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Board » Technical Support » qtVlm thread

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Posted by
Sebensa


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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


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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


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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


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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


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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


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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.
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Posted by
JB


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2017-01-07 14:20:16 - Re: qtVlm thread
For some reason the second Grib didn't went . Goes now.

João / psail
Sail Fair.
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Posted by
JB


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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


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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


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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.

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