A classical azimuth-range navigation system is conventional radar, which consists of a transmitter, a highly directional antenna, a receiver, and a display. The transmitter produces EM microwave pulses that are propagated in a narrow beam. The EM waves strike objects at various distances. The greater the distance to the target, the longer is the delay before the echo is received. The transmitting antenna is rotated so that all azimuth bearings can be observed.