Have a friend with a powerboat film your boathandling. Have your sail trimmers view trim from the powerboat. Combine your post-race debrief with a competitor. Have a crewmember time maneuvers with a stopwatch. Swap crewmembers around during a practice maneuver so they can better understand other positions.
![Sail chart](https://www.sailingworld.com/uploads/2024/07/speed-chart-300x225.jpg)