Sailing terms every beginner should know

Sailing vocabulary is old, but it is not decoration. Every term exists because the ordinary word was ambiguous on a boat: “left” depends on which way you are facing, “rope” does not say which of the eleven ropes, and “that big pole” is the thing about to swing at your head. Learn the words in small groups that belong together — the boat, the directions, the sails and their controls, the maneuvers — and each group makes the next one easier. This guide is that sequence, with the exam-style distinctions flagged as they come up.

Parts of a sailboat

Bow, stern, hull and cockpit

• Bow — the front of the boat. Stern — the back. The transom is the flat surface across the stern.
• Hull — the body of the boat. The deck is the top surface you walk on; the cockpit is the lower working area where the crew sits and steers.

Keel, rudder and helm

• Keel — a fixed underwater structure that provides lateral resistance. On most modern keelboats it also carries ballast that contributes stability. On dinghies, a retractable centerboard (UK: centreboard) or daggerboard provides lateral resistance instead.
• Rudder — the underwater blade used to steer while water is flowing past it. A tiller is a lever connected to the rudder; a wheel operates it through a steering system. The helm is the steering position or apparatus, and informally can mean the person steering.
• Tiller — on a conventional tiller-steered boat moving ahead, push the tiller one way and the bow initially turns the other. Memory hook: tiller toward trouble, bow away.

Mast, boom and rigging

• Mast — the vertical spar holding up the sails. Boom — the horizontal spar along the foot of the mainsail. It swings across the boat during turns, which is why so many commands exist to warn you about it.
• Standing rigging — the fixed wires holding the mast up: the forestay (to the bow), the backstay (to the stern), and the shrouds (to the sides).
• Running rigging — movable lines used to raise, lower, shape or control sails and spars, including halyards and sheets. Dock lines and anchor rodes are lines, but not running rigging.
• Cleat — a fitting used to secure a line. A block is the nautical pulley assembly that redirects a line or provides mechanical advantage; a winch is the rotating drum used to haul and control a heavily loaded line.

Directions and sides: port, starboard, windward, leeward

Port and starboard

Port is the left side of the boat when you face the bow; starboard is the right. They never change with where you happen to be looking — that is the whole point. (Memory aid: port and left both have four letters.) Forward and aft are the directions toward bow and stern; the beam is the boat's widest point, so something abeam is off to the side, and the quarters are the rear corners.

Windward and leeward

The wind gets its own pair: windward is the side the wind is coming from, and leeward (pronounced “loo-ard”) is the side it is going to. Upwind and downwind describe travel toward or away from the wind. These four words run through everything that follows — sail trim, right of way, anchoring — so it pays to make them automatic before moving on.

Skipper, helm and crew

The skipper is the person with overall responsibility for the boat and crew. The person at the helm is steering, but is not necessarily the skipper. Crew means everyone working aboard; during a maneuver, clear instructions and a spoken reply such as “ready” matter more than traditional wording.

Sails, and the edges examiners like

Mainsail, jib and sail edges

• Mainsail — the principal sail attached to the mast, usually set aft of it and controlled by the boom. Headsail — any sail set forward of the mast; jibs and genoas are headsails. A genoa overlaps the mast, while a non-overlapping jib generally does not. A spinnaker is a large light sail for sailing downwind.
• Every triangular sail has three corners: the head (top), the tack (forward lower corner) and the clew (aft lower corner).
• And three edges: the luff (front edge), the leech (back edge) and the foot (bottom edge).
• Luffing is what a sail does when it flaps along its front edge — a sign it is let out too far for your course, or that you are pointing too close to the wind.
• Telltales — the short ribbons on the sail that show whether air is flowing smoothly across it.

The lines: sheets, halyards and friends

Halyards and sheets

Once a rope is aboard and has a job, it is a line — and its job gives it its name. Halyards raise and lower sails (main halyard, jib halyard). Sheets control a sail's angle to the wind. The mainsheet controls the mainsail; the two jib sheets control the jib, one for each side. Beyond those, the outhaul tensions the mainsail's foot along the boom, and the boom vang — commonly called a kicker in the UK — holds the boom down. To make fast is to secure a line, usually on a cleat; a painter is the short line on a dinghy's bow.

More precisely, rope is the material and most rope given a particular job aboard is called by that job: line, sheet, halyard, painter or rode. Sailors may tease anyone who says “rope,” but clarity and safety matter more than winning the vocabulary contest. Halyards hoist; sheets shape the sail's angle.

Trim and ease

Trim the sheet means pull it in, bringing the sail closer to the boat's centerline. Ease the sheet means pay line out, allowing the sail to move farther away. Neither command means raising or lowering the sail.

Sailing the boat: points of sail, tacks and turns

• Points of sail — the boat's angles to the wind: close-hauled (as close to the wind as the boat sails efficiently, sheets in hard), close reach, beam reach, broad reach and run (wind astern, sails right out). Any point with wind on the side is a reach.
• Tack (the state) — commonly named for the side the wind is on. Rule 12 deems the windward side opposite the mainsail. When its conditions apply, two sailing vessels in sight approaching with collision risk on different tacks require the port-tack vessel to keep clear; overtaking and other applicable rules must also be checked.
• Tacking (the maneuver) — turning the bow through the wind onto the other tack. Beating is working upwind through repeated tacks.
• Jibing (UK: gybing) — turning the stern through the wind. The boom can cross fast, so the maneuver is done deliberately, with a warning call.
• Heading up is turning toward the wind; bearing away is turning away from it. Head to wind means pointing straight into it; stuck there, unable to fall off onto either tack, you are in irons.
• Heel — the boat leaning under wind pressure (normal in moderation). A knockdown is an extreme heel, sails toward the water. Reefing is reducing sail area when the wind builds — see when should you reef.

Tack and jibe: the basic difference

During a tack, the bow passes through the wind. During a jibe, the stern passes through the wind. Both move the sails to the other side, but the boom can cross with much more force in a jibe.

Luff

The luff is the forward edge of a sail. A sail luffs when that edge flaps, usually because it is eased too far or the boat is pointing too close to the wind. To luff up also means to turn toward the wind. One word, three related uses.

Head up and bear away

Head up, come up or luff up means turn the bow toward the wind. Bear away, bear off or fall off means turn the bow away from the wind. These directions are relative to the wind, never simply left or right.

No-sail zone and in irons

The no-sail or no-go zone is the sector around directly upwind where the sails cannot produce useful forward drive. Head into it and the sails luff. If the boat loses speed and cannot steer back out normally, it is in irons — not under arrest, just embarrassingly parked in the wind.

Continue with ASA 101 practice questions, Sailing Foundations, Basic Keelboat Theory, points of sail and apparent wind, six essential sailing knots, and sailing right-of-way rules.

On the water: distance, depth and the harbour

Draft, distance and speed

• Nautical mile — the distance unit at sea: 1.852 km, about 1.15 land miles, and historically one minute of latitude. Knot — a speed of one nautical mile per hour (never “knots per hour”).
• Draft (UK: draught) — how far the boat extends below the waterline. Safe depth must exceed the draft by an appropriate under-keel margin. Freeboard is the height from the waterline to the deck edge: draft below, freeboard above.
• Tide is the vertical rise and fall of the sea; a current (or tidal stream) is horizontal water movement. The distinction matters enough that our tides guides are built around it.
• Buoy — an anchored floating mark; navigation buoys mark channels and dangers. A mooring is a fixed system used to secure a boat; a berth is its assigned place alongside or in a marina. Berth can also mean a bed aboard — context decides whether the boat or sailor is sleeping.
• Ahead and astern describe what is in front of and behind the boat. Under way means not at anchor, made fast to shore or aground; making way means actually moving through the water. A drifting boat can be under way without making way under power or sail.

Dockside words you will use immediately

• Fender — a portable cushion hung between boat and dock. Boats carry fenders; docks may have fixed bumpers, though everyday usage varies.
• Dock line — a line securing the boat. Bow and stern lines locate the ends; spring lines run diagonally and limit fore-and-aft movement.
• Make fast — secure a line. Take a turn means wrap it around a cleat, piling or winch to add friction while keeping control. Take up slack means remove looseness, not necessarily haul hard.
• Companionway — the entrance and steps between cockpit and cabin. Galley — the kitchen. Head — the marine toilet; confusingly, head is also the top corner of a sail.

Odd sailing terms that are worth remembering

• Lazy sheet — the unloaded jib or spinnaker sheet. It becomes the working sheet after the next tack or jibe, so “lazy” does not mean unimportant.
• Bitter end — the free or inboard end of a line or anchor rode: the end you do not want disappearing overboard.
• Telltales — short yarns or ribbons that report airflow across a sail. They tell tales about the wind, not the crew.
• Gooseneck — the hinged fitting joining the boom to the mast. One of the rare nautical names that looks roughly like the part.
• Boom — the horizontal spar along the mainsail's foot. The word did not come from the noise it makes when it hits something, but ducking during a jibe remains excellent advice.

Same boat, different words

If a lesson is coming up, use the first sailing lesson preparation guide.