Automatic radio controls that will fly an airplane on an absolutely straight course regardless of cross winds, fog or other conditions are the latest contribution to air safety and precision. The new instrument is a combination of radio direction finder and automatic pilot. Former “homing” devices using one radio signal kept the plane’s nose pointed toward the station, but a cross wind would blow the plane off a straight course. The new automatic pilot uses two radio stations instead of one, mixing the two signals so that the plane is lined up with the stations from takeoff to landing. The rudder is held automatically at a position to point the plane up-wind at all times. The two stations may be ahead of the plane, behind it, or ahead and behind, just so they line up in the desired course of flight. For military purposes, two portable transmitters could be lined up at the home port in a direct line with the objective to be reached. With both receivers in the plane tuned to the “from” position, the airplane would fly in a straight line to the objective; then reversing the controls, the pilot could return directly on the same line.