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Abaft
Towards stern of vessel
Abeam
Alongside the vessel
Aft
At the stern of the vessel
Ahead
in front of the vessel
Ahoy!
Hey!
Amidships
Towards the centre of the vessel
Anchor
Device used to secure a vessel to the bottom of a body of water
Astern
Behind the vessel
Barometer
An instrument for measuring air pressure
Beam
Greatest width of a vessel
Bearing
Direction of an object
Becket
A device for holding ropes
Bight
A curve made in a rope by doubling back on itself
Bilge
Lowest spaces in a vessel's hull
Bitt
Strong point for securing lines
Bitter end
Inboard end of a line
Bollard
A heavy post on a dock to secure a vessel to
Bootstripe
Stripe painted on the waterline of a essel to deermine if the vessel has been correctly loaded
Bow
Forward end of a vessel
Bouy
An aid to navigation
Bowline
Moat common knot used on vessels also known as the "king of knots"
Broach
Uncontrolled turning of a boat parallel to the waves common cause of capsize
Bulkhead
A vertical partition separating one part of a boat from another
Bung
A stopper
Capsize
To turn a vessel bottom side up
Carbon monoxide
A highly poisonous gas
Catamaran
A twin helled vessel
Cavitation
Bubbles that appear around the blades of a propeller causing it to "slip"
Centreline
Imaginary line down the middle of a vessel
Centre of buoyancy
Centre of the mass of the water a boat displaces
Centre of gravity
The centre of a boat's total mass
Chafing
The wearing of ropes due to friction
Chart
A printed or electronic geographic representation of navigable waterways
Chine
The intersection between the sides and bottom of a boat
Chop
Short sharp waves produced by wind against swell
Coaming
Protective lip around the cockpit of a vessel
Cockpit
The space on a boat where the steering wheel is found
Datum
Technical term for the baseline from which chart's vertical measurement are made
Dead ahead
Directly in front of us
Dead slow
As slow as a vessel can go without stopping
Depth sounder
An electronic device to show water depth
Deviation
The effect of a vessel's magnetic fields upon a compass
Don
To put on
Doff
To take off
Dinghy
A small open boat
Displacement
Weight of water displaced by a vessel = vessel's weight
Draft
The vertical depth from the bottom of the keel to the waterline
Drag
The forces opposing the direction of movement
Ease
To slacken the tension on a line
Fathom
Nautical measure usually of depth (six feet = 1 fathom)
Fender
A cushion used to protect the sides of a boat
Fid
A tapered tool used to separate strand of a rope to splice
Fluke
Part of anchor that digs in to bottom
Forward
Towards bow of boat
Fouled
Any piece of equipment that is jammed or stuck
Freeboard
The vertical distance from the surface of the water to the gunwale
Front
The boundary between two masses of air of different temperature
Galley
The kitchen area of a boat
Galvanic action
The electrical current that flows between two dissimilar metals when immersed in salt water causing corrosion
GPS
(Global Positioning System) satellite based radio navigation system
Ground tackle
Collective term for anchor and its associated gear
Gunwale
The upper edge of a vessel's sides
Hatch
An opening in a boat covered by a watertight cover
Heading
The instantaneous direction of a boat's bow
Headway
The forward motion of a boat through the water
Helm
The wheel of tiller of a boat
Hull
Load carrying part of a vessel
Inboard
Inside the boat
Isolation switch
Switch used to disconnect batteries from an electrical system
Jolly Roger
Privateer pennant also known as the skull and cross bones
Keel
Main structural member of a vessel i.e. its backbone
Knot
Measure of speed equal to a nautical mile per hour
Latitude
Horizontal lines running parallel to the equator
Leeward
Direction away from the wind
Leeway
Sideways slipping of a boat caused by current and/or wind
Length over all (LOA)
Length of vessel along the deck from bow to stern
Line
What ropes are called on board a vessel
List
The permanent leaning of a vessel
Longitude
Meridians running north to south through the poles
Lubbers line
Line through the centre of a compass parallel to the centreline of the vessel
Magnetic north
Northerly direction of the earth's magnetic field
Meridian
Imaginary lines running north south through the poles
MHW
(Mean High Water) tidal datum average of all high water over 16 years
MLLW
(Mean Lowest Low Water) tidal datum average of lowest low over 19 years
Mooring
Chain of line attaching a floating object to a stationary object
Nautical mile
length of one minute of latitude approximately 1.852km
Navigation
The science of locating your position an how to get where you are going
Outboard
Toward or beyond the vessel's sides
Painter
A line attached to the bow of a vessel for mooring or making fast
Payout
To ease out a line
Pile
Long heavy timber driven into seabed to support a dock or suchlike
Piloting
Navigation involving frequent reference to charted objects
Pitch
The angle of the blades of a propeller
Pitching
Movement of boat vessel in the bow-stern plain
Port
Leftside of a boat facing forward or a harbour
Range
Distance a vessel can travel in nautical miles on the available fuel
Rode / Warp
The line attached to an anchor
Rolling
Vessels movement on the port-starboard plain
Rudder
A vertical plate or board that can be pivoted to steer the vessel
Running
Travelling with the sea
Running lights
The lights required to be shown between sunset and sunrise on a vessel
Sacrificial anodes
Plates used to prevent corrosion due to galvanic action
Scope
Length of rope or chain
Seaworthy
Refers to a boat's capability to put to sea
Ship station license
Required to operate a VHF radio on board a vessel
Splice
Method used to permanently attach two pieces of line together or form a permanent loop
Spring line
Mooring line run laterally to vessel that reduces the impuse force on lines and bitts
Standing part
The opposite end of the working part of a line i.e. fixed park
Starboard
Right side of the vessel facing forwards
Stem
The foremost upright timber of a vessel at the bow
Stern
Back of a vessel
Swamp
To fill with water
Swells
Relatively long wind generated waves
Tackle
Combination of blocks and line to gain mechanical advantage
Thimble
A grooved metal loop around which a rope or cable is spliced to reduce chafe
Tide
The vertical movement of water on the planet
Tiller bar or handle
For turning a boat's rudder or motor
Transom
Stern cross section of a vessel
Underway
A vessel making way
Variation
The angular difference between magnetic and the geographical meridian
Wake
The disturbed water astern of a moving vessel
Warp / Rode
The line attached to an anchor
Waterline
The line on the boat's hull that intersects the water
Windward
Towards the wind
Working end
Opposite end of the bitter end of a rope
Yaw
The shearing off of a vessel to either port or starboard