If a mark is missing or out of position while boats are racing, the committee, if possible, puts it back or replaces it with a similar mark, or uses an object (often a committee boat) displaying M with repetitive sounds. If the committee cannot fix it and your race suffered, consider redress.
RRS 2025–2028 · Part 3
34 Mark Missing
A missing or misplaced mark is replaced or substituted by an object showing flag M.