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:

Rapallo to Nador 2026


Welcome to Liguria’s Rapallo, there where Zarathustra spoke - at length - to Nietzsche, for our first race of nine to celebrate all things Mediterranean - fickle winds, history and olive oil. A number of our races in this new Magical Mediterranean series will be partnership with famous real-life races, but this first race is pure fiction - 780nm in refurbed IMOCA 60s, past or through the Balearic Isles and on into the Alboran Sea, to a finish off Nador on the Maroc Mediterranean coast.
Race #1975
INFOby brainaid.de
IMOCA 60v2 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: MED - SYC
Race starts: Mar 30th 15:00 Registration will open soon
▶ Flash
GO TO RACE

Red Eye - Melville Island PYOC 2026

Melville Island is the largest of the Tivi group opposite the port of Darwin in the Timor Sea. Tropically forested and thinly populated, not a lot goes on there, but let’s race around it anyway, lar- or starboard round, it’s a little more than 120nm, so, no matter where you are navigating from on the planet, you will be hard-pressed to complete the course aboard your J-80 in daylight hours!
Race #2003
INFOby brainaid.de
J-80 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: RED - SYC
RACE CLOSE: Tuesday,
March 31 at 2300 UTC.
Race starts: Mar 24th 12:00 Registration Open!
▶ Flash
GO TO RACE

Cross the Convergence 2026 - Guam to Ouvéa


The third race of our series of ocean voyages across the World’s convergence zones takes us southeastward now down the Pacific, from Guam’s Apra Harbour at 13.5 degrees North, back across the Equator to the glorious New Caledonian resort island of Ouvéa, on the edge of the Tropic of Capricorn at 20.5 degrees South. It’s 2400nm, and there’s more than a few other islands in the way, so mind where you go in your Ocean 50s. Race #1981
INFOby brainaid.de
Ocean 50PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: CCZ - SYC
Race starts: Mar 20th 18:00 Registration Closed
▶ Flash
GO TO RACE

Lake Victoria TIMED Race 2026

This month’s TIMED race takes us inland to Lake Victoria in the heart of Africa. Starting at Rosebery Channel in Uganda sail the AC72v2 on a 196nm course around Bugala Island on the way to the finish line in Tanzania’s Speke Gulf. This is a TIMEDrace so you may RE-REGISTER HEREto try again after finishing a run. You will have 13 days and 11 hours to test your skill and decision making after the race opens.
Race #2018
INFOby brainaid.de
AC72v2 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ1 - TRCH - SYC
RACE CLOSE: Saturday,
28 March at 23:00 UTC
Race starts: Mar 15th 12:00 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 rafa
  4. Sailonline Yacht Club Member rumskib
  5. Sailonline Yacht Club Member Sax747
  6. Sailonline Yacht Club Member vida
  7. Sailonline Yacht Club Member CriticalHippo
  8. Sailonline Yacht Club Member CollegeFund
  9. Sailonline Yacht Club Member Panpyc
  10. Sailonline Yacht Club Member sassy63

View full list

Series

Mobile Client

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

The mobile client