@RichardDoane From the rulebook: "If the boat pylon deviates more than 20cm from the centre of the course at the approximate position where the skier is passing each buoy, an optional re-ride shall be awarded if the path of deviation was a disadvantage to the skier unless the skier makes a complete pass. A mandatory re-ride shall be required if the path of deviation was an advantage to the skier. It shall be considered an advantage if the boat pylon deviates outside the 20cm toward the buoy that the skier is attempting to get around. It shall be considered a disadvantage if the boat pylon deviates outside the 20cm away from the buoy that the skier is attempting to get around."