Top-notch weather data is provided by professionals - official weather forecasting services: NOAA, Meteo-France, Deutscher Wetterdienst, ECMWF and others.
You can change units, wind speed display (animation or wind barbs), and weather data displayed on the map.
And it’s not just the weather - marinas have contact information so you can call or email the harbor master to book a berth or to ask about amenities.
Built for mariners by mariners, it displays necessary weather and marine info in a neat and simple way.
Special treat for sailors and boaters in the US is the option to display nautical charts.