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Board » Technical Support » False TWA = 0

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Posted by
kalle


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2007-06-01 09:58:04
2010-12-06 15:42:48 - Re: False TWA = 0
Did you measure the gap? :) Not saying it wasn't large enough in this case, but that is the root of the problem described above, it's possible to zoom in so much that a visible gap can in reality be a few centimeters.
Posted by
A2


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2009-10-26 00:39:42
2010-12-06 15:51:46 - Re: False TWA = 0
I did not measure said gap nor did I take a screen capture to document the situation as it was not my intention to make an issue out of the circumstance. In fact I jokingly referred to it as getting ice=bound in chat. However as more folks joined in to discuss it happening to them RC kept imploring anyone of us to submit this to the forum as I have done. There you have it. If it is past the time to have the ability to examine the tracks from the race then I suppose we are at the end of it.
None so blind
Posted by
kalle


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2010-12-06 15:57:12 - Re: False TWA = 0
It's great that this was brought up, and posting it in the forum is definitively the right way, information in the client chat is quickly lost, but here we can keep it for reference if we encounter the same thing again.
Posted by
nacrr


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2010-01-01 15:57:17
2010-12-06 16:31:59 - Re: False TWA = 0
No, I didn't measure the gap. I believe I've sailed closer to land without this happening in previous races.

nacrr
Posted by
A2


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2010-12-06 17:39:14 - Re: False TWA = 0
As I have previously stated at max zoom there was enough room for at least 6 boat widths as represented by the normal silhouette.
None so blind
Posted by
kalle


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2010-12-07 08:51:57 - Re: False TWA = 0
Yes yes, but the boat icon size is fixed in *pixels*, not in the earth coordinate system :) At high zoom each pixel could represent a a very very very small distance on earth .
Posted by
76Trombones


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2009-08-03 18:04:56
2010-12-07 11:26:30 - Re: False TWA = 0
Max zoom is fixed more or less though isn't it? Or is it system dependent?

The boats is question were sailing close to, but parallel to the shore. The distances varied, but in all case were greater than margins that we typically allow on roundings or at the pin. The only difference from "normal SOL procedure" were that the run along the beach was very long, and the beach was well North.

You could not project forward along the cc tracks and hit land even many minutes forward. This is why the boats appeared to "just stop".

Is boat position calculated/displayed with greater precision than land? Are the coasts "jagged"?
Posted by
A2


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2010-12-07 11:53:21 - Re: False TWA = 0
Just to reiterate this particular anomaly was not randomly placed amongst several boats but seemed to have a distinctly localized presence. Which is to say that each of these cited references occurred within close proximity to each other along the first 10% of the coastal stretch previously described and not in the following portion in which the boats were actually drawing closer to land as they proceeded up the coast to the eventual apex to be cleared.

Could there have been Islands so small that they did not register on the screen and yet snagged a few but not all of the fleet ?

--- Last Edited by Hubert Bonisseur at 2010-12-07 11:59:01 ---
None so blind

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