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pypilot is a free software autopilot. To form a working autopilot you need both software and hardware components.
It is recommended to choose either tinypilot or openplotter system for the autopilot computer. There are 4 supported control interfaces:
A motor controller is required to drive the rudder drive motor
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.