OpenCPN is a free-to-use chart-plotter and GPS navigation tool.
- Worldwide, standard, S57 and encrypted S63 vector chart support.
- IHO S52 compliant display of S57 and S63 vector charts.
- BSB v3, and earlier, raster chart support.
- "BSB4" and "nv-chart" support through plugins.
- CM93 vector chart support, with per cell offset corrections.