Login
Support Sailonline
If you haven't already - join the SAILONLINE YACHT CLUB!
Please also consider making a donation - all amounts are greatly appreciated!
Page: First Previous 23 24 25 26 27 28 29 Next Last
Posted by Kipper1258 |
|
Looks like it's working. The link was missing the .exe which I've updated below.
Thanks https://www.virtual-winds.org/maitai/qtvlm_setup_5.8.6-beta4.exe |
|
Posted by JB |
|
In past years we saw a quick evolution not only on weather routing software but also on sidekicks aiding tools.
One of the best weather routing programs used around the corner is qTVlm. Since the very first versions it has been upgraded in a good rhythm bringing also a plethora of innovations, sometimes using info and suggestions gathered from the community. Anyhow, one qT aspect that has been roller coasting is the Optimizing/Simplifying algorithm processes applied to the calculated routing WPTs. It is very simple to verify that in spite of using the “Optimum Simplify” process first, and "Optimize" after (applied only once or several times), normally we won’t get the best ETA - even before any trimming operation on the fixed calculated WPTs, the ones in “red” color generated around land/rocks/barriers and on the remaining "green" movable ones. The cause for this is identified. Is a direct consequence of the used decimating algorithm implemented in qT for the “Simplify”/ “Optimum” processes. In recent versions - 2018 - this issue was aggravated as the decimating operation during the “Simplify” process stopped being uniformly applied along the routed path, leaving us to the somehow paradox of having more remaining WPTs in the end of the route, precisely where the predictability of the WFs are worse, which is a contra sense. There are ways to overcome this issue but, again with another contra sense, as you have to spend more time rehabilitating an over decimated routed path by adding new WPTs. Every WPT over decimated is a less one degree of freedom in the generated curve, giving here the main reason for qT going in opposite direction of the optimum ETA. Sincerely hope that qT responsible persons take once for all this issue and, at least bring back the “old” decimating algorithm, the uniform “cutter”. João/psail Sail Fair. |
|
Posted by maitai |
|
Joao, you should also mention that you are using settings that I strongly say you should NOT use...
Running a routing with 5mn isochrons can only lead to disappointment in most cases. If I allow for 1sec isos would you use it? 1ms even better? Even less? Using such a small amount of time between isos creates way too many points that are likely to look useless to the simp process, which can only do what it is aimed to do: simplifying (i.e. remove the point if the ETA is not worst). Since there is not enough room between points it will end up by over simplifying. Conclusion is that there is a good reason behind the default values, what else can I say? Modify them at your own risk, but do not complain if you don't like the result. I could add a few things: 1) Routing with 5mn interval on a 3 days travel is just ridiculous knowing that the real wind is different from the grib's wind and that anyhow next grib update will just completely rebate the cards. 2) qtVlm is not specifically designed for SOL and will never be. qtVlm is designed for real sailors or racers and does not try to give an exact answer to an infinite problem. It is just a toolbox that can help to decide where to go. 3) qtVlm is also used in official scientific projects and is also used by very famous racing teams over the world. No one is using 5mn isochrons, there must be a reason. 4) We are opened to suggestions and improvements and even complains. But it need to be reasonably compatible with the real world, and concerning bugs it needs to be reproducible with reasonable settings. Happy Xmas to all Philippe. --- Last Edited by maitai at 2018-12-25 14:16:38 --- --- Last Edited by maitai at 2018-12-25 14:17:03 --- |
|
Posted by JB |
|
Hi Philippe and all.
Good afternoon. Well, the settings I’ve been using a long time (since they were available) are the same, so I don’t have any induced distortion on comparing results generated with different settings. Those settings have proved to give results in all kind of WFs and with different boat Polars, being also more relevant with the faster boats, as you easily understand and as per example I sent you recently. Correct, the lower the Time Step (TS) used for calculating the Isochrones, the bigger will be number of potential WPTs. That’s the price for getting precision. The first point you mention misses rationality. We all know that ANY GRIB file won’t be exactly what you are going to sail IRL. Under that argument - yours - I ask why do we make routings? I totally agree with your second point and part of the third. For that I can give you one plausible answer for people not using TS = 5 minutes: I takes a lot of time to get a result, not because is less precise. In relation to fourth point, previously I gave you a suggestion: bring back the old "cutter", which I now reiterate. If it doesn’t have anything to do with the used TS, what’s the problem for implementing it again? My Dear Friend have also a Merry Xmas João/psail Sail Fair. |
|
Posted by Bimmer |
|
Hi there maitai and oxygen 77. I'm writing to you as the original "matchmaker" between QtVlm and sailonline.
I am sorry to tell you that Joâo/psail have suffered from a heartattack and has deceased. He's very missed in SOL as you can read in other forum posts, and I'm also sure he'll be missed as a very determined "hawkeye" to whatever the small issues could be in our use of your absolutely amazing program. It's my hope that someone else in the SOL community will be as sharp as he was. But again - SOL, as a whole, is MORE than satisfied with using QtVlm. Thank you again --- Last Edited by Bimmer at 2019-04-29 14:01:00 --- --- Last Edited by Bimmer at 2019-04-29 14:01:51 --- |
|
Posted by maitai |
|
Very sad news. We had a lot of exchanges to improve qtVlm usage with sailonline.
All my thoughts to his friends and family. |
|
Posted by sol |
|
skippers,
Concerns QtVlm version 5.8-9 If you export a QtVlm-route to csv to generate values for brainaids dc-tool you will see that QtVlm has inserted some new columns. COG is found now some columns to the right. If you use your 'old' convertor now you get knots in stead of degrees you expect. greetings LacSareno --- Last Edited by sol at 2019-05-05 17:14:41 --- |
|
Posted by Bimmer |
|
Solution:
Change SOG to COG(T). See screen shots. Also works for AGL. --- Last Edited by Bimmer at 2019-05-06 11:46:50 --- |
|
Posted by sol |
|
@Bimmer,
Are you sure you want to use AWS for sign of TWA? I think TWA now will get always the same sign. LacSareno --- Last Edited by sol at 2019-05-07 14:01:14 --- |
|
Posted by Bimmer |
|
I'll look into that, thanks LacSareno
|
Page: First Previous 23 24 25 26 27 28 29 Next Last
Please login to post a reply.Races
Next Race: 00d 00h 00m
Current Races:
Nassau to Bodo 2024
PRIZE: SMPF
Race# 1866
INFO from brainaid.de
Swan 65 PARTICULARS
WX updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ4 - OCCH - RTW - SUPSOL - SYC
Race starts: Nov 11th 11:00 Registration Open!
GO TO RACE
Macias Nguema Sprint 2024
This weekend SOL invites you to get from one side of Macias Nguema to the other? Not sure where this island paradise is? Use the fleet overlay to find out then pick your own route over the 45nm and get acquainted with the area in your 60ft Trimaran
Race #1867
NOR from brainaid.de
60ft Trimaran POLAR
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
SPRQ4 - SPRCH - SUPSOL – SYC
Race starts: Nov 09th 21:00 Registration Open!
GO TO RACE
The Beagle in the Bay of Islands 2024
And west the Beagle went again to reach the Bay of Islands on the east coast of New Zealand’s North Island on the 19th of December. Darwin was not nearly as impressed by the inhabitants here, commenting that the Maori natives were “savages with the character of a much lower order than the Tahitians” and many of the English settlers were of “the most worthless character” and “included runaway convicts”, not anticipating that less than 200 years later a blend of these characteristics would combine to create a nation of serial Rugby World Cup Winners – evolution, eh, Charlie! The Beagle sailed on swiftly, but we will stay a little longer and explore c 200nm of the North Island’s glorious eastern coast, up and down, as ever in our replica Tall Ship Class B.
Race #1756
INFOby brainaid.de
Tall Ship Class B PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SVF - SYC
Race starts: Nov 04th 13:00 Registration Open!
GO TO RACE
Ushuaia to Nassau 2024
We extend a warm welcome to the 5th leg of the RTW challenge, a thrilling journey from Ushuaia in the Land of Fire to Nassau in the Caribbean. It also marks the October edition of our esteemed Ocean Race Championship. Covering a distance of 6300 nautical miles, this leg is anticipated to span approximately 29 days. Join us for an unforgettable adventure on the high seas, where skill, strategy, and camaraderie converge in the pursuit of victory. We look forward to seeing you at the starting line! Fair winds and following seas.
PRIZE: SMPF
Race# 1842
INFO from brainaid.de
Swan 65 PARTICULARS
WX updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ4 - OCCH - RTW - SUPSOL - SYC
RACE CLOSE: Wednesday,
November 13 at 2300 UTC.
Race starts: Oct 07th 11:00 Registration Closed
GO TO RACE
SYC Ranking
Series
- SYC ranking
- 2024 TS
- 2024 TRQ4
- 2024 TRQ3
- 2024 TRQ2
- 2024 TRQ1
- 2024 TRCH
- 2024 TD
- 2024 SVF
- 2024 SUPerSOLer
- 2024 SSANZ
- 2024 SPRQ4
- 2024 SPRQ3
- 2024 SPRQ2
- 2024 SPRQ1
- 2024 SPRCH
- 2024 SHE
- 2024 RTW
- 2024 RMS
- 2024 PIC
- 2024 OCQ4
- 2024 OCQ3
- 2024 OCQ2
- 2024 OCQ1
- 2024 OCCH
- 2024 LOOR
- 2024 HILAT
- 2024 GWT
- 2024 DN
- 2024 CRW
- 2024 B2B
- 2024 ARQ4
- 2024 ARQ3
- 2024 ARQ2
- 2024 ARQ1
- 2024 ARCH
- 2023 TS
- 2023 TRQ4
- 2023 TRQ3
- 2023 TRQ2
- 2023 TRQ1
- 2023 TRCH
- 2023 TD
- 2023 SVS
- 2023 SUPerSOLer
- 2023 SSANZ
- 2023 SPRQ4
- 2023 SPRQ3
- 2023 SPRQ2
- 2023 SPRQ1
- 2023 SPRCH
- 2023 SHE
- 2023 RTW
- 2023 RNI
- 2023 RMS
- 2023 PIC
- 2023 OCQ4
- 2023 OCQ3
- 2023 OCQ2
- 2023 OCQ1
- 2023 OCCH
- 2023 LOOR
- 2023 DN
- 2023 ARQ4
- 2023 ARQ3
- 2023 ARQ2
- 2023 ARQ1
- 2023 ARCH
- 2022 TRQ4
- 2022 TRQ3
- 2022 TRQ2
- 2022 TRQ1
- 2022 TRCH
- 2022 TD
- 2022 Tall Ships
- 2022 SUPerSOLer
- 2022 SSANZ
- 2022 SSA
- 2022 SPRQ4
- 2022 SPRQ3
- 2022 SPRQ2
- 2022 SPRQ1
- 2022 SPRCH
- 2022 SHE
- 2022 OCQ4
- 2022 OCQ3
- 2022 OCQ2
- 2022 OCQ1
- 2022 OCCH
- 2022 NTR
- 2022 LOOR
- 2022 CTR
- 2022 ARQ4
- 2022 ARQ3
- 2022 ARQ2
- 2022 ARQ1
- 2022 ARCH
- 2021 TRQ4
- 2021 TRQ3
- 2021 TRQ2
- 2021 TRQ1
- 2021 TRCH
- 2021 TD
- 2021 Tall Ships
- 2021 SYCQ4
- 2021 SYCQ3
- 2021 SYCQ2
- 2021 SYCQ1
- 2021 SYCCH
- 2021 SUPerSOLer
- 2021 SSANZ
- 2021 SPRQ4
- 2021 SPRQ3
- 2021 SPRQ2
- 2021 SPRQ1
- 2021 SPRCH
- 2021 Shetland
- 2021 PAC6
- 2021 OCQ4
- 2021 OCQ3
- 2021 OCQ2
- 2021 OCQ1
- 2021 OCCH
- 2021 ESRW
- 2020 TSE
- 2020 TSA
- 2020 TRQ4
- 2020 TRQ4
- 2020 TRQ3
- 2020 TRQ2
- 2020 TRQ1
- 2020 TRCH
- 2020 Tasman Double
- 2020 SYCQ4
- 2020 SYCQ3
- 2020 SYCQ2
- 2020 SYCQ1
- 2020 SYCCH
- 2020 SUPerSOLer
- 2020 SSANZ
- 2020 SRQ4
- 2020 SRQ3
- 2020 SRQ2
- 2020 SRQ1
- 2020 SPRCH
- 2020 Shetland
- 2020 RTW
- 2020 RNI
- 2020 Odyssey
- 2020 OCQ4
- 2020 OCQ3
- 2020 OCQ2
- 2020 OCQ1
- 2020 OCCH
- 2020 A3
- 2019 TRQ4
- 2019 TRQ3
- 2019 TRQ2
- 2019 TRQ1
- 2019 TRCH
- 2019 Tasman Double
- 2019 Tall Ships
- 2019 SYCQ4
- 2019 SYCQ3
- 2019 SYCQ2
- 2019 SYCQ1
- 2019 SYCCH
- 2019 SUPerSOLer
- 2019 SSANZ
- 2019 SRQ4
- 2019 SRQ3
- 2019 SRQ2
- 2019 SRQ1
- 2019 SPRCH
- 2019 Shetland
- 2019 Round New Zealand
- 2019 OCQ4
- 2019 OCQ3
- 2019 OCQ2
- 2019 OCQ1
- 2019 OCCH
- 2018 TRQ4
- 2018 TRQ3
- 2018 TRQ2
- 2018 TRQ1
- 2018 TRCH
- 2018 Tasman Double
- 2018 Tall Ships
- 2018 SUPSOL
- 2018 SSANZ Triple
- 2018 SRQ4
- 2018 SRQ3
- 2018 SRQ2
- 2018 SRQ1
- 2018 SPRCH
- 2018 Shetland
- 2018 Shackleton Challenge
- 2018 OCQ4
- 2018 OCQ3
- 2018 OCQ2
- 2018 OCQ1
- 2018 OCCH
- 2018 40CH
- 2017 TS RDV
- 2017 TRQ4
- 2017 TRQ3
- 2017 TRQ2
- 2017 TRQ1
- 2017 TRCH
- 2017 Tasman Double
- 2017 Tall Ships
- 2017 SWR
- 2017 SUPSOL
- 2017 SSANZ Triple
- 2017 SSANZ RNI
- 2017 SPRR3
- 2017 SPRR2
- 2017 SPRR1
- 2017 SPRCH
- 2017 Red Dot
- 2017 OCQ4
- 2017 OCQ3
- 2017 OCQ2
- 2017 OCQ1
- 2017 OCCH
- 2017 40CQ3&4
- 2017 40CQ1&2
- 2016 TRQ4
- 2016 TRQ3
- 2016 TRQ2
- 2016 TRQ1
- 2016 TRCH
- 2016 Tasman Double
- 2016 Tall Ships
- 2016 SUPSOL
- 2016 SSANZ Triple
- 2016 SRQ4
- 2016 SRQ3
- 2016 SRQ2
- 2016 SRQ1
- 2016 SPRCH
- 2016 RTWR
- 2016 OCQ4
- 2016 OCQ3
- 2016 OCQ2
- 2016 OCQ1
- 2016 OCCH
- 2016 Corporate Open Gold
- 2016 A3
- 2015 TRQ4
- 2015 TRQ3
- 2015 TRQ2
- 2015 TRQ1
- 2015 TRCH
- 2015 Tasman Double
- 2015 Tall Ships
- 2015 SYQ4
- 2015 SYQ3
- 2015 SYQ2
- 2015 SYQ1
- 2015 SYCCH
- 2015 SUPSOL
- 2015 SSANZ Triple
- 2015 SRQ4
- 2015 SRQ3
- 2015 SRQ2
- 2015 SRQ1
- 2015 SPRCH
- 2015 OCQ4
- 2015 OCQ3
- 2015 OCQ2
- 2015 OCQ1
- 2015 OCCH
- 2015 Aegean Rally
- 2014 Timed Races Championship
- 2014 Tasman Double
- 2014 Tall Ships
- 2014 SYC Championship
- 2014 SSANZ Trio
- 2014 SSANZ RNI
- 2014 Sprints Championship
- 2014 Scandinavian Tour
- 2014 Round The World Race
- 2014 Ocean Championship
- 2014-2015 Sailonline World Race
- 2013 Tall Ships
- 2013 SYC Championship
- 2013 SSANZ B&G Simrad
- 2013 Capt Anderson
- 2012 W Australia Regatta
- 2012 Tall Ships
- 2012 SSANZ B&G Simrad
- 2012 RNZ Two Handed
- 2012 Global Challenge
- 2012 Ecker Cup
- 2012 Black Sea
- 2012 A3
- 2011 Vancouver Island
- 2011 Tasman Double
- 2011 SSANZ B&G Simrad
- 2011 SOL Global Challenge
- 2011 SJORA Series
- 2011 Scandinavian Tour
- 2011 Round North Island
- 2011 Asian Sprints
- 2011-2012 SOL World Race
- 2010 Tasman Double
- 2010 Ouzo Rally
- 2010 Iberian Tour
- 2010 Auckland Regional
- 2009 French SOLo
- 2009 Bosphore - Bretagne
- 2008 SYCC
- 2008 -2013 SYC Week Race Championship
- 2008 -2013 SYC Week-End Race Championship
- 2008 -2013 SYC Ocean Race Championship
- 2008-2009 Sailonline Ocean Race
- 2004 LOOR
Mobile Client
SYC members have the benefit of access to our mobile/lightweight web client!