Glossary
Welcome to the Yachts and Boating Glossary.  Nautical terms and phrases are listed below alphabetically.  If you spot any mistakes or have any new entries to wish to add please email us at info@yachtsandboating.com.  

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There are 119 entries in the glossary.
Pages: 1
Term Definition
AbackA sail is aback when the wind is on the forward side of the sail.
 
AbaftAft of abeam
 
AbeamRight angle to the fore and aft line of the boat.
 
AboardIn or on the boat.
 
AboutTo change tack, bringing the bow of the boat through the wind.
 
AdriftLoose, unattached or AWOL.
 
AfloatWaterborne.
 
AftTowards the stern (rear).
 
AheadFoward of the bows.
 
AhoyHailing call to another boat.
 
AmidshipsHalfway between bow and stern or centre position of the helm/rudder.
 
Astern

To the rear of the boat hull.

 
AthwartAcross the boat; athwartships.
 
AvastStop.
 
AwashLevel with the surface of the water.
 
BackAnti-clockwise change in the wind direction.
 
BackstayRear stay holding the mast.
 
BailerSmall receptacle for removing water from a boat.
 
BallastWeight placed low down within the hull of a boat to improve stability.
 
BalwarksWooden or steel rail running around the deck edge.
 
BarShallow patch of water across the mouth of a river or entrance to a harbour. 
 
BattensStrips of flexible plastic, wood or GRP inserted into pockets on a sail to maintain a good shape.
 
BeaconA fixed mark or structure to aid navigation/warn of hazards.
 
BeamThe width of a boat. 
 
BearingThe compass direction of an object from another.
 
BeatingSailing to windward by repeatedly tacking across the wind.
 
BecketAn eye or loop in rope.
 
Before

(the mast) Towards the bow.

 
BelayTo make fast or secure a rope; (colloquially to cancel or change an order).
 
BendA category of knot for joining ropes together.
 
BerthPlace for a boat to dock.
 
BightThe middle or loop of a rope.
 
BilgeInternal underwater area of a boat hull where water collects.
 
BinnacleThe housing for a steering compass.
 
BittsA pair of verticle posts for securing mooring lines or anchor warps.
 
BlockA plastic, metal or wooden shell holding one or more sheaves through which ropes are led.
 
BluffSteep-to, perpendicular.
 
BollardA verticle post for securing mooring lines.
 
BoomA spar used to hold the foot of a sail out.
 
BottlescrewA device for adding tension to a fixed rope or cable.
 
BowThe forward end of a boat.
 
BowlineKnot used to create a loop in a length of rope (can be on the blight, running or fixed).
 
BowspritSpar projecting forward of the stem.
 
BroachTo swing over broadside to the sea.
 
BulkheadVertical partition witin a boat.
 
BunkBed.
 
BuoyA float to aid navigation or moor to.
 
BurgeeA triangular flag flown to show membership of a club.
 
CableAnchor chain; or a measure of distance equal to one tenth of a nautical mile.
 
CareenTo heel a boat over to work on the bottom.
 
CarvelPlanking technique resulting in a smooth hull.
 
CatamaranTwin hulled boat.
 
CatenaryThe curve of an anchor chain.
 
CaulkTo make the space between planks watertight.
 
CavitationVibration caused by aeration of the propeller working surfaces.
 
CentreboardAn adjustable plate through the bottom of a boat to reduce leeward movement.
 
ChainplatesStrong parts of the hull either side of the mast to attach the shrouds.
 
CheckTo ease a line or rope.
 
ChineThe angle between the bottom and topsides of a hull.
 
CleatA fitting to which ropes can be fastened.
 
ClewCorner of a sail where the foot meets the leech (bottom. aft).
 
ClinkerPlanking technique whereby planks are overlapped to form a watertight seal.
 
Clutter

Unwanted returns from waves shown on the radar screen.

 
CoachroofCabin top raised to increase the room with the cabin.
 
CompanionSteps or ladder used to move from the deck to below decks.
 
CompassInstrument for indicating direction.
 
ContourA line on a chart joining points of equal elevation or depth. 
 
CounterThe overhanging portion of the stern.
 
CourseThe direction in which a boat is being steered.
 
CringleA rope loop or metal eye attached to the sail.
 
CrownWhere the arms of an anchor meets the shank.
 
DavitsSmall hoists for lifting tenders out of the water.
 
DeskThe floor of a boat.
 
DeviationCompass error due to the magnetism of the boats hull and fittings.
 
DipTo briefly lower and re-raise the ensign as a salute. 
 
DisplacementThe volume of water displaced by the hull.
 
DownhaulRope that pulls down on the tack of a sail to flatten it.
 
DraughtThe depth of a boat from the waterline to the lowest point on the keel.
 
DrogueA form of sea anchor used to limit drift or stabilise a boat or liferaft.
 
EbbThe tidal stream of a failing tide.
 
EnsignA national maritime flag
 
FairleadAn opening or fitting which improves the angle for working or prevents mooring ropes from damage.
 
FathomMeasure of depth equal to six feet.
 
FenderProvides protection to the hull of a boat from rubbing against a jetty/another boat.
 
FixA position of a boat established by visual or electronic means.
 
FlarePyrotechnic safety device used to signal distress.
 
FlashingNavigational light which has a shorter period of light than darkness.
 
FloodThe tidal stream on a rising tide.
 
FootThe bottom edge of a sail.
 
ForestayStay from the mast to the stem.
 
FrapTo bind together with rope.
 
FreeboardThe height from the waterline to the deck.
 
FurlTo roll a sail.
 
GaffSpar at the head of the a mainsail.
 
GaleWind of beaufort force 8.
 
GalleyBoats kitchen.
 
GimbalsTwo pivoted rings that hold items level dispite the angle of heel.
 
GooseneckFitting which holds the boom onto the mast.
 
GunwaleThe upper edge of the boat sides.
 
GybePutting the stern through the wind.
 
HalyardRope used to hoisting a sail.
 
HandsomelyGently or slowly.
 
HankFitting for attaching the luff of a sail to a stay.
 
InboardWithin or towards the middle of a boat.
 
JibSail set forward of the mast.
 
KedgeA light-weight anchor normally kept as a backup.
 
LashingSecuring with a rope.
 
MainsailSail set aft of the mast.
 
NeapsMinimum tidal range.
 
OccultingA navigational light which is lit for longer than it is in darkness.
 
PainterThe mooring rope secured to the bow of a dinghy or tender.
 
RaceA localised area of tidally disturbed water.
 
ScuppersHoles in the bulwarks to allow water to drain from the deck.
 
TabernacleDeck fitting to which the mast is attached to allow it to pivot and be lowered.
 
UnderwayWhen a boat is not anchored or attached to the shore.
 
VeerA change in wind direction clockwise.
 
WakeDisturbed water behind a boat caused by the hull moving through the water.
 
YachtA pleasure vessel which can be powered by sail or engine
 
YardA spar attached to the mast for spreading out a sail.
 


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