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Online radio Malaysia, live internet radio A telemetry system transmits back a video image from a camera in the drone to allow the pilot to see where the aircraft is going, and data from a GPS receiver giving the real-time position of the aircraft. UAVs have sophisticated onboard automatic pilot systems that maintain stable flight and only require manual control to change directions. Radio Frequency Identification – identification tags containing a tiny radio transponder which are attached to merchandise. When it receives an interrogation pulse of radio waves from a nearby reader unit, the tag transmits back an ID number, which can be used to inventory goods. Radio waves are located at the low-frequency end of the electromagnetic spectrum, beneath gamma rays, X-rays, ultraviolet light, visible light, infrared radiation, radar waves, microwaves, and television waves. Dr. O. J. Lodge, who preceded Marconi in making experiments in what may be called "ray" telegraphy or radio