The marine industry is seeing the introduction of numerous sophisticated instruments capable of solving many shipboard operational problems. Many of these equipments are dedicated to navigation and the related problems of collision avoidance; as such, they require reliable and accurate ship's speed as an input. Additionally, many applications require speed data as a visual readout to interface with the human computer. The requirement for a suitable speed measuring system has, until now, been satisfied with a variety of instruments ranging from the chip log of bygone days to very sophisticated EM logs in use by the Navy today. All of these equipments have certain common failings such as difficult calibration procedures resulting from the sensing probe being located within the ship's boundary layer, vulnerability to fouling and damage of the sensing probe by virtue of its protruding beneath the hull, poor accuracy, and low reliability.

  • Supplemental Notes:
    • Presented at the Eastern Canadian Section Meeting of SNAME, Quebec, November 7, 1972.
  • Corporate Authors:

    Society of Naval Architects and Marine Engineers

    601 Pavonia Avenue
    Jersey City, NJ  United States  07306-2907
  • Authors:
    • Howard, M J
  • Publication Date: 1972-11

Media Info

  • Features: References;
  • Pagination: 32 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00071674
  • Record Type: Publication
  • Source Agency: Society of Naval Architects and Marine Engineers
  • Files: TRIS
  • Created Date: Nov 12 1974 12:00AM