ADCOCK RANGE - National radio navigation system replaced after World War 2 by the omnirange system. It consisted of segmented quadrants broacasting Morse Code \"A\" (dot-dash) and \"N\" (dash-dot) signals in opposing quadrants so that pilots could orient their position relative to a \"beam\" broadcasting a steady tone, and a Morse Code station identifier. Using a \"build-and-fade\" technique, a pilot could (ideally) pinpoint his location by the strength or weak