Official site of OpenCPN Chart Plotter Navigation software. Thousands of boaters already use OpenCPN as their main navigational tool. You can too. Its open source.

OpenCPN (Chart-Plotter Navigation) is free chartplotter and GPS navigation software for use on boats. Here are some key features you'll love using.

OpenCPN does not come with charts. Don't worry, we've provided a list of chart sources. How to use the built-in chart installer. Instructions - Text or Video How to Download and Install Charts

Home Downloads Plugins Plugins for OpenCPN Plugins for OpenCPN 5.6.2 and up Third party features that expand the functionality of OpenCPN into niche areas. Use the built-in Plugin …

Independent Providers Who Carry Charts Known to Work on OpenCPN The Chart Downloader feature included with OpenCPN 4.2 and above, will help you download, update and organize …

Downloading the OpenCPN installation files. OpenCPN is supported on many operating systems including Microsoft Windows, Apple Mac OS X, Android and many distributions of Linux.

Thanks to volunteer interpreters, like you, OpenCPN Supports 20+ languages. If your native language isn't supported yet, a tiny bit of your time can make it happen.

OpenCPN is chart plotter and navigational planning software developed by a team of active sailors using real world conditions for program testing and refinement.

GeolocationTCP: The sole purpose of this program is to fill a gap for Windows 8 users unable to use OpenCPN with the internal GNSS sensor. The program creates a server which serves …

Basic User Manual Welcome new users! OpenCPN Quick Start Guide Use your favorite Windows, Mac or Linux desktop or laptop computer.