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https://www.noaa.gov/media/digital-library-photo/pl23map00137jpgDescription
This excerpt from International Aspects of Oceanography, an NSF publication, waswritten by Wayland Vaughn of the Scripps Institution of Oceanography in 1937 and describes the contribution of both echo-sounding and the navigation systemtermed Radio-Acoustic Ranging (RAR) to the mapping of the seafloor. RAR wasdeveloped by the C&GS; and used to survey U.S.continental margins in the 1930's. (Image credit: NOAA Central Library Historical Collection)