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FMTC Nautical Terms

Term	Definition
Abaft	Behind. At or near the stern. Aft of amidships. On the after side of.
Abaft the beam	Bearing more than 90 degrees from dead ahead.
Abandon ship	Leave the boat with no intention to make further efforts to save or preserve her.
Abate	when the force of the wind lessens.
Abeam	Directly off the side of the boat. At right angles to the fore and aft line
Aboard	On or in any vessel or boat. On board
Abreast	Side by side
Adrift	Floating free without propulsion. Floating on the tide unsecured.
Aft	Towards, at, or near the stern.
Aground	The state of a vessel part which is touching the bottom. Held fast on the bottom.
Ahead	Forward of, Advance. In the direction of the bows.
Ahoy	The general nautical hailing term to attract attention.
Alpha	the letter "A" in the phonetic alphabet
Amidships	A helm order to put the wheel or tiller so that the rudder is fore and aft. To steer dead ahead
Anchor	Device that digs into the sea bottom to prevent the boat from drifting
Anchorage	The place where a boat, or boats, may anchor
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.
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
Anti-fouling	Paint on the bottom of a boat that reduces marine growth.
Astern	Behind. Backwards. In the direction of the stern. Outside and abaft of the vessel
At anchor	A vessel riding by its anchor.
ATON's	Aids To Navigation
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.
Aweigh	Off the ground with weight taken by supporting ropes, cable, or chain
Aye-aye sir	The verbal acceptance of an order
Back	The keep of a boat.
Back splice	Used to prevent the ends of a rope from unlaying
Bail	Remove water from a boat by hand, or with a baler
Ballast	Weight low in the hull to improve stability
Bank	An area of the seabed that raised above the surrounding ground
Bar	The silting-up of deposit or shallowing formed near the entrance to harbor or inlet
Barometer	Instrument that measures atmospheric pressure which determines changes of weather
Batten Down	Close openings and secure gear
Battery	Source of direct current (DC) for electronics
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.
Beacon	An artificial warning mark to aid navigation
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.
Beam sea	A sea rolling in at right angles to the vessels course.
Beam Wind	A wind blowing in at right angles to the vessels course
Beamy	Anything of excessive, or unusual beam. An unusually wide boat.
Bearing	The direction of one object from another. It may be given as true, magnetic, or relative to the vessel's
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)
Belay	Make fast a rope around a belaying pin or cleat. An order to cease what one is doing, or to cancel an order
Bell buoy	A buoy containing a bell that is rung by the motion of the sea.
Below	Between decks. Going deblow is descending from the upper deck
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.
Bilge	Lowest area inside the boat. Absolute nonsense
Bimini Top	Canvas canopy
Binnacle	Top mount remote control
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
Blowers	Fans that remove dangerous vapors from the engine compartment
Boathook	Pole with a blunt hook used for extending ones reach
Boom	Horizontal post of the main sail
Bow	Front of the boat
Bow Eye	Towing loop secured at the bow
Bow Line	Rope that attaches the front of the boat to a dock
Bowline	A know used to tie a loop in the end of a line
Bowsprit	A spar projecting from the bow of a sailing vessel, to which the headsails are secured
Bravo	The letter "B" in the phonetic alphabet
Breakwater	Artificial harbor. A protective barrier erected across a deck to break the force of any seas that are shipped
Bridge	Cockpit (control station)
Broach	Broadside to the waves
Broad On/Off	45 degree angle to front/back
Bulkhead	Vertical partition maintaining rigidity in construction and dividing a vessel into watertight compartments.
Buoy	Floating navigation aids
Buoyancy	Ability to float, expressed in positive or negative. A boat has positive buoyancy, a rock has negative
Burgee	Flag identifying ownership or membership
Can	Green cylindrical buoy
Capsize	Upside down in the water
Cardinal Points	North, South, East, West
Cast Off	Unfasten for departure
Catamaran	Boat with two hulls
Caulking	Any substance used for sealing between the seams of planking to make them watertight
Cavitation	Turbulence caused by a propeller blade spinning too fast and creative low-pressure bubbles
CDMVT	Angle conversion process from Compass to True Direction (+East)
Celestial Navigation	True direction as opposed to Magnetic or Compass
Chafe	Rub or wear away by constant use or friction
Chafing gear	Protection applied to prevent chafing
Chandlery	Shop where nautical gear is sold
Channel	The deepest part of a passage through which the main current flows.
Charlie	the letter "C" in the phonetic alphabet
Chart	relevant data, represented on and as a map, and used for navigational purposes.
Chine	Juncture of the side and the bottom of boat
Chop	Waves that are short and steep
Cleat	Fitting with arms used to fasten lines
CO Monitor	Carbon Monoxide warning device. Used in enclosed areas on boats with gasoline engines
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
Codline	Small line used for many handy purposes, such as lacings, ornamental knots, quick tie down of small items...etc.
COG	Course Over Ground, the course in the water adjusted for current and wind
Combined Seas	Wave height that is the sum of the swells plus the wind wave
Common whipping	Used to bind the end of to prevent it from unlaying and fraying
Companionway	Entrance between the deck and the cabin
Compass	Direction finding instrument using the Earth's magnetic field
Compass bearing	the position of any object observed, as indicated by the compass
Compass rose	A graduated circle printed on a chart for use as a reference for showing true and magnetic north
Complain	A ship is said to do this when she is creaking
Constant bearing	A bearing that remains the same, even though the ship is moving; If of another ship, it indicates a collision course
Course	Direction laid from point to point. The boat maintains a heading to stay on course
Cowl	Air Scoop
Crest	Wave top
Cross bearings	A simultaneous observation of two separate objects, the bearings of which are then laid on a chart to fix the ships position
Cuddy	A small cabin in the front of a boat
Current	Horizontal movement of water; set is its direction and drift is its speed. The flow of electricity
Danforth	The brand name of a type of anchor
Davit	The metal supports from which boats are hoisted or lowered, usually erected in pairs and swung into
Davy Jones	The evil spirit of the sea
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
Dayboard	Navigation aid for day use
Dead calm	A flat sea with no sign of moving currents
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
Dead slow	The minimum speed possible to retain steerageway
Deck	The floor of a boat
Delta	The letter "D" in the phonetic alphabet
Deviation	Compass error caused by its proximity to magnetic disturbances
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
Direction	Relative position of two points using three-digit numbers
Displacement	Weight of the water displaced by a boat
Distress	A state of danger requiring assistance
Dividers	An instrument with two movable points, used in chart work
Dock	An artificial enclosure for the berthing and retention of ships of any purposes. It may be wet, dry, floating or stationary.
Documented Vessel	Boat registered with the USCG instead of a state
Dodger	Canvas enclosure on a sailboat
Dog	A clip used for closing watertight door or hatches
Draft	Depth of boat below waterline
Dredge	Removal of accumulated runoff in waterways
Drift	To float unsecured with the tide. The speed of the current
Dumping	Legal or illegal release of garbage into the water
Ease off	Slacken a rope gradually. Loosing any tight fitting
Easting	The distance gained to Eastward
Echo	The letter "E" in the phonetic alphabet
Eddy	Circular water movement caused by current passing an obstruction or a counter current
Ensign	The distinguishing flag used to indicate nationality, usually flown at or near the stern
Entrance	The shape of the forepart of a vessel
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
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.
Equator	An imaginary circle around the middle of the earth. Zero degrees latitude
Even keel	Upright. Without a list. Drawing a similar depth of water fore and aft.
Fall astern	Drop back. Reduce speed and get astern of another vessel
Fathom	A measurement equivalent to six feet applied to rope for their length, and to depths.
Fenders	Cushions that protect the sides of the boat
Fetch	Area in which ocean waves are generated by the wind.
Fix	to ascertain the position of the boat by the intersection of any two or more bearings taken at the same time
Flame Arrester	Backfire Flame control devices requires on gasoline engines
Flare	A pyrotechnic distress signal. The curve of the freeboard from the bows, upward and outward, providing additional rising surface to oncoming waves.
Fleur De Lys	The decorative North point as printed on compass cards and compass roses
Flood Tide	Tidal current toward the land (rising level)
Flotsam	Goods lost by shipwreck, or anything that has gone overboard and is later found floating at sea
Fluke	Anchor component that digs in
Flying bridge	A small helm station located on the uppermost deck
Flying Dutchman	The phantom sailing ship that traditionally haunts the seas off the Cape of Good Hope
Fog	The limited visibility state generated when the temperature and dewpoint are within 4 degrees F of each
Fog horn	The apparatus used for signaling during periods of reduced visibility.
Following Sea	Waves coming from behind the boat
Fore	In, towards, or of the foremost part of any vessel.
Foul	Describes anything that will not run clear, becomes entangled, forms an obstruction, collides, or prevents free passage.
Fouled anchor	The term used when the anchor rode is entangled around the flukes of an anchor
Founder	Fill with water Go to the bottom Sink
Fox-trot	the letter "F" in the phonetic alphabet
Freeboard	Height of boat above the waterline
Freshen	when the wind increases in strength
From stem to stern	From one extreme end to the other. The maritime equivalent of bumper to bumper.
Fronts	Weather boundaries
Gale	A strong wind between a stiff breeze and a hurricane
Galley	Kitchen
Gangway	Walkway between a boat and the dock
Gear	Personal baggage
Generator	Motor that produces alternating current
Ghosting	Under sail and making way, when there seems no wind
Gimbals	Rings that enable a compass or stove to remain level
Give way vessel	A vessel, whose duty it is to keep clear of another by taking necessary action
Golf	The letter "G" in the phonetic alphabet
GPS	Global Positioning System; U.S. military satellites that broadcast signals for receivers to determine exact position of earth
Ground Tackle	Anchoring equipment
Gunwale	Juncture of the top and the side of boat
Hail	Call to another vessel
Half-tide	The mean level of the sea during springs or neaps; it is therefore a constant factor
Halon	Fire extinguishing material using in engine compartments
Halyard	Roped used for hoisting and lowering flags, sails, etc
Harbor	An area of water partially enclosed
Hard chine	A feature of a boat in which the topsides and bottom meet at an angle rather than curving to a round
Hatch	Opening in deck to the area below
Haul	Pull on a rope.
Hawespipe	A pipe fitted to the deck that allows rope, cable, or chain to pass through
Haven	An inlet from a coastline where ships may anchor and shelter
Head	Toilet/Bathroom
Head sea	Waves approaching from the front of the boat
Heading	Direction the boat is pointed
Headway	A vessel is said to make headway when she advances, bows first, and begins to make way
Heave	Vertical motion of the boat due to waves A command to lift or pull together
Heave To	Stop, trim sails, or work the engine so as to keep the vessel almost stationery.
Heel	Leaning to the side
Helm	The steering console or station
High tide	The greatest elevation of a tide at a certain place.
Hitch	Knot used to attach to an object
Hold	A special compartment or space used for stowing cargo
Holding Tank	Storage tank for sewage
Holidays	Bare patches missed when painting or patching
Hook	The anchor
Hotel	The letter "H" in the phonetic alphabet
Hove to	Underway, but not making way through the water
Hull	Lower part of the boat in contact with the water that provides buoyancy
Hull down	Said of a vessel beyond the horizon, with only its masts in view
Hypothermia	Inability to maintain sufficiently warm body temperature
India	The letter "I" in the phonetic alphabet
Inlet	Narrow waterway from the ocean to an inland bay
Isobar	A line drawn to link areas of equal barometric pressure
Jetsam	Goods thrown overboard to lighten a vessel
Jetty	Structure projecting out from the shore
Jib	The foremost sail in a sailing vessel, triangular in shape, and set between the foremost and the bowsprit
Jibe (Gibe)	Sailing maneuver with the stern into the wind
Jonah	Anyone reputed to bring misfortune or disaster.
Juliet	The letter "J" in the phonetic alphabet
Jury rig	A temporary setup used until permanent repairs can be made
Keel	The solid beam running the length of the lowest part of the hull.
Killick	A small anchor. A large stone or weight used for anchoring
Kilo	The letter "K" in the phonetic alphabet
Knot	Mechanism to secure a rope The equivalent of one nautical mile per hour
Labor	Pitch and roll in heavy seas, show signs of working
Lading	vessels cargo
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
Landfall	Approaching land, especially after a long voyage
Landlubber	A man of the land who is uninitiated as to the ways of nautical matters
Landmark	A conspicuous spot onshore used as a navigational aid
Lanyard	Length of rope fastened to an object
Lateral Buoyage	System of red and green buoys that mark the edges of navigable channels
Latitude	Degrees :Minutes:Seconds (0-90) North/South of the Equator
Lay to	Stop by keeping into the wind
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
Leeward	Downwind side, sheltered from the wind.
Let fly	Let the sheet go, suddenly spilling the wind from a sail
Lima	the letter "L" in the phonetic alphabet
Line	Rope
List	Continuous lean to one side
LOA	Length Over All, the primary dimension of a boat
Log	Device for measuring distance through the water
Longitude	Degrees:Minutes:Seconds (0-180) East/West of the Greenwich Meridian
Lookout	A person specially posted to keep a diligent watch, to observe and report all that come into view
Mackerel sky	A sky with long white streaks of cloud, often a portent of impending rain
Magnetic bearing	The bearing of an object in relation to the magnetic compass
Magnetic compass	A ships standard compass
Magnetic course	A course as read from the magnetic compass rose on the chart
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
Maiden voyage	The first trip of a new vessel
Make fast	To secure
Make headway	to advance through the water
Make way	boat moving under its own power
Man overboard	The alarm called by anyone who sees someone fall over the side into the water.
Mare's tails	White feather-shaped wisps of clouds; they often indicate an increase of wind if they gather into a regular formation.
Marina	Docking area usually with services
Marlinspike seamanship	the term embracing knotting, splicing, seizing, etc...; the art of shaping and working ropes.
Mast	Vertical post on sail boats
Mayday	Emergency distress call
Meridian	A line that will cut through the equator at right angles and run from pole to pole
Metal Mike	auto pilot
Mike	the letter "M" in the phonetic alphabet
MLLW	Mean Lower Low Water, reference level used for depth measurements on nautical charts in the USA
Mooring	Buoy used by boats to tie up
Morse Code	Nearly obsolete means of nautical communication using "dots" and "dashes"
Nautical Mile	one minute of latitude roughly equal to 1.15 statute miles
Neap tides	those with smaller range than spring tides; not as high, low, or rapid
NOAA	National Oceanic and Atmospheric Administration, reports weather and tidal information
November	the letter "N" in the phonetic alphabet
Nun	A red, even-numbered, cylindrical shaped buoy marking the right side of a channel as you return to port. Cone top
Observed position	A vessels position plotted on a chart from the observation of objects, as opposed to dead reckoning
Occulting light	such a light that is on more than off
On the beam	At right angles to the fore and aft centerline of a ship. Directly off the side of the ship
On the bow	Within the angle from right ahead to 45 degrees on either side
On the quarter	On a bearing midway between the beam and the stern
Oscar	the letter "O" in the phonetic alphabet
Out of trim	with a list, down at one end, Untidy
Outboard	Outside the ship or boat,Farther towards a ships side. A portable, self-contained propelling unit, secured to the transom of small boats.
Overboard	Over the side and into the water
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.
Painter	The rope at the bow of a small boat for making it fast.
Papa	the letter "P" in the phonetic alphabet
Passage	A long voyage from one place to another
Pay Out	Slacken and ease a rope so that it runs freely
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.
PFD	personal flotation device (life jacket)
Phonetic Alphabet	system used to identify letters in verbal communications
Pier	Structure extending into the water for tying a vessel to
Piling	Vertical post in the water
Pilot	A person licensed to navigate ships through channels and fairways
Pilot boat	Used by pilots for meeting ships
Pilot house	The wheel house
Piloting	Navigating a boat by determining position and directing movement
Pitch	The depression of the bows plunging into a trough in the sea The theoretical distance a propeller travels in one revolution.
Pitch pole	Be ended up, stern first, and be completely overthrown by the sea
Planing	when a boat is moving through the water with bows lifted well clear and more out of the water than in
Planing Hull	Power boat that eliminates the bow wake
Plastic boat	Derogatory term for a fiberglass boat
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
Pontoon	Any large tank used as a platform
Poop	The raised deck on the after part of a ship
Pooped	When a sea breaks over the stern when running before a wind or sea
Port	Left side of a vessel. A seaport, that part of any place that is made available for shipping
Port Tack	Sailing "give way" with wind from the left side
Porthole	An opening in the ships side to let in light and air
Poseidon	The god of the sea in Greek mythology
Positive buoyancy	the quality possessed by any craft that would remain afloat when waterlogged
Pram	A small dinghy with a cut off bow, or foward transom, used as a tender to larger boats
Prevailing Wind	Typical direction of the wind at a locale
Prime meridian	the meridian which passes through greenwich, and from which longitude east or west is reckoned
Prohibited area	An area marked on a chart, where anchoring, trawling, or fishing may be forbidden by authority
Prolonged blast	A blast of the horn of 4-6 seconds duration
Prop walk	Sideways force created by a spinning propeller
Propulsion - Diesel	Engine that runs by compressed combustion
Propulsion - Gasoline	Engine that runs by sparked combustion
Pulpit	An elevated tubular metal guardrail set up at the bow or stern; typically extending from the bow
Purse Seine	A seining net which can be closed like a purse
Quarter	The side of the ships between the beam and the stern
Quartering	Sailing with the wind coming over the quarter
Quartering wind	Wind that comes from the ships quarter
Quay	Docks used to load/unload cargo
Quebec	The letter "Q" in the phonetic alphabet
Race	A strong current that disturbs water over a large area
Radar	System that uses the transmission/ reflection/ reception of radio waves to determine distance, direction, and size of an object
Rake	The angle of backward inclination of a ships masts or funnels. The slope of a bow or stern beyond the keel ends
Range	Distance away of an object The difference between the depth of water at high and low tides
Reach	A long straight part of a waterway, or distance between two bends in a river.
Red-Right-Returning	RED buoys on the RIGHT when RETURNING from the sea
Reef	to reduce sail area by folding, rolling, or tying up part of the sails. A chain of rocks lying submerged near the surface
Refitting	A period during which repairs, reconstruction, and replacements are effected
Regatta	A program of sailing and rowing races arranged by an authority or club
Reserve buoyancy	Those compartment above water level that may effectively be made watertight
Rigging	Sailing ropes and hardware
rip tide	A running tide, rising as it flows, and breaking in ripples
Rode	Anchor rope and/or chain
Roll	Vertical motion from side to side
Romeo	the letter "R" in the phonetic alphabet
Rudder	Movable fixture in the water that provides steering
Rules of the Road	Navigation guidelines
Running Lights	Red, Green, and White lights used by boats at night
Scope	Anchoring length to depth ratio
Screw	Propeller. A type of fastener, usually metal similar to a bolt.
Scuppers	Holes cut in bulwarks for water to escape overboard from decks
Scuttle	To sink a ship by cutting holes in her
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
Sea legs	Possessed by those who have the ability to walk about on a vessel pitching and tossing about in heavy seas
Sea room	The area around a ship clear of obstructions and of land
Sea State	open water conditions resulting from wind and water activity
Seacock	Hole in hull with a valve to regulate the water flow
Set	The direction of the current.
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
Ship	Boat longer than 20 meters. To receive anything onboard
Ship oars	Place oars in crutches or oarlocks ready to use
Shoal	A place where water is not deep and endangers navigation
Shore Power	Electrical power (AC) via cables provided at the marina as opposed to the engines or a generator
Shrouds	Wires that run to the side of the boat to support the sail mast
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
Sierra	the letter "S" in the phonetic alphabet
Slack Water	Tidal period between flood and ebb tides
Sling	Hoist that lifts a boat out of the water
Slip	Berth with docks on 3 sides
Small Craft Advisory	Winds to 33 knots and/or dangerous sea conditions for smaller boats
Snub	Suddenly check anything that is running out
SOG	Speed over ground, the speed in the water adjusted for current wind
Sounding	A depth reading
Spars	Poles used in sail rigging
Spindrift	Spray whipped off and blown from the crests of waves
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
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
Starboard	the right hand side of the boat when facing forward
Starboard Tack	Sailing "right of way" with wind from the right side
Stateroom	A large cabin formerly described as being set aside for the owner, but now referenced to an increased level of luxury and comfort
Stays	Wires that run to the front and rear of the boat to support the sail mast
Steerageway	Sufficient motion to support steering
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
Stern	Back of boat
Stern Line	Rope that attaches the back of the boat to a dock
Stores	Food and supplies
Storm Surge	Rising sea preceding a storm
Stove in	Damaged by anything breaking through into a ship
Stow	TO put in its proper place
Superstructure	Structures above the deck
Swamp	Waves coming into the boat
Sway	Horizontal motion of the boat due to waves
Swells	Long waves from a distance that do not crest
Swing	as she is tied to a mooring or at anchor and moves to changing winds or tides
Swing a compass	Ascertaining deviations for calibrations of a magnetic compass
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
Tackle	Assemblage of ropes and blocks
Taff rail	The rail at the stern of a ship
Tango	the letter "T" in the phonetic alphabet
Tender	Accommodate larger outboards.
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
Trade winds	Persistent tropical winds that blow from the subtropical high pressure towards the equatorial low pressure
Transom	Vertical partition at the back of the boat
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
Trim Tabs	Adjustable planes at the stern that allow the pilot to adjust the trim of the boat
Trip Line	Rope to the anchor crown used to mark its place and assist in pulling when stuck
Trough	Low point between waves
Turn turtle	To turn over completely
TVMDC	Angle conversion process from True to compass direction (+ West)
Twin screw	A vessel with two propellers on separate shafts
Underway	Not tied to the dock
Uniform	the letter "U" in the phonetic alphabet
USCG	United States Coast Guard
Variation	The angle between True North and magnetic North; it varies in different parts of the world and may be either easterly or westerly
Veer	Change direction as does the wind
Ventilation	Turbulence caused by a propeller blade spinning too close to the surface and creating air bubbles
VHF	Very High Frequency
Victor	the letter "V" in the phonetic alphabet
Voyage	Complete trip with multiple passages
Wake	Waves formed by the passing of a vessel through the water
Wash	The turbulent water left behind by any vessel passing through the water
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
Waypoint	Position saved in a GPS receiver
Weigh	to raise an anchor or depart
Wharf	Structure parallel to the shore
Whiskey	the letter "W" in the phonetic alphabet
Wind waves	Waves created locally by the wind
Windlass	Anchor winch
Windward	Upwind side
X-ray	the letter "X" in the phonetic alphabet
Yacht	Boat used for recreation with luxury features
Yankee	the letter "Y" in the phonetic alphabet
Yaw	Horizontal motion from side-to-side
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.
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
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.
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.
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.
Pump Out	To empty your boats onboard sewage and waste tanks. Pump out stations are available at most marinas.
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.

Created by: laineoconnor19

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