Understanding wind direction and the sailboat position in relation to the wind is one of the foundations of safe and efficient sailing. It determines which courses are possible, how the boat should be handled and when manoeuvres such as tacking or gybing are required. The two most important wind references are true wind and apparent wind. True wind is measured relative to the sea surface, while apparent wind is the wind felt on a moving yacht and results from the combination of true wind and the yacht’s own speed and direction. When sailing upwind, apparent wind is usually stronger and comes from farther forward, while downwind it is generally weaker because the yacht is moving in roughly the same direction as the wind.
The side of the yacht facing the wind is called the windward side, while the opposite side is the leeward side. If the wind comes from the port side, the yacht is on port tack; if it comes from starboard, the yacht is on starboard tack. The mainsail is normally carried on the opposite side from the wind. These terms are also important for collision-avoidance rules, since a sailing vessel on port tack will normally keep clear of a vessel on starboard tack.
A sailingboat cannot sail directly into the wind. The area around the wind direction where the yacht cannot make effective progress is known as the no-go zone. For a typical cruising boat, this zone is roughly 80 to 100 degrees wide, or around 40 to 50 degrees on either side of the wind. To reach a destination located directly upwind, the yacht must therefore sail a zigzag course by alternating between port and starboard tack.
As the yacht turns away from the wind, it passes through the main points of sail. Close-hauled is the closest practical course to the wind, usually around 40 to 50 degrees, with the sails trimmed in relatively tightly. On a close reach, at roughly 50 to 80 degrees, the sails can be eased slightly and the yacht often becomes faster and more comfortable. On a beam reach, at around 90 degrees, the wind comes from the side and the sails are eased farther out. A broad reach, roughly 110 to 150 degrees, brings the wind from the aft quarter, while running means sailing with the wind mainly from astern, approaching 180 degrees on a dead run. These angles are only approximate and vary according to yacht design, sails, sea conditions and whether true or apparent wind is used as the reference.
When a yacht turns towards the wind, it is heading up or luffing up; when it turns away from the wind, it is bearing away. As a general rule, the sails are trimmed in when heading up and eased when bearing away. When sailing upwind, a change from one tack to the other is made by tacking, with the bow passing through the wind. When sailing downwind, the same change of tack is made by gybing, with the stern passing through the wind. Because the boom can move across the yacht very quickly during a gybe, the manoeuvre must always be carefully controlled. For less experienced crews, sailing slightly away from a dead run is usually safer and more stable than keeping the wind exactly astern.
Understanding true and apparent wind, the no-go zone, the main points of sail and the difference between tacking and gybing provides the essential framework for handling a sailing yacht safely and confidently.
