Question 1

The umpires penalize a boat for breaking a right-of-way rule and signal accordingly. Shortly thereafter the umpires decide they have made an error. May they cancel their signal, by displaying a green and white flag, or by displaying the other boat's signal, or by hailing or some other means of communication?

Answer 1

Question 2

Would the answer be the same if the umpires displayed a green and white flag when they intended to display a boat's signal?

Answer 2