OpenCPN

A cross-platform ship-borne GUI navigation application made up by a core program, a large set of plugins and freely available charts. The application is configurable with user icon. The core supports:

• GPS/GPSD Position Input and Display
• BSB Raster Chart display
• S57 Vector ENC and CM93 chart display
• AIS Input Decoding and Display
• Waypoint Autopilot Navigation

Plugin support includes wheather, tactical, annotations and tidal data. Pilot charts can be downloaded from project website at opencpn.org. Other useful add-ons may be found inside the "Download" link at at the same site.