A method, a system and a device used within such enhances the repeatability and overall performance of a person skiing through a water ski slalom course. The device is a series of markers positioned on the side of a ski boat which markings can be readily viewed by a skier being towed by the boat at a distance of up to about 100 feet. The method comprises having the skier noting the boat markings which the ski rope crosses as the skier begins a turn into the slalom course. Once a run of desired performance is obtained the skier can repeat that performance more readily by always beginning the initial turn into the slalom course based on the ski rope crossing the same marking on the boat.