Facebook

Login

Support Sailonline

If you haven't already - join the SAILONLINE YACHT CLUB!

Please also consider making a donation - all amounts are greatly appreciated!

Board » Technical Support » False TWA = 0

Page: Previous 1 2

Posted by
kalle


Users avatar

Posts
413
Registered at
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


Users avatar

Posts
347
Registered at
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


Users avatar

Posts
413
Registered at
2007-06-01 09:58:04
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


Users avatar

Posts
55
Registered at
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


Users avatar

Posts
347
Registered at
2009-10-26 00:39:42
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


Users avatar

Posts
413
Registered at
2007-06-01 09:58:04
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


Users avatar

Posts
362
Registered at
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


Users avatar

Posts
347
Registered at
2009-10-26 00:39:42
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

Page: Previous 1 2

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Lake Ontario 300 Challenge 2026

Lake Ontario Offshore Racing (LOOR) welcomes Sailonline sailors to a second virtual version of a race in their annual series, and for the sixth year in succession the LO300. As the name implies, the LO300 is a 300nm offshore race across the length and breadth of Lake Ontario, from and back to Port Credit YC. This year, for the first time, we will be racing the 300nm circuit in Sun Fast 3200s. As usual, there is an overall prize for the SOLer who best bosses Lake Ontario over the two races hosted by Sailonline, this LO300 and the Susan Hood raced back in May, and this year also the race and the Susan Hood count towards the title of Super Buddy 2026; so, let the competition be fierce!
Race #2044
INFOby brainaid.de
Sun Fast 3200 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: LOOR - SUPBUD - SYC
Race starts: Jul 11th 15:10 Registration Open!

▶ Flash
GO TO RACE

Tall Ships 2026 - Harlingen to Antwerpen


Welcome to the second of four virtual Tall Ships Races in European waters which are concurrently being organized in-real-life by Sail Training International . This second race is from Harlingen in Friesland down along the coast of Holland and Friesland to Vlaanderen’s famous port of Antwerpen – circa 150nm in Sailonline’s classic Clipper 240.
NOTE: Starts and Finishes in tall ships racing are always offshore to avoid conflict with shipping and shipping lanes; online and real-life may not match exactly.
Race #1993
INFO by brainaid.de
Clipper 240 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: TSI - SUPBUD - SYC
Race starts: Jul 06th 16:00 Registration Open!
▶ Flash
GO TO RACE

Alaska to Easter Island 2026

Welcome to yet another all-new series. The initial leg of the RNW (Round the New World), Alaska to Easter Island, also part of our Ocean Championship. The first race of OCQ3 2026. This race will be sailed in our revised 'version 2' Imoca 60 Foil. Race #2042
INFO by brainaid.de
Imoca 60 Foil v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ3 - RNW - OCCH - SYC
Race starts: Jul 06th 11:00 Registration Open!
▶ Flash
GO TO RACE

Cross the Convergence 2026 - Sao Tomé to Tristan

The fifth race of our series of ocean voyages across the World’s convergence zones takes us back south down the Atlantic from Sao Tomé on the Equator to Tristan da Cunha on the edge of the Roaring Forties. It’s 2500nm; in your path the Benguela winds and current along the south west African coast, and behind that the St Helena High stretching halfway to South America. So, mind where you go in your Volvo OD65 version 3 (based on sampled real-life race data by kroppyer)!
Race #1985
INFOby brainaid.de
Volvo OD65v3 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
Race starts: Jul 03rd 18:00 Registration Open!
▶ Flash
GO TO RACE

New Ice Age 2026 - Neumayer Station to Scott Base


For a second-half of long-distance ice-boating, we take our DNs to Antarctica for a circumnavigation of that continent in two legs clockwise, in harmony with the prevailing winds (such as there are), beginning with a race from Germany’s Neumayer Station to New Zealand’s Scott Base. It’s about 3500nm, which, if there’s wind at all, should, well-wrapped in your DN-cockpits, not take you much more than five days. And remember: charts down here are unreliable – what is land and what is ice?!
Race #1970
INFOby brainaid.de
DN PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: NIA - SYC
Race starts: Jul 02nd 07:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member WRmirekd
  2. Sailonline Yacht Club Member KaSToR
  3. Sailonline Yacht Club Member CriticalHippo
  4. Sailonline Yacht Club Member bonknhoot
  5. Sailonline Yacht Club Member Panpyc
  6. Sailonline Yacht Club Member cdhinman
  7. Sailonline Yacht Club Member rafa
  8. Sailonline Yacht Club Member HoratioPugwash
  9. Sailonline Yacht Club Member YANN
  10. Sailonline Yacht Club Member ms0689

View full list

Series

Mobile Client

SYC members have the benefit of access to our mobile/lightweight web client!

The mobile client