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Tack when by the lee

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    Posted: 16 May 21 at 5:25pm
Thanks one and all, I knew my logic was flawed but hadn’t deleted deep enough. 

Leeward and Windward A boat’s leeward side is the side that is or, when she is head to wind, was away from the wind. However, when sailing by the lee or directly downwind, her leeward side is the side on which her mainsail lies. The other side is her windward side. When two boats on the same tack overlap, the one on the leeward side of the other is the leeward boat. The other is the windward boat.
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Post Options Post Options   Quote GML Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 21 at 12:54pm
Buy the RYA version and you don't need a bookmark as the definitions are immediately inside the front cover (precisely so that you can find them without having to hunt for them).
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 21 at 11:53am
Yes, I suggest everyone has a bookmark to the definitions in their rules book. Its just as important as the actual Part C rules.
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Post Options Post Options   Quote sargesail Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 21 at 11:47am
Exactly MartinG. In The RRS in the definition Tink quotes the word windward is in italics, indicating that the term is defined. Reference to that definition resolves Tink’s confusion.
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Post Options Post Options   Quote MartinG Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 21 at 7:31am
But you need to look at the definitions of leeward and windward.
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Post Options Post Options   Quote tink Quote  Post ReplyReply Direct Link To This Post Posted: 16 May 21 at 6:44am
RRS say

‘Tack, Starboard or Port A boat is on the tack, starboard or port,
corresponding to her windward side.’

Therefore by the definition it is the gunwale the wind blows over that determines the tack, and a boat BTL can flick from port to starboard without the boom changing side.

However I have seen some net posts saying it is the boom side which I feel is wrong however would make interpretation much easier. A observer would find it difficult to spot a boat was BTL especially if the sail is wet and telltales not working very well. 
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