Free tools
Sailing tools you can play with
Two small, free interactive diagrams that turn two of the trickiest beginner ideas — points of sail and apparent wind — into something you can drag and watch move. No sign-up, no time limit.
Points of Sail Trainer
Drag a boat around a wind rose and watch its zone — in irons, close-hauled, a reach, or a run — and its sail trim update live, on both tacks.
Open the trainer →Apparent Wind Calculator
Set true wind speed, boat speed, and wind angle and watch the vector triangle that produces the apparent wind speed and angle your sails actually feel.
Open the calculator →