2 min read · Updated 25 June 2026
Marks are the buoys that define a racecourse, and rounding them well is decisive. They are where the whole fleet converges on one small patch of water, so places are won and lost in a few boat lengths. Two things make a good rounding: the technique — "wide then tight" — and the rules that govern who gets room. Get both right and you round in control; get them wrong and you lose ground and places.
The marks of a course
A typical racecourse is built around marks: the windward mark at the top (the upwind turning point), the leeward mark or a gate at the bottom, and sometimes offset and reaching marks. Boats sail the legs between them and turn around each one, so every lap brings several roundings. The windward and leeward marks are the key turning points of the classic windward-leeward course.
Wide then tight
The classic rounding technique is wide then tight. You enter the turn wide of the mark, then carve in to exit close to it — finishing the rounding hugging the mark and sailing your new course at full speed, in control. The alternative, tight then wide, swings the boat out on the exit, loses ground to leeward, and hands boats behind an opening to sail over you. "Wide then tight" is one of the first tactical habits a racing sailor learns.
Mark-room and the zone
Because boats converge at marks, the racing rules provide a special rule: mark-room. Within a zone around the mark — three boat lengths in most racing — a boat that is overlapped on the inside (or clear ahead) is entitled to room to make a seamanlike rounding. When the first boat reaches the zone, the overlaps are effectively locked in for this purpose, so arriving at the zone with an inside overlap is a major tactical goal. Mark-room is one of the most important — and most argued-about — rules in the sport.
Why marks decide races
A mark is where traffic, wind shadows and right of way collide. A boat that arrives with speed, clear air, an inside overlap and the right of way can gain many places in seconds; one that arrives slow, in bad air, or on the outside can lose them just as fast. This is why so much of racing tactics is about setting up the approach to a mark — positioning on the leg before so you arrive in the strong position. The right-of-way rules govern the close-quarters exchanges, and the sailing terms glossary covers the language.
Frequently asked questions
- What is a mark rounding in sailing?
- A mark rounding is turning the boat around one of the buoys, or marks, that define a racecourse — such as the windward mark at the top of the course or the leeward mark at the bottom. Marks are where boats converge and places are won and lost, so rounding them cleanly, fast and with the right of way is a key racing skill.
- What is the best technique for rounding a mark?
- The classic technique is 'wide then tight': enter the turn wide of the mark and exit close to it, so that you finish the rounding hugging the mark and sailing your new course at full speed. A boat that rounds tight-then-wide swings out on the exit, loses ground to leeward, and gives boats behind an opening. Wide-then-tight leaves you in control on the new leg.
- What is mark-room?
- Mark-room is the room the racing rules require boats to give an inside boat to round or pass a mark. Within a zone around the mark — three boat lengths in most racing — a boat that is overlapped on the inside, or is clear ahead, is entitled to room to make a seamanlike rounding. It is one of the most important and most argued-about rules in the sport.
- What is the zone at a mark?
- The zone is the area within three of its hull lengths of a mark, defined by the racing rules. When the first boat of a group reaches the zone, the overlaps are effectively locked in for the purpose of mark-room: a boat overlapped on the inside at that moment is entitled to room to round. Reaching the zone with an inside overlap is therefore a major tactical goal.
- Why are marks where races are decided?
- Because the whole fleet converges on the same small piece of water at once. That creates traffic, blanketing wind shadows, and right-of-way situations where boats must give room or keep clear. A boat that arrives at a mark with speed, clear air, an inside overlap and the right of way can gain many places; one that arrives badly can lose them just as fast.