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.