In athletics, some disciplines are difficult to follow for spectators. For football, it is clear to see when the ball is in the goal. In long jump, however, it is it is not easy to judge whether the last jump has set a new record. Virtual lines help the TV audience but they are not visible to spectators in the stadium. The PrimeLine system, developed by Golden Fly Sports GmbH, solves this problem by projecting the ‘mark to jump’ onto the sand.