⛵ Sailboat Weather Router

Polar Diagram — Beneteau 50

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How to use

1. Set a route — click the chart to drop a green departure pin, click again for the red destination; a third click starts a new route. Drag either pin to fine-tune the start/end. Or type coordinates in section 3. Use the SF → Vancouver preset to get started.
2. Download GRIB — section 1 fetches free wind + wave forecasts from Open-Meteo for a grid around your route. No API key needed.
3. Polar — section 2 sets the boat performance model. Adjust the speed factor for cruising vs. racing.
4. Compute Route — section 3 runs isochrone weather routing in a background worker. Watch isochrones bloom across the chart. With Avoid land on, the route is kept off the coast.
5. Results — section 4 shows passage stats, the hour-by-hour table, and GPX export.

Drag the timeline slider (bottom) to animate wind barbs through the forecast. Shift-click (or right-click) the chart for a point forecast.

Land avoidance: for the US/Canada west coast (San Diego → Salish Sea / Howe Sound) a ~1 nm coastline is built into the app — used instantly, no downloads, unaffected by rate limits. Outside that region the mask is fetched from Open-Meteo's elevation data (coarser, ~15 nm). The Offshore safety buffer slider (0–300 nm) keeps the route that far off any coast — raise it to stand well clear, drop it to 0 to hug the coast. A destination sitting right in a harbour reads as land, so the router stops at the offshore approach and draws the final inshore leg as a dashed line for you to pilot. For a complete route, place the destination in open water.