This excerpt from International Aspects of Oceanography, an NSF publication, was
written by Wayland Vaughn of the Scripps Institution of Oceanography in 1937 and
describes the contribution of both echo-sounding and the navigation system
termed Radio-Acoustic Ranging (RAR) to the mapping of the seafloor. RAR was
developed by the C&GS and used to survey U.S.continental margins in the 1930's.