when the line sighter on the race committee boat identifies one or more individual competitors as being on the start line’s course side at the race’s official start (OCS). The race committee displays the International Code Flag “X” (square flag with a blue cross dividing a white field) and sounds a signal—to avoid confusion, it is probably a different sound than is used as the start signal. The X flag remains on display until all identified boats have properly restarted. If the applicable Sailing Instructions allow, the race committee may also notify those competitors who were over early by hailing them or alerting them over the radio. However, competitors are expected to know whether they started correctly. See also: Racing Rules of Sailing for 2013 – 2016 rules 29.1. For penalties that are applied for rule violations at the start, see rule 30, Black Flag Rule, I Flag Rule, and Z Flag Rule.