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 » qtVlm thread

Page: First Previous 6 7 8 9 10 11 12 Next Last

Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-11-29 08:52:01 - qT barriers problem.
Viva all.

Since some time I have this issue concerning the use of barriers.

The qT I'm using is the version 5.4-3 Nov 1.2016.

Now the issue (pls see also the attached PDF file).

1 - I've open a Grib file for the West Atlantic.

2 - Created a new barrier in the China Sea.

3 - When I zoom to all the Grib's grid space I get two horizontal lines that come from the China Sea created barrier!?

4 - If I want to make a routing N-S in the Atlantic intersecting the Latitudes of those two horizontal lines, I just can't,

5 - unless I clean that barrier.

I would like to know if:

A - This is a problem?
B - The rest of the qT users have the same issue (assuming it is one)?

Thank you.
Sail Fair.
Attachments
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-11-29 20:10:51 - Re: qtVlm thread
Can you send me your poiReal.dat please (I guess this is already corrected but just to check)

--- Dernière modification par maitai le 2016-11-30 07:58:14 ---
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-11-30 08:58:36 - Re: qtVlm thread
Viva Philippe,

Good morning.

I’ll send you the requested file (“poiReal.dat”) but mind you that, meanwhile, I had to remove the Sea China barrier so I could perform the Atlantic routings. Otherwise it was impossible to do it, unless changing the routing option for “Avoid barriers”, which is not an option if we really need “barriers” to be active.

Even now, that I’m making a routing for the X2X race, the polylines from other barriers are generating outside the actual Grib Grid horizontal barrier lines on other areas of the globe.

Thank you & BH
João
Sail Fair.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-11-30 09:43:53 - Re: qtVlm thread
Thanks for the report João
That's fixed and will be in the next release, due very soon, probably today.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-11-30 22:12:02 - Re: qtVlm thread
5.4.4-beta1 out on VW (http://www.virtual-winds.org/forum/index.php?/topic/7575-qtvlm/&do=findComment&comment=271697).

Please take your chance to complain/report/suggest before official release ;)
Posted by
Bimmer


Users avatar

Posts
447
Registered at
2015-02-23 15:38:27
2016-12-10 06:52:28 - Re: qtVlm thread
Hey Phillippe
When I draw a heading, the numbers are so small that I can't read them.
Is there a way to enlarge them?
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-12-14 15:34:25 - Re: qtVlm thread
Confusion when increasing TWS Wind Grib.

Viva Philippe.

Good afternoon.

In the qT tab “Advanced settings” tab included in the “Routing settings” menu, there is an option to increase the Wind speed by a percentage that you specify - pls see also attached PDF file.

Made a first test routing with no increase (100%) in the Wind speed and got the first route (blue path).
After, I’ve made a second test routing the Wind speed increased by 15% (115%) and got a second and different route from the first one (purple path).

But what puzzled me was the info I’ve got from qT before the second routing became the second route:

“This routing has been calculated with an assumption modifying grib data”, (so far so good).

The problem came after when, in the same info window had this:

“The route will not take this scenario into account.
Are you sure you want to convert to route?”!?

Well, the two routings were made from the same start and finish marks, starting exactly at the same time. The only different was a15% increase in the TWS for the second routing.
Anyhow, I’ve got two different routes.

The question.

If, as said in the info window that: “The route will not take this scenario into account.”, how and why do we obtain two different routes?

Does it really takes, or not, the effect on the routing and corresponding route the TWS increase?

Thank you and
a BH.

João/psail
Sail Fair.
Attachments
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-12-14 17:07:36 - Re: qtVlm thread
The what-if mechanism only applies to routings, not routes. So once converted in a route you loose them.

You get 2 differents routes because although the route ignore this setting the routing founds other points, of course. So the 2 routes are different, but they are using the same wind.

There is another way to achieve what you want:

In configuration->grib, you can specify a global correction on wind (TWS). Run a routing with this modification, convert it in a route etc, and then FREEZE the route. Then you can reset this setting (or change it) and do a routing->route again, and compare the routes.

Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2016-12-14 17:33:25 - Re: qtVlm thread
Viva Philippe.

Haha, thank you for this good tip (“TWS correction”).

This was precisely what I needed.

BH

João/psail
Sail Fair.
Posted by
DirtyRat1402


Users avatar

Posts
4
Registered at
2015-07-01 09:40:49
2016-12-16 06:13:02 - Grib2 Variables: PRES loads but PRMSL does not
I've directly downloaded some grib2 files from the NOMADS server which include pressure. One uses PRES variable and the other uses PRMSL. Only the PRES one will render the pressure information. I'd prefer to use the PRMSL version if we can get it to work. I've attached the PRMSL grib file for testing.
Attachments

Page: First Previous 6 7 8 9 10 11 12 Next Last

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

San Diego Islands Race 2026


Sailonline is proud to once again partner with the San Diego Yacht Club for the annual Islands Race! This iconic offshore challenge spans approximately 140 nautical miles, starting in Long Beach, rounding the Catalina Islands, and finishing in San Diego. Shifting coastal winds and tactical island roundings will test every sailor’s judgment and nerve.

This year, our SOLers will race the Ker 40, a proven high-performance design by Jason Ker and built by McConaghy Boats. Fast, responsive, and demanding, the Ker 40 rewards precision and smart strategy. The competition will be tight. Every decision will count. See you on the start line!
Race #2009
INFO by brainaid.de
Ker 40 PARTICULARS
NAM_AWIP WX Updates:
0245 / 0845 / 1445 / 2045
Ranking:
SUPBUD - SYC
Race starts: Feb 13th 20:00 Registration will open soon
▶ Flash
GO TO RACE

Los Roques 2026


It's winter but not in the Caribbean, so welcome to Venezuela's Islas Los Roques archipelago for a 20nm sprint through these beautiful islands. Take care with your mutinous crew, they may be tempted to BBQ and snorkel!
Race #2007
INFO by brainaid.de
SOTO 30 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
RANKING:
SPQ1 - SPCH - SYC
RACE CLOSE: Wednesday,
February 11 at 2300 UTC.
Race starts: Feb 07th 13:00 Registration Closed
▶ Flash
GO TO RACE

Cross the Convergence 2026 - Samoa to Hawaii


The second race of our new series of ocean voyages across the World’s convergence zones, takes us northward again up the Pacific Ocean, now from Samoa at 13.5 degrees South, across the Equator to Hawaii, famed for its breaking surf and active volcanoes, on the edge of the Tropic of Cancer at 19.5 degrees North. It’s 2300nm, so we’ll take our very steady Steinlager II. Race #1982
INFOby brainaid.de
Steinlager IIPARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
Race starts: Feb 06th 18:00 Registration Open!
▶ Flash
GO TO RACE

Beketov by Balloon 2026 - In Siberia


Way-back-when France and England, and Spain as well, were squabbling about who should control what of North America, only to lose the most of it to their own insurging colonists, their eastern European neighbour empire, Russia, was quietly assimilating vast, thinly nomadically populated territory of its own – Siberia! Amongst the many explorers and adventurers that served Russia so well in these conquests was the Cossack hetman Pyotr Beketov. Let’s pretend we’re he and eschewing horseback, let’s travel by balloon from Yekaterinberg to Krasnoyarsk – just a short 2000km (1100nm) section of the Trans-Siberian Express’ 9289km!
Race #1972
INFOby brainaid.de
SOL Balloon PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: BOL - SYC
Race starts: Feb 03rd 13:00 Registration Closed
▶ Flash
GO TO RACE

West Papua to Oregon 2026

Our next race in our Ocean Championships is the first of a series of great natural migrations we will track in 2026. The leatherback turtle is the most widely distributed marine reptile on planet Earth, and chooses to breed in warm tropical waters, but prefers to forage in more temperate habitats, travelling thousands and thousands of miles effortlessly annually to maintain this way of life. Our race will follow one of the typical trips of this turtle, from breeding grounds in the seas off West Papua to the coast of Oregon. It’s only 5900nm, so to keep up, but in comfort, we’ll follow in our Gunboat 90.
Race #2006
INFO by brainaid.de
GB 90 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ1 - OCCH - MIG - SYC
Race starts: Feb 02nd 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member KaSToR
  2. Sailonline Yacht Club Member WRmirekd
  3. Sailonline Yacht Club Member CriticalHippo
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member rumskib
  6. Sailonline Yacht Club Member Sax747
  7. Sailonline Yacht Club Member vida
  8. Sailonline Yacht Club Member bonknhoot
  9. Sailonline Yacht Club Member Panpyc
  10. Sailonline Yacht Club Member Kipper1258

View full list

Series

Mobile Client

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

The mobile client