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

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
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 ---
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.
Thanks for the report João
That's fixed and will be in the next release, due very soon, probably today.
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 ;)
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?
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
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.

Viva Philippe.

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

This was precisely what I needed.

BH

João/psail
Sail Fair.
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:

Auckland to Noumea 2025


The ARCH competition is transitioning now from the Arabian Sea to the Pacific Ocean, featuring a 1000 nm route from Auckland to Nouméa. Organized by the Royal Akarana Yacht Club, the race last occurred in 2018 and was set to resume on May 25, 2024, after a lengthy hiatus. However, due to political unrest in New Caledonia, the event has been cancelled. Fortunately, those situations do not impact our virtual race, so prepare your Open 60 for another exciting adventure.
Race #1888
INFO from brainaid.de
Open 60 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
ARQ1 - ARCH - SUPSOL – SYC
Race starts: Feb 10th 17:00 Registration Open!
▶ Flash
GO TO RACE

Tyger Memorial Race 2025

Dear Robert Neilson, gone too soon, but, a volunteer crew having brought his Tyger home in our first Ocean Race of 2025, here is a further opportunity to remember him and his great contribution to Sailonline, by blasting around an 80nm triangle on his home waters of Port St Philip Bay in spanking-new-to-SOL very-Robert very-macho, grind-greedy Cookson 50s. Tell tales of his derring-do in Chat or add something for posterity to his Tyger IN MEMORIAM Forum page. Sail on, SOLer.
Race #1891
INFOby brainaid.de
Cookson 50 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Feb 08th 06:00 Registration Open!
▶ Flash
GO TO RACE

Sinbad by Balloon 2025 - Dondra to Toamasina


Above you see a stratospheric balloon, that if only we had gribs at that altitude would get blasted along quite rapidly and predictably. Alas we just have our SOL balloon that sails rather lower to the sea and that we have crossed the Atlantic in, west to east, last year for the first time in the southern hemisphere. So much fun was had by all, that this year we will attempt the Indian Ocean, but in four legs. Another great piece of fiction, the voyages of Sinbad By Balloon not magic carpet, although you may need a bit of magic to make any progress at times. Pack your wicker basket full for your first leg of at least 2300nm from Sri Lanka to Madagascar; it’s not a picnic hamper, you could be in the air for longer than you hoped!
Race #1883
INFOby brainaid.de
SOL Balloon PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC - SBB
Race starts: Feb 05th 11:00 Registration Open!
▶ Flash
GO TO RACE

Barbados to Tristan da Cunha 2025

Sailonline is proud to present to our virtual sailors, an all new series RWW 2025 (Round our Water World). Sailing from remote island to remote island with forever only a faintly curving line between sea and sky on the horizon. "Dry land is not a myth". The series ranking uses best 7 from 8 races for scoring, and this first race, from Barbados to Tristan da Cunha, a 4000nm leg into the Southern Atlantic, will be sailed in ex-Volvo OD65s (version 3). The race is also part of the OCCH 2025, ranking best 10 from 12 races.
PRIZE: SMPF
Race #1889
INFO by brainaid.de
OD65v3 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: OCQ1 - RWW - OCCH - SUPSOL - SYC
Race starts: Feb 03rd 11:00 Registration Open!
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

  1. Sailonline Yacht Club Member WRmirekd
  2. Sailonline Yacht Club Member CriticalHippo
  3. Sailonline Yacht Club Member vida
  4. Sailonline Yacht Club Member FreyjaUSA
  5. Sailonline Yacht Club Member Patrick70119
  6. Sailonline Yacht Club Member rafa
  7. Sailonline Yacht Club Member Kipper1258
  8. Sailonline Yacht Club Member Satori
  9. Sailonline Yacht Club Member KaSToR
  10. Sailonline Yacht Club Member CollegeFund

View full list

Series

Mobile Client

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

The mobile client