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    Re: Relative plotting vs Geographical plotting
    From: Trevor Kenchington
    Date: 2002 Jan 12, 8:50 AM

    Brian Whatcott wrote:
    
    > One might assume that a person attending a traditional navigation list might
    > 1) be interested in International rules
    > 2) be operating a sailing vessel.
    >
    > In this case, the windward vessel keeps clear and passing side signals are
    >   not given, rather, a turn to port/starboard indication is provided in
    > close quarters.
    
    The International Collision Regulations, in Part B -- Steering and
    Sailing Rules, Section II -- Conduct of Vessels in Sight of One Another, require:
    
    "Notwithstanding anything contained in the Rules of Part B, Sections I
    and II, any vessel overtaking any other vessel shall keep out of the way
    of the vessel being overtaken". [This particular wording is from the
    Canadian regulations but it is likely identical in meaning to all other
    national implementations of the international rules.]
    
    That provision supersedes the precedence of sail over power, starboard
    over port, leeward over windward and even of a vessel restricted in her
    ability to manoeuvre over everything else (though going slowly in front
    of one of those while it overtakes is NOT recommended). In short, when
    approaching any vessel from more than two points abaft her beam, you are
    required to keep clear.
    
    There is no requirement for the overtaking vessel to opt for one side or
    the other of the vessel being overtaken.
    
    
    Trevor Kenchington
    
    
    --
    Trevor J. Kenchington PhD                         Gadus{at}iStar.ca
    Gadus Associates,                                 Office(902) 889-9250
    R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
    
                        Science Serving the Fisheries
                         http://home.istar.ca/~gadus
    

       
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