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Weatherspark - WeatherSpark is a typical weather information service provider over the internet for freely getting the real-time hourly, daily, weekly and monthly graphical reports of the average weather.
zyGrib - GRIB File Viewer
UnderSee Explorer - Online Services
Open Nautical Charts - Open Nautical Charts offers free seacharts for everybody.
Argo - Boating Navigation - Charts, Routes, Tracks, Log