Sail trim

Memorizing the sail trim diagram is important, but there is a way to see if the sail is trimmed properly. Let the sail out until it starts to luff, and then pull it in just until the luffing stops. This works when sailing on a beam reach and higher. It works for both the mainsail and jib. I know there is a lot more in the sail trim course, but the above point about luffing fits well here.