Avation Aid is a term used to describe the use of an autopilot system in aircraft. An autopilot is a system that can be used to control and navigate an aircraft without the need for a human pilot. It is typically used during long-distance flights, allowing the aircraft to fly on its own while the pilot takes a break or attends to other tasks. The autopilot system is able to maintain the aircraft's altitude, speed, and heading, as well as make corrections to keep the aircraft on course.