The chief criticism which has always been made against the existing Collision Regulations and is now being made against the revised ones, is that, except for the end-on encounter, no directives are given as to how the vessel should manoeuvre to 'keep out of the way'. The work done in the early nineteen-sixties showed that if miss distances and contributions were given positive and negative signs depending on the rotation of the physical and computed sight-lines, then, as far as the mathematics were concerned, a uniform treatment was in fact possible. However this early work did not lead to a set of directives acceptable to mariners in general. The present paper takes this method of attack further, and shows that if the return to course is included in the treatment, then all close-quarter encounters between two vessels can be covered by one simple formula. This formula not only clarifies what may be called the 'mechanism' of avoidance; it can also be used to provide operational information (as opposed to directives), which may turn out to be more useful than the maneuvering diagrams which were the practical outcome of the early work.

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  • Corporate Authors:

    Royal Institute of Navigation

    1 Kensington Gore
    London,   England 
  • Authors:
    • CALVERT, E S
  • Publication Date: 1973-4

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Filing Info

  • Accession Number: 00084665
  • Record Type: Publication
  • Source Agency: Royal Institute of Navigation
  • Files: TRIS
  • Created Date: May 19 1975 12:00AM