Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A preventer, or jibe-guard, is a mechanical device on a sailing vessel which limits the boom's ability to swing dangerously across the boat during an accidental jibe. The uncontrolled jibe (or gybe) is feared by all sensible yachtsmen. The heavy boom can potentially inflict severe head injuries or dispatch crew members over board; even the mainsheet or traveller can also inflict serious injury. Uncontrolled jibes may also damage the boat itself. Rigging a preventer on a yacht's mainsail is often performed when the wind is behind the beam (i.e. when it's coming from more than 90° off the bow). It can also be useful at other times when there is more swell than wind, a situation when the wind may not have the strength to keep the boom in place as the boat dips and rolls.

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