Definition
A preventer runs from the boom, ideally from its outer end, forward to a strong point at the bow or a foredeck cleat and back to the cockpit so it can be released under control. It is rigged whenever the boat is running or broad reaching, especially at night or in a seaway. A vang-to-toerail arrangement is weaker and risks bending the boom, so a full-length lead is preferred.
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