an anchor  
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Founder   Fill with water Go to the bottom Sink  
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Fox-trot   the letter "F" in the phonetic alphabet  
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Freeboard   Height of boat above the waterline  
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Freshen   when the wind increases in strength  
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From stem to stern   From one extreme end to the other. The maritime equivalent of bumper to bumper.  
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Fronts   Weather boundaries  
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Gale   A strong wind between a stiff breeze and a hurricane  
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Galley   Kitchen  
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Gangway   Walkway between a boat and the dock  
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Gear   Personal baggage  
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Generator   Motor that produces alternating current  
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Ghosting   Under sail and making way, when there seems no wind  
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Gimbals   Rings that enable a compass or stove to remain level  
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Give way vessel   A vessel, whose duty it is to keep clear of another by taking necessary action  
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Golf   The letter "G" in the phonetic alphabet  
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GPS   Global Positioning System; U.S. military satellites that broadcast signals for receivers to determine exact position of earth  
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Ground Tackle   Anchoring equipment  
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Gunwale   Juncture of the top and the side of boat  
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Hail   Call to another vessel  
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Half-tide   The mean level of the sea during springs or neaps; it is therefore a constant factor  
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Halon   Fire extinguishing material using in engine compartments  
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Halyard   Roped used for hoisting and lowering flags, sails, etc  
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Harbor   An area of water partially enclosed  
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Hard chine   A feature of a boat in which the topsides and bottom meet at an angle rather than curving to a round  
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Hatch   Opening in deck to the area below  
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Haul   Pull on a rope.  
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Hawespipe   A pipe fitted to the deck that allows rope, cable, or chain to pass through  
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Haven   An inlet from a coastline where ships may anchor and shelter  
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Head   Toilet/Bathroom  
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Head sea   Waves approaching from the front of the boat  
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Heading   Direction the boat is pointed  
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Headway   A vessel is said to make headway when she advances, bows first, and begins to make way  
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Heave   Vertical motion of the boat due to waves A command to lift or pull together  
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Heave To   Stop, trim sails, or work the engine so as to keep the vessel almost stationery.  
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Heel   Leaning to the side  
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Helm   The steering console or station  
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High tide   The greatest elevation of a tide at a certain place.  
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Hitch   Knot used to attach to an object  
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Hold   A special compartment or space used for stowing cargo  
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Holding Tank   Storage tank for sewage  
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Holidays   Bare patches missed when painting or patching  
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Hook   The anchor  
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Hotel   The letter "H" in the phonetic alphabet  
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Hove to   Underway, but not making way through the water  
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Hull   Lower part of the boat in contact with the water that provides buoyancy  
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Hull down   Said of a vessel beyond the horizon, with only its masts in view  
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Hypothermia   Inability to maintain sufficiently warm body temperature  
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India   The letter "I" in the phonetic alphabet  
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Inlet   Narrow waterway from the ocean to an inland bay  
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Isobar   A line drawn to link areas of equal barometric pressure  
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Jetsam   Goods thrown overboard to lighten a vessel  
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Jetty   Structure projecting out from the shore  
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Jib   The foremost sail in a sailing vessel, triangular in shape, and set between the foremost and the bowsprit  
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Jibe (Gibe)   Sailing maneuver with the stern into the wind  
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Jonah   Anyone reputed to bring misfortune or disaster.  
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Juliet   The letter "J" in the phonetic alphabet  
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Jury rig   A temporary setup used until permanent repairs can be made  
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Keel   The solid beam running the length of the lowest part of the hull.  
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Killick   A small anchor. A large stone or weight used for anchoring  
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Kilo   The letter "K" in the phonetic alphabet  
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Knot   Mechanism to secure a rope The equivalent of one nautical mile per hour  
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Labor   Pitch and roll in heavy seas, show signs of working  
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Lading   vessels cargo  
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Laid up   Refers to the way strands are wound together to make up a rope. A ship not in commission In bed, sick, or injured  
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Landfall   Approaching land, especially after a long voyage  
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Landlubber   A man of the land who is uninitiated as to the ways of nautical matters  
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Landmark   A conspicuous spot onshore used as a navigational aid  
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Lanyard   Length of rope fastened to an object  
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Lateral Buoyage   System of red and green buoys that mark the edges of navigable channels  
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Latitude   Degrees :Minutes:Seconds (0-90) North/South of the Equator  
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Lay to   Stop by keeping into the wind  
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Lee shore   The shore facing the lee side of a ship, being that on to which the wind would driver her if she were unable to make an offing  
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Leeward   Downwind side, sheltered from the wind.  
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Let fly   Let the sheet go, suddenly spilling the wind from a sail  
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Lima   the letter "L" in the phonetic alphabet  
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Line   Rope  
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List   Continuous lean to one side  
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LOA   Length Over All, the primary dimension of a boat  
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Log   Device for measuring distance through the water  
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Longitude   Degrees:Minutes:Seconds (0-180) East/West of the Greenwich Meridian  
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Lookout   A person specially posted to keep a diligent watch, to observe and report all that come into view  
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Mackerel sky   A sky with long white streaks of cloud, often a portent of impending rain  
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Magnetic bearing   The bearing of an object in relation to the magnetic compass  
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Magnetic compass   A ships standard compass  
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Magnetic course   A course as read from the magnetic compass rose on the chart  
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Magnetic North   The northern center of the earths magnetic influence, as opposed to True North. It is approximately located at 70 degrees North and 97 degrees 30 minutes west in arctic Canada  
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Maiden voyage   The first trip of a new vessel  
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Make fast   To secure  
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Make headway   to advance through the water  
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Make way   boat moving under its own power  
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Man overboard   The alarm called by anyone who sees someone fall over the side into the water.  
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Mare's tails   White feather-shaped wisps of clouds; they often indicate an increase of wind if they gather into a regular formation.  
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Marina   Docking area usually with services  
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Marlinspike seamanship   the term embracing knotting, splicing, seizing, etc...; the art of shaping and working ropes.  
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Mast   Vertical post on sail boats  
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Mayday   Emergency distress call  
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Meridian   A line that will cut through the equator at right angles and run from pole to pole  
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Metal Mike   auto pilot  
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Mike   the letter "M" in the phonetic alphabet  
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MLLW   Mean Lower Low Water, reference level used for depth measurements on nautical charts in the USA  
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Mooring   Buoy used by boats to tie up  
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Morse Code   Nearly obsolete means of nautical communication using "dots" and "dashes"  
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Nautical Mile   one minute of latitude roughly equal to 1.15 statute miles  
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Neap tides   those with smaller range than spring tides; not as high, low, or rapid  
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NOAA   National Oceanic and Atmospheric Administration, reports weather and tidal information  
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November   the letter "N" in the phonetic alphabet  
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Nun   A red, even-numbered, cylindrical shaped buoy marking the right side of a channel as you return to port. Cone top  
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Observed position   A vessels position plotted on a chart from the observation of objects, as opposed to dead reckoning  
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Occulting light   such a light that is on more than off  
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On the beam   At right angles to the fore and aft centerline of a ship. Directly off the side of the ship  
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On the bow   Within the angle from right ahead to 45 degrees on either side  
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On the quarter   On a bearing midway between the beam and the stern  
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Oscar   the letter "O" in the phonetic alphabet  
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Out of trim   with a list, down at one end, Untidy  
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Outboard   Outside the ship or boat,Farther towards a ships side. A portable, self-contained propelling unit, secured to the transom of small boats.  
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Overboard   Over the side and into the water  
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Overtaking vessel   Any vessel approaching another from within an arc prescribed from her stern light; it is her duty to keep clear while the other vessel stands her course and speed.  
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Painter   The rope at the bow of a small boat for making it fast.  
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Papa   the letter "P" in the phonetic alphabet  
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Passage   A long voyage from one place to another  
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Pay Out   Slacken and ease a rope so that it runs freely  
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Pennant   A long narrow banner, or triangular shaped flag. A short length of rope with a metal thimble in each end,one of which is often hooked to a tackle.  
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PFD   personal flotation device (life jacket)  
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Phonetic Alphabet   system used to identify letters in verbal communications  
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Pier   Structure extending into the water for tying a vessel to  
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Piling   Vertical post in the water  
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Pilot   A person licensed to navigate ships through channels and fairways  
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Pilot boat   Used by pilots for meeting ships  
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Pilot house   The wheel house  
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Piloting   Navigating a boat by determining position and directing movement  
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Pitch   The depression of the bows plunging into a trough in the sea The theoretical distance a propeller travels in one revolution.  
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Pitch pole   Be ended up, stern first, and be completely overthrown by the sea  
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Planing   when a boat is moving through the water with bows lifted well clear and more out of the water than in  
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Planing Hull   Power boat that eliminates the bow wake  
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Plastic boat   Derogatory term for a fiberglass boat  
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Points of a compass   There are 32 points of a compass consisting of 4 cardinals (N,S,E,W), 4 half cardinals (NE,SE,SW,NW), 8 intermediates (NNE,ENE,ESE,SSE,SSW,WSW,WNW,NNW) and 16 by points  
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Pontoon   Any large tank used as a platform  
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Poop   The raised deck on the after part of a ship  
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Pooped   When a sea breaks over the stern when running before a wind or sea  
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Port   Left side of a vessel. A seaport, that part of any place that is made available for shipping  
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Port Tack   Sailing "give way" with wind from the left side  
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Porthole   An opening in the ships side to let in light and air  
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Poseidon   The god of the sea in Greek mythology  
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Positive buoyancy   the quality possessed by any craft that would remain afloat when waterlogged  
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Pram   A small dinghy with a cut off bow, or foward transom, used as a tender to larger boats  
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Prevailing Wind   Typical direction of the wind at a locale  
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Prime meridian   the meridian which passes through greenwich, and from which longitude east or west is reckoned  
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Prohibited area   An area marked on a chart, where anchoring, trawling, or fishing may be forbidden by authority  
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Prolonged blast   A blast of the horn of 4-6 seconds duration  
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Prop walk   Sideways force created by a spinning propeller  
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Propulsion - Diesel   Engine that runs by compressed combustion  
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Propulsion - Gasoline   Engine that runs by sparked combustion  
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Pulpit   An elevated tubular metal guardrail set up at the bow or stern; typically extending from the bow  
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Purse Seine   A seining net which can be closed like a purse  
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Quarter   The side of the ships between the beam and the stern  
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Quartering   Sailing with the wind coming over the quarter  
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Quartering wind   Wind that comes from the ships quarter  
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Quay   Docks used to load/unload cargo  
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Quebec   The letter "Q" in the phonetic alphabet  
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Race   A strong current that disturbs water over a large area  
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Radar   System that uses the transmission/ reflection/ reception of radio waves to determine distance, direction, and size of an object  
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Rake   The angle of backward inclination of a ships masts or funnels. The slope of a bow or stern beyond the keel ends  
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Range   Distance away of an object The difference between the depth of water at high and low tides  
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Reach   A long straight part of a waterway, or distance between two bends in a river.  
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Red-Right-Returning   RED buoys on the RIGHT when RETURNING from the sea  
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Reef   to reduce sail area by folding, rolling, or tying up part of the sails. A chain of rocks lying submerged near the surface  
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Refitting   A period during which repairs, reconstruction, and replacements are effected  
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Regatta   A program of sailing and rowing races arranged by an authority or club  
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Reserve buoyancy   Those compartment above water level that may effectively be made watertight  
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Rigging   Sailing ropes and hardware  
🗑
rip tide   A running tide, rising as it flows, and breaking in ripples  
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Rode   Anchor rope and/or chain  
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Roll   Vertical motion from side to side  
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Romeo   the letter "R" in the phonetic alphabet  
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Rudder   Movable fixture in the water that provides steering  
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Rules of the Road   Navigation guidelines  
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Running Lights   Red, Green, and White lights used by boats at night  
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Scope   Anchoring length to depth ratio  
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Screw   Propeller. A type of fastener, usually metal similar to a bolt.  
🗑
Scuppers   Holes cut in bulwarks for water to escape overboard from decks  
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Scuttle   To sink a ship by cutting holes in her  
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Sea anchor   Any kind of drogue, used as a floating anchor for a vessel to ride to, head to wind, if hove to in bad  
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Sea legs   Possessed by those who have the ability to walk about on a vessel pitching and tossing about in heavy seas  
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Sea room   The area around a ship clear of obstructions and of land  
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Sea State   open water conditions resulting from wind and water activity  
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Seacock   Hole in hull with a valve to regulate the water flow  
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Set   The direction of the current.  
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Sextant   Navigation instrument for measuring angles  
🗑
Shackle   Metal linkage typically used to connect rope to an anchor  
🗑
Sheer   Curve of the deck as viewed from the side  
🗑
Sheet   Rope that controls a sail's horizontal movement  
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Ship   Boat longer than 20 meters. To receive anything onboard  
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Ship oars   Place oars in crutches or oarlocks ready to use  
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Shoal   A place where water is not deep and endangers navigation  
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Shore Power   Electrical power (AC) via cables provided at the marina as opposed to the engines or a generator  
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Shrouds   Wires that run to the side of the boat to support the sail mast  
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Side lights   The red and green navigation lights required by the Rules of the Road, fixed to show from right ahead to two points abaft the beam  
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Sierra   the letter "S" in the phonetic alphabet  
🗑
Slack Water   Tidal period between flood and ebb tides  
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Sling   Hoist that lifts a boat out of the water  
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Slip   Berth with docks on 3 sides  
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Small Craft Advisory   Winds to 33 knots and/or dangerous sea conditions for smaller boats  
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Snub   Suddenly check anything that is running out  
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SOG   Speed over ground, the speed in the water adjusted for current wind  
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Sounding   A depth reading  
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Spars   Poles used in sail rigging  
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Spindrift   Spray whipped off and blown from the crests of waves  
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Splice   Join two ropes together by interweaving the braids  
🗑
Spring Line   Rope between the boat and the dock to limit forward/reverse motion  
🗑
Spring Tide   Tide at which the range between high and low is greatest. could occur when sun, earth, and moon ar in line or nearly  
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Squall   Sudden violent windstorm  
🗑
Stanchion   A fixed upright pillar support between decks or for guardrails, awnings, etc  
🗑
Stand on vessel   that vessel which maintains course and speed  
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Starboard   the right hand side of the boat when facing forward  
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Starboard Tack   Sailing "right of way" with wind from the right side  
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Stateroom   A large cabin formerly described as being set aside for the owner, but now referenced to an increased level of luxury and comfort  
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Stays   Wires that run to the front and rear of the boat to support the sail mast  
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Steerageway   Sufficient motion to support steering  
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Stem   The timber at the bow of a ship into which the planks are butted. The points at which both sides of the bow meet  
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Stern   Back of boat  
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Stern Line   Rope that attaches the back of the boat to a dock  
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Stores   Food and supplies  
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Storm Surge   Rising sea preceding a storm  
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Stove in   Damaged by anything breaking through into a ship  
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Stow   TO put in its proper place  
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Superstructure   Structures above the deck  
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Swamp   Waves coming into the boat  
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Sway   Horizontal motion of the boat due to waves  
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Swells   Long waves from a distance that do not crest  
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Swing   as she is tied to a mooring or at anchor and moves to changing winds or tides  
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Swing a compass   Ascertaining deviations for calibrations of a magnetic compass  
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Tack   To maneuver toward the wind by continually altering course back and forth so as to take the wind at an angle rather than dead on  
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Tackle   Assemblage of ropes and blocks  
🗑
Taff rail   The rail at the stern of a ship  
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Tango   the letter "T" in the phonetic alphabet  
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Tender   Accommodate larger outboards.  
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Tide   Water Depth variations created by the gravitational forces of the Moon and the Sun  
🗑
Topsides   The upper part of the hull above the waterline  
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Trade winds   Persistent tropical winds that blow from the subtropical high pressure towards the equatorial low pressure  
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Transom   Vertical partition at the back of the boat  
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Trim   The difference in draft between forward and aft. The set of a vessel on the water. The set of a sail used for best advantage  
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Trim Tabs   Adjustable planes at the stern that allow the pilot to adjust the trim of the boat  
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Trip Line   Rope to the anchor crown used to mark its place and assist in pulling when stuck  
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Trough   Low point between waves  
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Turn turtle   To turn over completely  
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TVMDC   Angle conversion process from True to compass direction (+ West)  
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Twin screw   A vessel with two propellers on separate shafts  
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Underway   Not tied to the dock  
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Uniform   the letter "U" in the phonetic alphabet  
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USCG   United States Coast Guard  
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Variation   The angle between True North and magnetic North; it varies in different parts of the world and may be either easterly or westerly  
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Veer   Change direction as does the wind  
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Ventilation   Turbulence caused by a propeller blade spinning too close to the surface and creating air bubbles  
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VHF   Very High Frequency  
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Victor   the letter "V" in the phonetic alphabet  
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Voyage   Complete trip with multiple passages  
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Wake   Waves formed by the passing of a vessel through the water  
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Wash   The turbulent water left behind by any vessel passing through the water  
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Waterline   The top edge of the bottom color paint where it meets the topside color. The line to where water rises  
🗑
Wave Height   the average of the highest third of all waves in an area  
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Waypoint   Position saved in a GPS receiver  
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Weigh   to raise an anchor or depart  
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Wharf   Structure parallel to the shore  
🗑
Whiskey   the letter "W" in the phonetic alphabet  
🗑
Wind waves   Waves created locally by the wind  
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Windlass   Anchor winch  
🗑
Windward   Upwind side  
🗑
X-ray   the letter "X" in the phonetic alphabet  
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Yacht   Boat used for recreation with luxury features  
🗑
Yankee   the letter "Y" in the phonetic alphabet  
🗑
Yaw   Horizontal motion from side-to-side  
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Zinc Anodes   Plates that protect a boat's underwater metals from galvanic deterioration  
🗑
Zulu   the letter "Z" in the phonetic alphabet  
🗑
Mal De Mer   Sea sickness  
🗑
ABYC   American Boat and Yacht Council  
🗑
A/C   abbreviation for air conditioner  
🗑
AC   A man made, not naturally occurring electric current that reverses its direction many times a second at regular intervals. Abbreviation for alternating current  
🗑
after   further aft; sternwards  
🗑
anchor light   a light that can be seen by another vessel from a 360 degree view, visible from at least 2 miles away  
🗑
Anemometer   A device that measures wind speed.  
🗑
Appendage   Structures extending beyond the main hull. They include items like shafting, rudder, bossing, struts, davits, outriggers, and bilge, keels.  
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Athwartship   From one side of the boat to the other. Across the boat  
🗑
Autopilot   Equipment used on ships and boats to maintain a chosen course without constant human action  
🗑
Bight   A bend or curve in the shore of the sea or river.  
🗑
Bitter End   The inboard end of a line or anchor chain or cable secured to the vessel.  
🗑
Boot top   The area between the water lines of a ship when fully loaded and when unloaded  
🗑
Catalyst   A chemical that activates a chemical reaction with another chemical  
🗑
Cat Boat   Normally used to describe a twin hull power boat. Also a type of small sailing vessel  
🗑
Cavitate   to form cavities or bubbles, usually in reference to a propeller or impeller  
🗑
Centerline   An imaginary line down the middle of the boat from the center of the bow to the center of the stern  
🗑
Chain   A series of usually welded metal links or rings connected to or fitted into one another and used for various purposes.  
🗑
Chock   Fitting through which anchor or mooring lined are led  
🗑
Class   Boat Size Classifications & Requirements Class A. Boats measuring less than 16 feet. Class 1. Boats measuring more than 16 feet but less than 26 feet. Class 2. Boats measuring more than 26 feet but less than 40 feet.  
🗑
Carbon Monoxide (CO)   Found in fumes produced any time you burn fuel. Very little odor and deadly in confined spaces such as the cabin of a boat.  
🗑
Cockpit   Commonly, in a boat, this refers to the outside working or seating area below the deck surface. Not below deck  
🗑
Control line   Navigation line from point a to point b. Also a line tied to a vessel being lifted by a crane to help prevent unwanted movement.  
🗑
Control Signals   Include sound signals, light signals, dayboards, and aids to navigation (ATON).  
🗑
Cowling   A cover for an outboard motor. Also includes the lower motor cover.  
🗑
Crew   On leisure vessels, they are the people not driving the boat.  
🗑
Direct Current (DC)   is the unidirectional flow of electric charge.  
🗑
Depth Sounder   A device that measures the depth of the water; as in  
🗑
De-Rigging   the removal of equipment or rigging. our customary derig of cables.  
🗑
Electric Hazards   A dangerous condition where a person could make electrical contact with energized equipment or conductor, and from which the person may sustain an injury from electric shock.  
🗑
Environmental Awareness   Being aware of your surroundings, and the affect your actions have on them  
🗑
Fiberglass   a reinforced plastic material composed of glass fibers embedded in a resin matrix.  
🗑
Fore and Aft Line   separates starboard from port  
🗑
Foward   Toward the bow; as in: Go forward to throw the bow line.  
🗑
Fouled Bottom   To encrust with a foreign substance a boat’s bottom fouled with barnacles.  
🗑
Gel Coat   The smooth, hard surface layer of polyester resin in a fiberglass structure.  
🗑
GMT   Greenwich England where time stops  
🗑
Grab rail   To give support to hold on to, usually stainless  
🗑
Gust   A sudden breeze of wind, or a brief storm.  
🗑
Hard Over   This is when you turn the steering wheel all the way over to the port or starboard.  
🗑
Helmsman   a person who steers a ship or boat.  
🗑
Hin   Hull Identification Number  
🗑
Hull Speed   The maximum speed achieved by a non-planing hull  
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ICW   Intracoastal Waterway  
🗑
Impeller   The rotating part of a centrifugal pump, compressor, or other machine designed to move a fluid by rotation.  
🗑
Inboard   An inboard motor is a marine propulsion system for boats. As an inboard motor is an engine enclosed within the hull of the boat, usually connected to a propulsion screw by a driveshaft.  
🗑
Kilometer   1000m. a metric unit of measurement. One km is equal to about 0.6 mi  
🗑
Locker   A small compartment below deck or chest used for storage  
🗑
Lubbers line   A lubber line is a fixed line on a compass pointing towards the front of the boat and corresponding to the craft's centerline  
🗑
Midships   In the middle of a ship  
🗑
Monkey fist   Type of knot, has the name because it looks like a bunched fist. To serve as a weight making it easier to throw the line.  
🗑
Monohull   A monohull is a type of boat having only one hull, unlike multihulled boats which can have two or more individual hulls connected to one another.  
🗑
Moor   A boat is secured to a mooring by lines to prevent free movement of the boat on the water.  
🗑
Moored   A boat is moored by attaching it by cable or rope to the shore or to an anchor.  
🗑
Multihull   a boat with two or more hulls, especially three.  
🗑
MSD   A Marine Sanitation Device, commonly known as an “MSD” is a piece of machinery or a mechanical system that is dedicated to treat, process, and/or store raw, untreated sewage that can accumulate onboard water vessels.  
🗑
Navigation Lights   A set of lights shown by a ship or aircraft at night to indicate its position and orientation, especially with respect to other vessels.  
🗑
Navigation Rules   To give direction to vessels in order to set a standard that everyone could follow in order to prevent collisions of two or more vessels.  
🗑
Negative Buoyancy   When an object goes to the bottom of the water column.  
🗑
Offshore   situated at sea some distance from the shore  
🗑
Outdrive   The part of an inboard/outboard motor that is outside the hull providing steering and propulsion.  
🗑
Pedestal   The base or support (usually used for seats on a boat) where a column is mounted.  
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Plug   A rubber and/or metal plug used to stop the flow of water through the boats drain hole, and removable for towing, dry docking and water drainage.  
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Professional   A person engaged and qualified in a profession  
🗑
Propeller   A mechanical device for propelling a boat, consisting of a revolving shaft with 2 or more broad angled blades attached to it.  
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Pump Out   To empty your boats onboard sewage and waste tanks. Pump out stations are available at most marinas.  
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PWC   Personal Watercraft  
🗑
Rafting   The act of letting current or flow of the water carry your watercraft.  
🗑
Reciprocal   A bearing differing by 180°, or measured in the opposite direction from a given bearing.  
🗑
Rig   The wires and harnesses running through the boat and to the engine(s).  
🗑
Right of Way   The legal right of a watercraft to proceed with precedence over others in a particular situation or place.  
🗑
Rope   A length of strong cord made by twisting together strands of fibers  
🗑
RPM   The number of revolutions in one minute.  
🗑
Rub Rail   A metal/rubber rail to protect against rubbing on the docks to avoid damage to the boat.  
🗑
Sailor's Code   Code used by sailors on the water to communicate over radio waves and by other means. Also unwritten rules to follow while on the water.  
🗑
Sea Conditions   The condition on the surface of a body of water correlating to waves at a certain place and time.  
🗑
Secure   To fasten an item to tie something down to keep it in place.  
🗑
Self Bailers   A device that is used to remove water from the boat  
🗑
Self Bailing   A one way valves that allow water to exit the boat but not enter.  
🗑
Self Reliance   Reliance on one's own powers and resources rather than those of others.  
🗑
Self Rescue   The act of being able to help or save yourself by being prepared and responsive in dangerous situations.  
🗑
Shear Pin   A pin that is installed between the propeller and the propeller shaft designed to break in case of impact to protect the prop and drive components.  
🗑
Skeg   The lowest part of a sterndrive or outboard lower gearcase. A tapering or projecting stern section of a vessels keel, which protects the propeller and supports the rudder.  
🗑
Skipper   The operator of the vessel  
🗑
Statute Mile   A UNIT OF LINEAR MEASURE EQUAL TO 5,280 FEET, OR 1,760 YARDS (APPROXIMATELY 1.609 KILOMETERS).  
🗑
Steering System   boat's steering wheel is part of the helm that connects to a mechanical, electric, or hydraulic system to assist in turning the boat. consist of a wheel, helm, steering cable, and cable connections, all linking the wheel to the engine.  
🗑
Sterndrive   AN INBOARD ENGINE CONNECTED TO AN OUTBOARD DRIVE UNIT AT THE REAR OF A POWERBOAT  
🗑
Strakes   Are longitudinal ridges, Their purpose is usually to deflect spray, lift the hull, and sometimes to stiffen the hull.  
🗑
Stuffing Box   provide a watertight seal for the propeller shaft.  
🗑
Survey   An inspection of your boat for damage and condition.  
🗑
Surveyor   is a person who conducts inspections, surveys or examinations of marine vessels to assess, monitor and report on their condition and the products on them, as well as inspects damage caused to both vessels  
🗑
Swim Platform   A wide platform at the transom equipped with a ladder to help ease the effort of reboarding after going into the water.  
🗑
Tachometer   is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine.  
🗑
Tensile Strength   THE RESISTANCE OF A MATERIAL TO BREAKING UNDER TENSION.  
🗑
Thimble   a metal ring with a concave groove on the outside, used to line the outside of a ring of rope forming an eye.  
🗑
Thru Hull   a term used to describe a fitting that is attached through the Hull of a Boat. requires a hole to be cut/drilled in the boats Hull for the fitting to pass through.  
🗑
Tidal Current   THE WATER CURRENT CAUSED BY THE TIDES  
🗑
Tiller   can be used by the helmsman directly pulling or pushing it, but it may also be moved remotely using tiller lines or a ship's wheel.  
🗑
Tiller extension   Stand while keeping a hand on the tiller,  
🗑
Toe rail   Guardrail on a boat or yacht, some inches high located at the outboard edge of the deck to prevent slipping off the deck.  
🗑
Transducer   a Device that transmits and receives a signal , Usually used for determining the water depth, locating structures and fish.  
🗑
Tunnel Hull   a type of boat hull that uses two typically planing hulls with a solid centre that traps air.  
🗑
Unrig   Remove the rigging from a boat  
🗑
V-Drive   a propulsion system for boats that consists of two drive shafts, a gearbox, and a propeller.  
🗑
V Hull   s the shape of a boat or ship in which the contours of the hull come in a straight line to the keel.  
🗑
Water Ballast   Weight low in the hull to improve stability or change the size of the wake from a ski boat, normally with water.  
🗑
Wheel   A DRIVER ROTATES IN ORDER TO STEER A VEHICLE, ALSO ANOTHER NAME FOR A PROPELLER  
🗑
Winch   a hauling or lifting device consisting of a rope, cable, or chain winding around a horizontal rotating drum, turned by a crank or by motor or other power source; a windlass.  
🗑


   

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