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pypilot is a free software autopilot. To form a working autopilot you need both software and hardware components.
To get started, it is recommended to choose either tinypilot or openplotter system for the autopilot computer.
The autopilot has worked successfully sailing hundreds of miles on s/v alexandra as well as reported successful on more than a dozen other vessels including boats with hydraulic pumps, and steel boats above 29 tons.