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The sail crossover chart editor uses draggable handles and a wide TWA/TWS plotting area. For best results, open this page on a laptop, desktop, or larger tablet.
What is a sail crossover chart?
A sail crossover chart is a visual guide that shows which sail or reefing setup is best for a given combination of true wind angle (TWA) and true wind speed (TWS). Racers and cruisers use crossover charts to make faster, more consistent sail-change decisions without relying only on feel or memory.
How to use this sail crossover chart generator
Use the colored range bubbles to map each sail in your inventory. The horizontal axis represents true wind angle, while the vertical axis represents true wind speed. Drag the handles to shape each sail’s usable range, rename the sail labels, change colors, toggle fills, and use dashed lines for reefing ranges or special notes.
- Add or rename each sail in your inventory.
- Drag the white handles to define that sail’s wind range.
- Use dashed, unfilled ranges for reefs, furling limits, or caution zones.
- Customize the chart title for your boat.
- Print or save the finished crossover chart as a PDF.
Why sailors use crossover charts
A clear crossover chart helps crews decide when to change from a J1 to J2, when to reef, when to move from a reaching sail to an asymmetric spinnaker, or when a sail is outside its efficient range. This is especially useful offshore, where watch teams need a shared reference for sail selection.
Tips for building a better sail selection chart
Start with conservative wind ranges, then update the chart after sailing with real data. If two sails overlap, show that overlap clearly so the crew can choose based on sea state, target angle, handling risk, or expected wind trend. Keep reefing ranges visible and easy to read so they are not overlooked when conditions build.
Advanced users can create ranges for things like water ballast or gear stacks. Keep an eye out for our rig tuning app coming soon!