OpenCPN is a chart plotter and navigational app whether you're underway or making plans for a trip.
Supported Chart Formats: Worldwide standard S57 and encrypted S63 vector chart support. BSB v3 and earlier raster charts. CM93 vector charts with per cell offset corrections. Up-to-date ENCs for selected worldwide regions, distributed by o-charts.org
AIS: AIS input with full target-tracking and collision alerting. AIS support for SART with selectable MMSI for automatic MOB handling. AIS support for DSC and GPSGate buddies.
Routes: Route planning with tidal support. Built-in great-circle routing. Integrated weather routing through qtVim or separate plugin.