Current auto-pilot devices can only make ships sail forward according to the heading. In the smart control system of this technology, the core control program for the auto-pilot control system can derive the operation commands of the propulsion on the test ship from the track, speed, heading, and other commands. It achieves autonomous sailing with tracking or autonomous sailing at a fixed orientation/speed. It can also correctly dodge incoming ships or obstacles and return to the original course to truly achieve unmanned auto sailing.