The Second Mate — weather at sea and your boat on one screen

A web plotter for sailors and skippers, anywhere in the world: wind, waves, rain cells, cyclones and lightning, AIS and collision warning, anchor watch, and the official marine forecasts and warnings for open sea and coast. Free for now; no sign-up needed to start.

The app needs JavaScript. Not for navigation: it does not replace official nautical charts or the boat's instruments.

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