The North U Boatspeed Seminar covers boatspeed all the way around the course. Upwind topics include mainsail and jib trim, helming, and a special Trim Solutions section to solve the most baffling problems in upwind performance. The Trim curriculum shows how angle of attack, depth, and twist combine to control upwind performance, and how to change trim to improve performance. The interactive Sail Shaper allows you to see how changes in sail controls change sail shapes, while video clips show real life trim and performance technique.