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Tacking on a mark, room to keep clear? |
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Brass
Really should get out more Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1146 |
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Topic: Tacking on a mark, room to keep clear? Posted: 24 May 19 at 2:35pm |
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ohFFsake
Far too distracted from work Joined: 04 Sep 08 Location: United Kingdom Online Status: Offline Posts: 219 |
Post Options Quote Reply Posted: 30 May 19 at 9:32am | |
One other practical point to add to the mix...
Presuming we are all now agreed that A is grant mark room to B until the instant she passes head to wind, at which point rule 18 switches off in its entirety. From this moment on, B must now keep clear of A (Rule 13), but this presumes that A maintains her current course. If A alters course towards B then she is a ROW boat and must allow B room to keep clear (Rule 16.1) A situation I have encountered several times is where two boats end up in this scenario, B heads up to the mark and A follows, but then A continues to alter course once B commences her tack, subsequently blaming B if there is then an incident. My understanding from the above is that the instant B reaches head to wind, A cannot then continue to alter course if doing so would prevent B from keeping clear. Or in practical terms if A chooses to follow B around the mark once they have tacked they must now in effect keep clear. The only scenario in which B would be to blame if there were an incident would be if A remained on a steady course from the instant that B passed head to wind. |
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Sam.Spoons
Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3398 |
Post Options Quote Reply Posted: 30 May 19 at 10:24am | |
I think that is the point, they are approaching the mark and when B tacks yellow (A?) will hit blue either just before head to wind or just after unless she bears away under her stern.
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Brass
Really should get out more Joined: 24 Mar 08 Location: Australia Online Status: Offline Posts: 1146 |
Post Options Quote Reply Posted: 30 May 19 at 1:22pm | |
And if it goes to a protest hearing, the protest committee should apply the principle of last point of certainty: up to and including when B reaches head to wind (Definition: Leeward and Windward), B was on starboard tack, entitled to mark-room. She remains in that status until it is clear or certain that she has passed head to wind. Hitting B is high risk for Y. Y is better to take action to avoid B and protest. |
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ohFFsake
Far too distracted from work Joined: 04 Sep 08 Location: United Kingdom Online Status: Offline Posts: 219 |
Post Options Quote Reply Posted: 02 Jun 19 at 10:56am | |
As ever, the confused, muddied waters made crystal clear by Brass!
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Rupert
Really should get out more Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
Post Options Quote Reply Posted: 02 Jun 19 at 5:11pm | |
I really like the last point of certainty principle. It is one of the clearest concepts for dealing with complex situations. It might not get the answer right, as such, but in this case, where both boats may genuinely believe they are in the right, as we could be talking a couple of degrees of course change, it ensures clarity of decision making.
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