Modern Autopilot Systems

Many modern autopilots can receive data from a Global Positioning System (GPS) receiver installed on the aircraft. A GPS receiver can determine a plane's position in space by calculating its distance from three or more satellites in the GPS network. Armed with such positioning information, an autopilot can do more than keep a plane straight and level -- it can execute a flight plan.

plane landing
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The newest autopilots can execute an entire flight plan.

Most commercial jets have had such capabilities for a while, but even ­smaller planes are incorporating sophisticated autopilot systems. New Cessna 182s and 206s are leaving the factory with the Garmin G1000 integrated cockpit, which includes a digital electronic autopilot combined with a flight director. The Garmin G1000 delivers essentially all the capabilities and modes of a jet avionics system, bringing true automatic flight control to a new generation of general aviation planes.

Wiley Post could have only dreamed of such technology back in 1933.

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Cruise Control -- Autopilot for Your Car
Autopilots aren't found only on airplanes. Ships have them, too, although they are often known by different names. Some captains refer to their ship's autopilot as "Metal Mike," a playful name that arose soon after Elmer Sperry invented the gyrocompass.

Others refer to the device as an "autohelmsman" because it assumes the role of helmsman, steering the ship efficiently with no human intervention. Even your car, if it's a later model, has an autopilot system. It's called cruise control, and it's another classic example of a control system. Cruise control automatically regulates the speed of your car using a feedback loop that involves a speed sensor and the car's accelerator.