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:

Carib Rum Run 2026


Ahoy, ye landlubbers and seasoned salts! Welcome back to Sailonline’s legendary Carib Rum Run, perfectly timed to kick off on International Talk Like a Pirate Day, 19 September!

This year, we command the magnificent Falkun—the ultimate high-tech superyacht modeled after the iconic Maltese Falcon. This 1759nm slalom takes us through the Caribbean’s rum islands to plunder barrels from local distilleries and deliver them to the rum-parched sands of Cancun.

Join SYC before the finish to disguise yer boat with a pirate name for this race only. Hoist the sails, sharpen yer cutlasses, and plot your winning course!
Race #2060
INFO by brainaid.de
Falkun PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Sep 19th 05:00 Registration Open!
▶ Flash
GO TO RACE

Silverrudder 2026


Ahoy, SOLers! Welcome to the 2026 edition of the Silver Rudder – Challenge of the Sea! This epic 125nm single-handed race around Denmark’s island of Funen is back!

Shallow waters and shifting winds await in the world’s largest solo regatta. This year, we return to the popular First 27 solo. This superlight, water-ballasted planing machine features twin rudders and weighs a full tonne lighter than her older stepsisters. Will you master her power where precision counts most?!

It is imperative that you read AND understand these special Starting Conditions for SILVERRUDDER 2026:
Starting Conditions!!

Race #2059
INFO by brainaid.de
First 27 Solo PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SUPBUD - RED
Race starts: Sep 18th 08:30 Registration Open!
▶ Flash
GO TO RACE

Isle of Mull TIMED Race 2026

Welcome to the west coast of Scotland for an 80 nm race around the Isle of Mull. Mull is home to castles, distilleries, and the Highland Games. The race begins just north of Oban in the shadow of Dunstaffnage Castle and after rounding the island finishes down the coast at Crinan. The Twister 28 with its classic long keel is the boat for this race.
This is a TIMEDrace so you may RE-REGISTER HEREto try again after finishing a run. You will have two weeks to test your skill and decision making after the race opens.
Race #2057
INFOby brainaid.de
PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ3 - TRCH - SYC
RACE CLOSE: Saturday,
26 September at 23:00 UTC
Race starts: Sep 13th 12:00 Registration Open!
▶ Flash
GO TO RACE

Cross the Convergence 2026 - Cocos to Sagar Island


Kapil Muni, incarnation of Lord Vishnu, founder of the Samkhya school of philosophy, disturbed from his meditation, in his wrath reduced the 60,000 sons of Sagar to ashes, as they dug the earth to retrieve the sacrificial horse that Lord Indra, the king of the Gods, stole off Sagar, thus creating the Sagara (ocean). Aeons later, Bhagiratha, a descendant of Sagara, asked Ganga to cleanse the ashes of the 60,000 princes, and her resultant torrential fall from heaven created the great river and where it met the ocean, the princes’ souls were washed and raised to heaven and Gangasagar (Sagar Island) was formed. So, let us join the pilgrimages to Kapi Muni’s Temple (see above) and race 2400nm from Cocos Island deep in the Sagara thence, in rather rapid Rapido 60s.
Race #1987
INFOby brainaid.de
Rapido 60PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
Race starts: Sep 11th 18:00 Registration Closed
▶ Flash
GO TO RACE

Shearwater - Rio de la Plata to Irish Sea 2026

Welcome to the fourth leg of our MIG series. This time we're racing the Sooty Shearwater on their migration from the breeding grounds in South America to the northern Atlantic. This is also part of our Ocean Championship, and as such the third race of OCQ3 2026. This race will be sailed in our Gunboat 90. Race #2055
INFO by brainaid.de
GunBoat 90 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ3 - OCCH - SYC - MIG
Race starts: Sep 02nd 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member CriticalHippo
  2. Sailonline Yacht Club Member KaSToR
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member Panpyc
  6. Sailonline Yacht Club Member cdhinman
  7. Sailonline Yacht Club Member rthinman
  8. Sailonline Yacht Club Member BRENTGRAY
  9. Sailonline Yacht Club Member Sax747
  10. Sailonline Yacht Club Member vida

View full list

Series

Mobile Client

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

The mobile client