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 8 9 10 11 12 13 14 Next Last

Posted by
Sebensa


Users avatar

Posts
70
Registered at
2010-10-06 14:50:36
2016-12-29 17:06:30 - Re: qtVlm thread
OK, let me frame it a bit differently, can one adjust qtVlm vmg calc's ? Dankie :-)
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2016-12-29 18:49:44 - Re: qtVlm thread
You are speaking about VMG or VBVMG?

VMG calculations in qtVlm are rounded to the nearest degree, if I remember well.
Posted by
kroppyer


Users avatar

Posts
347
Registered at
2010-02-05 15:25:55
2016-12-29 23:49:11 - Re: qtVlm thread
We are not familiar with VBVMG, can you explain or link us to an explanation?

Sebensa is simply referring to the angle a that gives the maximal/minimal value for boatspeed(a)*cos(a). If it's rounded to the nearest degree, QtVLM can be off by enough-to-loose-some-distance in some cases. If you want integer VMG angles, I would suggest you calculate the VMG=boatspeed(a)*cos(a) for the two nearest integer values of the optimal angle, and choose the one with the best VMG. This will be at least as good as rounding to the nearest integer value.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2017-01-02 11:08:01 - Re: qtVlm thread
Happy new year to all

In short, VBVMG consists in doing ortho when possible, and polar best-VMG-Wind when it is not.

We have the same formula for VMG (hopefully). The values are precalculated with a precision of 0.1 kts for TWS and 0.1° for TWD.
Posted by
Kipper1258


Users avatar

Posts
248
Registered at
2015-06-18 22:08:49
2017-01-05 05:17:23 - Enhancement Request - auto delete of route waypoints when passed
I have an enhancement request. Would it be possible to automatically delete route waypoints that are "passed"? For a route that is connected to the boat, a waypoint is considered "passed" when the angle between boat COG and the bearing to the next waypoint in the route exceeds 90 degrees. That is, you are now going away from the waypoint, and no longer towards it.

The reason I ask is that quite often, I find an older routing , after deleting passed waypoints and re-optimising, is faster than a newly created one. If you have six or seven routes alive, it takes quite a while to update them all with each new Wx.

Thanks
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2017-01-07 14:17:01 - Re: qtVlm thread
Viva Philippe.

Good afternoon.

A small issue with Grib files merging.

I’ve loaded in Slot 1 the Grib file “TEcnLLTTOoSYmtRzKDl0e75I4HAjqDApvb6.grb” and in Slot 2 the Grib file “TEcnLLTTOoSYmtRzKDl0e75I4HAjqqDApvx.grb”.

After I’ve merged the two files in the file “GRIB MARINE, 07.01.2017.grb”.

If I load separately both files in Slots 1 and 2 I get it correct.

But if I load the merged file, only the lower part of the (merged) Grib is shown.

What is the problem?

Thank you.

João / psail



--- Last Edited by JB at 2017-01-07 14:19:03 ---
Sail Fair.
Attachments
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2017-01-07 14:20:16 - Re: qtVlm thread
For some reason the second Grib didn't went . Goes now.

João / psail
Sail Fair.
Attachments
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2017-01-30 15:30:21 - Re: qtVlm thread
Viva all,

Good afternoon.

Last qT version (5.4.7) when we close it, it crashes (with or without GPS on).
It is an issue that already happened. After it was solved and, came back again on the last release.

Any suggestion to avoid this, pls.

Thank you
João/psail
Sail Fair.
Posted by
maitai


Users avatar

Posts
114
Registered at
2016-02-25 08:15:33
2017-01-31 11:21:28 - Re: qtVlm thread
No crash here, and I don't have any reports like that from other users so far. Can you send me your qtVlm files (*.dat, *.ini) please?
Posted by
JB


Users avatar

Posts
305
Registered at
2013-03-07 08:54:34
2017-01-31 12:00:15 - Re: qtVlm thread
Viva Philippe,

Thank you for your help.
Pls, see e-mail.

Big Hug
João/psail
Sail Fair.

Page: First Previous 8 9 10 11 12 13 14 Next Last

Please login to post a reply.

Races

Next Race: 00d 00h 00m

Current Races:

Koshiki PYOC Sprint 2025


For the first time since 2017 we return to the islands and shima’s offshore Nagasaki, Japan. This time our crafts of choice are X-35’s. Just 23nm in a straight line but choose your course wisely.
Race 1954
INFO by brainaid.de
X-35 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
SPRQ3 - SPRCH - SUPSOL – SYC
Race starts: Sep 20th 15:00 Registration will open soon
▶ Flash
GO TO RACE

Silverrudder 2025


Ahoy, SOLers! Get ready for the epic Silver Rudder – Challenge of the Sea! This 125nm single-handed race around Denmark’s island of Funen is back—shallow waters, narrow straits, and shifting winds await. This year, we trade up to our single-handed X-99s—can you master their power where precision counts most? It’s the world’s largest solo regatta, and your virtual helm is calling! Chart your course, trust your instincts, and race for glory in this ultimate test of seamanship!

It is imperative that you read AND understand these special Starting Conditions for SILVERRUDDER 2025:
Starting Conditions!!
Race #1948
INFO by brainaid.de
X-99 Single-handed PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Sep 19th 09:00 Registration Open!

▶ Flash
GO TO RACE

Rome to Tripoli 2025


The next race in the ARCH series will take us almost straight from Rome to Tripoli. But don't expect this 550nm race to be an easy one. The Mediterranean always offers some surprises. So let's prepare your Lagoon 55 with due care and... Fair Winds.
Race #1943
INFO from brainaid.de
Lagoon 55 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
ARQ3 - ARCH - SUPSOL – SYC
Race starts: Sep 15th 17:00 Registration Open!
▶ Flash
GO TO RACE

Carib Rum Run 2025

Welcome to the Caribbean and Sailonline’s legendary Carib Rum Run! This year we trade tall ships for pure speed as we race our sleek Santa Cruz 70s on a 1759nm slalom through the rum islands. Yer mission: plunder barrels from the region’s finest distilleries and deliver ‘em to the rum-thirsty sands of Cancun, Mexico. Finish on or before International Talk Like a Pirate Day, 19 September, to etch yer name in legend! Join SYC before race end and ye scallywags can disguise yer boat with a pirate name for this race only! Hoist the sails, sharpen yer cutlasses—the rum run awaits!
Race #1944
INFO by brainaid.de
Santa Cruz 70 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Sep 15th 00:00 Registration Open!
▶ Flash
GO TO RACE

Roslagen TIMED Sea Race

Welcome to quite possibly the most challenging TIMED race of the year. This month finds us in Sweden with lots of islands and narrow passages when we sail our Seacart 30 trimaran over the 86nm from Lidingö outside Stockholm to the beautiful coastal village of Öregrund. Consider yourself a winner if you complete the course nonstop! 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 #1945
INFO by brainaid.de
Seacart 30 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
TRQ3 - TRCH - SUPSOL - SYC
RACE CLOSE: Saturday,
20 September at 23:00 UTC
Race starts: Sep 07th 12:00 Registration Open!
▶ Flash
GO TO RACE

Great Nicobar to Marion Island 2025

The Adventure Continues – Leg #6 of the RWW Series.
We’re setting sail on the next stage of the RWW Series: a 4,400-nautical-mile passage from Great Nicobar to Marion Island. This demanding leg will test endurance, strategy, and seamanship at the highest level. As part of the 2025 Ocean Championship, this marks the ninth legendary challenge in the series — and one of the most exhilarating yet. The race will be contested aboard the Archer 78’ ketch, a vessel built to push sailors to their limits across the vast Indian Ocean.
PRIZE: SMPF
Race #1942
INFO by brainaid.de
Archer 78 PARTICULARS    
WX Updates:
0430 / 1030 / 1630 / 2230    
Ranking: OCQ3 - RWW - OCCH - SUPSOL - SYC
RACE CLOSE: Thursday,
September 25 at 2300 UTC.
Race starts: Sep 01st 11:00 Registration Closed
▶ Flash
GO TO RACE

Go to race archive

SYC Ranking

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