CALL MR 19              

Rule C6.5 Protests and Requests for Redress by Boats: Umpire Decisions
Rule C8.4 Penalties Initiated by Umpires—informing the protest committee
Rule C9.3 Other Proceedings

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
No. There is no provision in Appendix C to change or amend decisions or signals. When a penalty signal is displayed, the boat is bound by rule C5 to take the appropriate penalty.

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
Yes.