• Preliminary results from tests using a high-frequency sonar as trawl-sonde 

      Ona, Egil; Eger, K. (ICES CM Documents;1986/B:37, Working paper, 1986)
      A high-frequency, short-range sonar is tested for trawl-geometry measurements on pelagic and bottom trawls. The sonar was operated on a standard, coaxial trawl sonde cable, and produced excellent images of the trawl ...