When Irene’s bow came abeam of the mark, she was no longer sailing “to the mark.” Her proper course was then to tack around the mark, and she promptly did so. As Irene tacked, Oscar, who wanted to tack as soon as Irene was out of his way, began his tack. At position 3, just after Irene passed head to wind and before Oscar luffed all the way up to head to wind, contact occurred between the starboard af corner of Irene’s transom and Oscar’s port side. There was neither damage nor injury. Each boat protested the other.