C4 Requirements Before the Start

C4.1

At a boat's preparatory signal, her hull shall be completely outside the line that is at a 90º angle to the starting line through the starting mark at her assigned end. In the pairing list, the boat listed on the left-hand side is assigned the port end and shall display a blue flag at her stern while racing . The other boat is assigned the starboard end and shall display a yellow flag at her stern while racing . B1

C4.2	Within the two-minute period following a boat's preparatory signal, her hull shall cross and clear the starting line, the first time from the course side to the pre-start side. B1