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.

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