This is a sailing route planning tool. It must not be used for navigation.

It uses the isochrone method to find the fastest route your boat’s polar allows — not the safest. A responsible skipper weighs many other factors when planning a route.

It sees forecast wind, currents and OSM coastlines, and nothing else: the map is a coastline, not a chart — no depths, no marks, no small islands.

Forecast data are downloaded from official provider portals and converted for this app; I cannot guarantee that they are correct or up to date.

Use the forecast data and calculated routes as a reference only and at your own risk. For navigation you must use official forecasts and nautical charts.