Abstract: Apparatus for automatically steering a boat having a wheel-operated steering mechanism including a detachable motor-driven actuator arm engaging the spokes of the wheel. The actuator arm is connected through a clutch to a servo mechanism for driving the actuator. The servo mechanism is responsive to a heading set on a magnetometer or a preset apparent wind indication. The heading responsive circuitry includes an integrating loop to compensate for long-term changes in steering conditions.

Abstract: An anemometer includes a rotor mounted to spin about a vertical axis in response to wind being directed against it, and a cage having a plurality of circumferentially spaced apart, vertically disposed vanes surrounding the rotor. The vanes deflect the normal flow of air to produce an asymmetrical airflow pattern across the face of the rotor to cause the rotor to spin about its axis. A transducer senses the rotational speed of the rotor and converts it into a signal proportional to airspeed. In one form of the invention, the cage is fixed, and in another embodiment the cage is attached to a windvane to rotate with the windvane relative to the rotor. The windvane senses the direction of the wind, and a second transducer converts the rotational motion of the windvane into a signal proportional to wind direction.