Flag of the Week – Week 4
If a boat is On the Course Side of the starting line before the gun, the Race Officer will raise Flag X accompanied by a sound signal. It is up to you to know if you are one of the offending boats. A boat that believes it was OCS must return fully to the pre-start side of line and re-start. If within hailing distance, the RO may yell at you, but don’t rely on it. The RO will fly flag X until all of the offenders have returned across the start line.
The meaning of it as a code flag is “Stop carrying out your intentions and watch for my signals.”