Rule 13, While Tacking
A boat is no longer subject to rule 13 when she is on a closehauled course, regardless of her movement through the water or the sheeting of her sails.
Question
Rule 13 applies until the tacking boat ‘is on a close-hauled course.’
However, the rule does not say whether the boat must be moving when she assumes
a close-hauled course. Is it intended that, at the moment rule 13 ceases to
apply, the boat must actually be moving through the water on a close-hauled
course and not merely be on such a course?
Answer
A boat is no longer subject to rule 13 when she is on a close-hauled course,
regardless of her movement through the water or the sheeting of her sails.
RYA 1967/8