Avalon WebRouter calculates the best route and provides you with a precise marine weather forecast synchronized with the route.

It applies to both sail and motor boats and  is part of the range of weather routing tools developed by Avalon Navigation Systems:

  • Avalon Offshore: Weather Routing, Navigation and Marine Cartography , simple, complete and powerful on an iOS or Android device. t
  • Avalon VPP: Free web tool to calculate personalized VPPs (Velocity Prediction Polars) for hull boats.
  • Avalon Virtual: Free weather routing software for virtual regattas on PC Windows or MacOs.
  • Avalon WebRouter: Web site to support skippers in preparing their daily coastal cruise.

This site has been voluntarily designed to be as simple as possible. Its prime objective is to introduce skippers to the advantages of weather routing..Routing options have been limited to keep the system as simple as possible.

Another objective is to contribute to safety at sea by providing a very detailed marine weather forecast synchronized with the planned cruise..

The weather sources have been selected to provide the most appropriate forecast by region or country:


Important notice: Avalon WebRouter calculates the optimized route from weather forecast and boat velocity prediction polars. It is the user’s responsibility to validate the calculated route on appropriate marine charts. Avalon Navigation Systems cannot be held responsible for any damage or liabilities that could result from the use of the system.

Please select your navigation area below to calculate your route. 

USA East Coast

USA West Coast


Great Britain

w/o Ireland