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Rule 10 or rule 18?
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Presuming Ed View Drop Down
Really should get out more
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Joined: 26 Feb 05
Location: United Kingdom
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Posts: 641 		Post Options Post Options   Quote Presuming Ed Quote  Post ReplyReply Direct Link To This Post Topic: Rule 10 or rule 18?
    Posted: 21 Aug 12 at 7:45pm
No rule trumps. Different rules place different requirements on each boat. 

C is windward of A. C must keep clear of A as a windward boat (11).  C also, as an inside overlapped boat, has right to mark room from A. 

A is leeward of C. As RoW boat wrt C, A must alter course in such a way as to give C room to keep clear (16.1). C must give A mark room. 

A is on port, and B is on starboard. A must keep clear of B (10). As inside overlapped (by definition) boat, B has to give A mark room. When B alters course, she must give A room to keep clear (16.1). 
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JimC View Drop Down
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Joined: 17 May 04
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 12 at 7:09pm
SECTION A
RIGHT OF WAY
A boat has right of way when another boat is required to keep clear
of her. However, some rules in Sections B, C and D limit the actions
of a right-of-way boat.

So rule 10 is valid, but is restricted by rule 18. By your description the outside boat didn't give required room and should take a penalty.
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JohnnyJupiter View Drop Down
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Joined: 21 Aug 12
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Posts: 7 		Post Options Post Options   Quote JohnnyJupiter Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 12 at 6:51pm
Situation: Two Beetlecats approaching the leeward mark, both running by the lee. The mark will be taken to port. Inside the zone, boat A is on port tack and is the inside boat with an overlap on boat B.  Boat B is on starboard tack.  Boat B (outside boat) calls "Starboard!" and bumps into boat A; B's port rail hits A's starboard rail, a light tap/rub, no damage, no change of course by either boat.

Question: Which rule 'trumps'?  Rule 10 says boat B (outside boat) has rights because B is on starboard.  Rule 18 says boat A (inside boat) must be given mark room.

Possible extenuating circumstances (I don't know if these are germane to the question):

1. Rounding the mark, boat A (inside) will merely harden up while boat B (outside) will gybe. Rule 18.1.b states rule 18 does not apply at all (quoting the rule here): "...when the proper course at the mark for one but not both of them is to tack."  In this case, neither boat tacked: one gybed, one just hauled in.  So IMHO rule 18 applies...agree or disagree?

2. Actually there were three Beetles.  On boat A's port side was another boat C, also on port tack with an overlap on A and B.  Boat A was giving C room at the mark.  Does C constitute an obstruction for A?  If so, doesn't that mean B has to give A room?

My weak attempt at a diagram below. Posted by a newbie, please advise if I can supply more information.  Thanks very much for your time and comments.
--JJ
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