J. A. Pierce, who has played a large part in the successful development in the United States of the radio navigational system known as Loran (LOng RAnge Navigation) [see p. 152 of this issue].

The RF & SatNav Laboratory, more formally “The Radio Frequency and Satellite Navigation Laboratory”, is the preeminent academic laboratory for the research and investigation of software defined radio ...

An inertial navigation system (INS ... much in the same way that quartz radio crystals are tuned to a specific frequency. The resonator is then coated with an ultra-thin metallic film.