Berthing aids now used in Rotterdam-Europort for mammoth tankers are all based on the sonar principle. The sonar used is an echo sounder transmitting on a horizontal plane. Two "ears" are used as a rule, so that information is obtained about the ship's speed and angle in respect to the jetty. The echo sounders are placed at a considerable depth below the surface to avoid other craft, such as tugs, from being sounded as well. Three methods are used for visually transmitting the information to the ship. The first method indicates both velocity and distance on a kind of clock. The second system indicates distances in the same way, but, velocity is shown by means of a kind of traffic light - green for safe, yellow for critical, red for dangerous. The third system indicates distance on an illuminator in blocks representing two metres and velocity is shown by red, yellow and green lights. Distance and speed are also recorded to subject the movements of ships to statistical processing.

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  • Corporate Authors:

    Fuel and Metallurgical Journals Limited

    Queensway House, 2 Queensway, Redhill
    Surrey RH1 1QS,   England 
  • Publication Date: 1976-12

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Filing Info

  • Accession Number: 00149373
  • Record Type: Publication
  • Source Agency: Fuel and Metallurgical Journals Limited
  • Files: TRIS
  • Created Date: Apr 13 1977 12:00AM