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Board » Technical Support » qtVlm thread

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Posted by maitai Posts 114 Registered at 2016-02-25 08:15:33	2020-04-15 19:45:45 - Re: qtVlm thread
	Hi there, There is an option for that in general config, routes tab (Beep when routing/simp/etc)
Posted by Satori Posts 10 Registered at 2020-06-16 21:08:44	2020-08-28 15:56:17 - Re: qtVlm thread
	Satori is a relative newcomer to SOL and I am documenting what I am learning from generous SOLers. Attached are my introductory instruction notes with screen prints in PDF format for “Editing Route With New Weather Report and Uploading Resulting New Delayed Commands to SOL”. Attachments QtVLM_Intro_Satori_aug2020.pdf (6.8 MB)
Posted by VIbex Posts 24 Registered at 2020-06-01 23:54:58	2020-08-29 19:17:03 - Re: qtVlm thread
	Hi, Satori, looks interesting. Perhaps simplify the list of DCs by removing unnecessary duplicates? There must be a tool to do that. Also, constantly changing cc's when a single twa will do the trick will be slower, since you take a performance hit every time you change direction. And vice versa, if qtVlm is giving you a straight line and you change twa's to match, it'll be slower. You need to smartly switch between cc's and twa's as the situation dictates. It's the same IRL -- sometimes you go to a waypoint, other times you sail by-the-lee. Also, on your qtVlm screens, it looks like you're updating a route generated from a previous routing. But with a new weather grid, you may need to rethink your strategy and follow a whole new path. Re-optimizing an old routing is not going to get you what you want, I don't think -- you should start from scratch on each weather update. I suggest setting up a pathway and creating routings from that, especially on long ocean passages. As the race progresses, you can remove early pathway points and use the remaining pathway, starting from the boat. You'll also find special situations when the race is longer than the grid forecast. Will be useful to have an update on tactics after the upcoming Osaka race. If you use the new Sailonline iOS client for iPhones/iPads, there are some additional helpful hints. Happy to collaborate.
Posted by VIbex Posts 24 Registered at 2020-06-01 23:54:58	2020-08-29 19:20:19 - Re: qtVlm thread
	Also, there's a nice even more introductory intro to qtVlm here: http://solfans.org/blog/routing/qtvlm/introduction-to-qtvlm/
Posted by mfa_wsg Posts 25 Registered at 2020-03-21 13:34:15	2020-08-30 15:04:08 - Re: qtVlm thread
	Super writeup Satori. Pivot points figured out from the videos. --- Last Edited by mfa_wsg at 2020-09-01 13:05:30 ---
Posted by Kipper1258 Posts 177 Registered at 2015-06-18 22:08:49	2020-09-13 22:54:18 - qtVlm performance
	Two things. Firstly, I have noticed that Simpilfy/Optimise runs orders of magnitudes fast if the qtVlm window is minimised (on Windows 10), and no graphics updates are happening. Can I make a suggestion that a configuration switch is added to disable graphics updates when Simplification/Optimisation is in progress. I think it will make a huge improvement in performance. Secondly, I'm running a Dell Displaylink, and qtVlm does not seem to be able to recognise that I have a graphics card loaded. Consequently, all rendering is done in software. Java recognises and uses the card, by qt (C) does not. Any ideas?
Posted by mfa_wsg Posts 25 Registered at 2020-03-21 13:34:15	2020-09-24 20:39:26 - Re: qtVlm thread
	Two questions: 1. How do you control level of simplification and optimization? (I've been just stopping them mid process) but are there subtleties and knobs to tune? 2. can you get wind speeds to show up on the arrow points? I found an old photo in Bimmer's thread that had the speeds showing. TX. in advance as usual!!
Posted by VIbex Posts 24 Registered at 2020-06-01 23:54:58	2020-09-25 02:00:54 - Re: qtVlm thread
	In Grib->Grib configuration (or the windsock in the toolbar, or ctrl-G), there's a Label configuration item to show a number. I don't know that you can control the level of simplification and optimization, other than Optimum/Maximum (the names of my next 2 dogs, and I'll never know which is which).
Posted by Satori Posts 10 Registered at 2020-06-16 21:08:44	2020-10-01 16:55:47 - Re: qtVlm thread
	If you read my Carib Rum Run 2020 Report you will see how I am making early use of Qt. Can I encourage a discussion lead by those who know better on Qt Settings and how they impact results - Boat Settings/Tacks & Gybes, Route Settings-Best Performance vs Best Accuracy, Edit Route - Wind/Polar Corrections.
Posted by Satori Posts 10 Registered at 2020-06-16 21:08:44	2020-10-01 17:22:59 - Re: qtVlm thread
	Tx Vibex for your advice on WX Route updates vs creating a new Route. Unfortunately I did not see it until after the Carib Rum Run Race. You will see from my Report on that Race that I found out for myself during the Race. I might have done better than 9th if I had seen your advice earlier!!

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