OpenCPN

Open-source chartplotter and marine navigation app with GPS, AIS, raster and vector chart support.

Desktopfree

OpenCPN is a free, open-source chartplotter and navigation program for boats. It reads GPS position, displays BSB raster and S57 vector charts, decodes AIS traffic and handles waypoint routing with autopilot output. It runs on Windows, macOS, Linux and Android, and is aimed at sailors and motor-boaters who want a live navigation display at the helm.

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Problem & pain-point mapping
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What it's a strong alternative to
Trust & credibility signals

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