Image by jamesdale10 via Flickr

Complex UAVs only need a take-off pilot and a landing pilot. They use GPS and a ground system to know where to go. A computer displays a map with GPS capabilities. The navigator makes POI’s, or points of interest, and the UAV will circle or fly on a course marked by these points. The UAV follows these points giving it the ability to carry out a mission without a pilot flying it for the duration of the flight. Very few UAVs today have this ability.

Image via Wikipedia