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
263
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:

Carib Rum Run 2026


Ahoy, ye landlubbers and seasoned salts! Welcome back to Sailonline’s legendary Carib Rum Run, perfectly timed to kick off on International Talk Like a Pirate Day, 19 September!

This year, we command the magnificent Falkun—the ultimate high-tech superyacht modeled after the iconic Maltese Falcon. This 1759nm slalom takes us through the Caribbean’s rum islands to plunder barrels from local distilleries and deliver them to the rum-parched sands of Cancun.

Join SYC before the finish to disguise yer boat with a pirate name for this race only. Hoist the sails, sharpen yer cutlasses, and plot your winning course!
Race #2060
INFO by brainaid.de
Falkun PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking: SYC
Race starts: Sep 19th 05:00 Registration Closed
▶ Flash
GO TO RACE

Shearwater - Rio de la Plata to Irish Sea 2026

Welcome to the fourth leg of our MIG series. This time we're racing the Sooty Shearwater on their migration from the breeding grounds in South America to the northern Atlantic. This is also part of our Ocean Championship, and as such the third race of OCQ3 2026. This race will be sailed in our Gunboat 90. Race #2055
INFO by brainaid.de
GunBoat 90 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
OCQ3 - OCCH - SYC - MIG
RACE CLOSE: Thursday,
October 1 at 2300 UTC.
Race starts: Sep 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 CriticalHippo
  3. Sailonline Yacht Club Member WRmirekd
  4. Sailonline Yacht Club Member rafa
  5. Sailonline Yacht Club Member cdhinman
  6. Sailonline Yacht Club Member Panpyc
  7. Sailonline Yacht Club Member rumskib
  8. Sailonline Yacht Club Member rthinman
  9. Sailonline Yacht Club Member BRENTGRAY
  10. Sailonline Yacht Club Member Sax747

View full list

Series

Mobile Client

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

The mobile client