This shows the Cape Horn wind vane self steerer. This device will keep the boat at a constant angle to the wind by sensing wind angle with the white vane at the top. The oar that is in the water gets power from the motion of the boat through the water and turns the steering system through connections inside the boat. This is a helmsman that uses no electricity and does not dip into the food or beer. A wind vane steered John's previous boat to Hawaii for 17 days without a problem.