Before revision: Because the lateral wind forces are highest on a sailing vessel, close-hauled and beating to windward , the resisting water forces around the vessel's keel, centerboard, rudder and other foils is also highest to mitigate leeway—the vessel sliding to leeward of its course .
After revision: Because the lateral wind forces are highest when sailing close-hauled and beating to windward , the resisting water forces around the vessel's keel, centerboard, rudder and other foils must also be highest in order to limit sideways motion or leeway .