A STATISTICAL METHOD OF CORRECTING LOG SPEEDS

The measurement of ship speed by a log is discussed, with emphasis on the sources of systematic errors. Simple functions to correct for these errors are proposed. Multiple regression analysis is applied to data extracted from the log books of three fast cargo ships. The ratio of the noon-to-noon distance measured astronomically to the noon-to-noon distance measured by a log, the dependent variable, is related to terms which contain the wind speed and its direction relative to the ship, the wave height and relative direction, the draught and time. These equations improve the accuracy of the speed through the water as measured by the log. Order from: BSRA as No. 48,463.

  • Corporate Authors:

    Royal Institution of Naval Architects, England

    10 Upper Belgrave Street
    London SW1X 8BQ,   England 
  • Authors:
    • Babbedge, N H
  • Publication Date: 1977-7

Media Info

  • Features: References;
  • Pagination: 3 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00178308
  • Record Type: Publication
  • Source Agency: British Ship Research Association
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM