Omega: "Professor John Alvin Pierce, the 'Father of Omega,' first proposed the use of continuous wave modulation of VLF signals for navigation purposes in the 1940's. Working at the Radiation Laboratory at the Massachusetts Institute of Technology, he proved the viability of measuring the phase difference of radio signals to compute a location solution. Mr. Pierce originally called this system RADUX. After experimenting with various frequencies, Mr. Pierce settled on a phase stable 10 kHz transmission in the 1950's. Thinking this frequency was the far end of the radio spectrum usable for navigation, Mr. Pierce dubbed the transmission 'Omega,' for the last letter of the Greek alphabet. "