Sailing Glossary
Learn the language of the sea. Tap the speaker to hear any term.
Bow
The front of the boat.
Stern
The back of the boat.
Port
The left-hand side when facing forward.
Starboard
The right-hand side when facing forward.
Hull
The main body of the boat that sits in the water.
Keel
The heavy fin under the hull that provides stability and resists sideways slip.
Rudder
The underwater blade at the stern used to steer.
Tiller / Wheel
The control connected to the rudder for steering.
Mast
The vertical spar that supports the sails.
Boom
The horizontal spar along the foot of the mainsail.
Mainsail
The principal sail set behind the mast.
Headsail / Jib / Genoa
The sail set forward of the mast.
Halyard
A line used to hoist a sail.
Sheet
A line used to control the angle of a sail.
Winch
A drum that gives mechanical advantage to tension lines.
Cleat
A fitting used to secure a line.
Tack (verb)
To turn the bow through the wind.
Gybe (verb)
To turn the stern through the wind.
Close-hauled
Sailing as close to the wind as efficiently possible.
Reach
Sailing with the wind on the side of the boat.
Run
Sailing with the wind behind the boat.
Luffing
The flapping of a sail that is eased too far or pointing too high.
Telltales
Small ribbons on a sail that indicate airflow and trim.
Reef
To reduce the area of a sail in strong wind.
Heave-to
To stop the boat at sea by backing the headsail against the main.
Heel
The sideways lean of the boat under sail.
No-go zone
The arc directly upwind where a yacht cannot sail.
COLREGs
The international rules for preventing collisions at sea.
Lateral mark
A red or green buoy marking the side of a channel.
Cardinal mark
A yellow-and-black buoy indicating safe water by compass direction.
Bearing
The direction to an object, measured in degrees.
Pilotage
Navigating by visual references near the coast.
Lifejacket
A wearable buoyancy aid that keeps a person afloat.
Harness & tether
Gear that clips you to the boat to prevent falling overboard.
Flare
A pyrotechnic distress signal.
MOB
Man overboard — a crew member has fallen into the water.
Beaufort scale
A scale describing wind strength from 0 (calm) to 12 (hurricane).
Knot (speed)
One nautical mile per hour.
Gust
A sudden, brief increase in wind strength.
Tide
The rise and fall of sea level caused by the moon and sun.