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  • John .. thanks for your POV. No "concern" here on my part .. just a want of understanding. 
    Today 14:31
  • I still ponder this thought experiment from time to time....

    One way to achieve much of what I'm trying to achieve is to have some way of declaring a mark to be an obstruction at which rule 19 applies.  Currently this can be done if the mark is a continuing obstruction, but I think inflating buoys that are 3 boat lengths long might be a bit tiresome!

    Anyway, rule 19 is pretty good... other than the way it is written.   If I could somehow get boats to race twilight fleets where 19.2(b) always applied at every mark, then I think the fleet could remember that and would sail safer.





    Today 08:52
  • "Shortening the course" is an important reason to understand the difference between passing and rounding marks too.

    With all this discussion of passing and rounding marks, I want to highlight one of the important aspects of rounding marks.  Rounding marks are one of the few places that an RC can shorten a course and finish.  For instance, looking again at US103, since the SI's did not identify any of the marks as rounding marks, it would have been an error if the RC shortened or changed the course at any of the marks. 

    This is important as sometimes you can have marks designated as rounding marks that the string touches but does not "wrap" around it.  In those instances, depending upon the wind direction, the lay lines may be such that a boat may decide for strategic/tactical reasons to sail a course that does not bring them close to the mark (staying close to shore out of current for instance).  Boats that do that run the risk that the RC might finish at that mark.

    Therefore even though an advantageous layline may not take you close to the mark, it's a good idea, if there is any chance the race would be shortened, to sail at least close enough to all rounding marks so that you can see if an RC boat is there ready to finish. 

    32.2 To shorten the course, the race committee shall display flag S with two sounds before the first boat crosses the finishing line. If the course is shortened, the finishing line shall be,

    (a) at a rounding mark, between the mark and a staff displaying flag S;
    (b) a line the course requires boats to cross; or
    (c) at a gate, between the gate marks.
    Tue 15:36
  • Done.
    25-Nov-19 01:17
  • As several people here have pointed out, the test of whether a boat's proper course is to sail to the mark is just that, a test. It does not convey any right to sail a proper course, only to sail a course directly to the mark. The World Sailing Rule 18 Working Party, of which I was a member, knew this would be confusing and worked hard to figure out how avoid having that test. We were unable to find a reasonably concise description of what we wanted, so we kept the wording about a boat's proper course being to sail close to the mark.  

    So if the test is confusing, why have it? The reason is simple: The whole purpose of rule 18 is to enable boats to get around or past marks in some orderly way without giving keep-clear boats more room than they need  to do that.  In some situations, boats sail through the zone of a mark without sailing to it -- consider boats sailing past a limiting mark, or finishing a couple of boatlengths from one end of the finishing line. In those cases, we do not want a keep-clear boat with mark-room to have the right to turn toward that mark when she would not ordinarily do so.. One test of whether a boat would ordinarily do something is pepper course, so we went with that. 
    25-Nov-18 22:15

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