Each competitor is responsible for his own safety. There are no rules, but there are guidelines, which should be followed. The basic safety check is the stub check. The competitor hands in his stub at the start and his control card at the finish. Event officials match the two and any unmached stubs represent a missing competitor. With electronic punching event officials can request a 'did not finish' report. All competitors must report to the finish whether they have completed the course or not.