OpenCPN is a chart plotter and navigational app whether you're underway or making plans for a trip.

OpenCPN is a fantastic software that enables you to navigate your boat with ease, even while on the move. This software allows you to chart your course and keep track of your location right from your laptop. With OpenCPN, you can conveniently steer your boat from the helm station with peace of mind, knowing that you are in control of your vessel's safety. Whether you are a seasoned sailor or a novice boater, OpenCPN is an excellent tool for ensuring a smooth and enjoyable journey.


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 a separate plugin.

GPS Tracking:
Route navigation with ship tracking functions.
Waypoint navigation.
Autopilot output support.

Alarms:
Anchor watch/alarm functions.
MOB Alarm with tracking.

Weather:
GRIB and GRIB2 file input and display for weather forecasting.

OpenCPN also supports over 30 plug-ins.