Lay Line issue. explained

[petsicola]

I send you two images. First are the rated boat velocities in knots of my boat. Here you can see the beat angle. Thats the minimum angle that I can have upwind. As you can see in the image beat angle changes with different winds. the difference betwen maximum angle and minimum angle on my boat are 4 degrees. I can assume that my average beat angle are 41.9º.

When I go upwind and the angle formed betwen my destination line and true wind is less than the beat angle I have to show upwind layline

When the formed by dline and twd line is less that beat angle you have to show upwind laylines

With Layline is not important the heading of the boat.

After that we have to work at downwind layline line is the opposite and is marked at the same orc certificate with gybe angles... but that is the next leg ;)

[panaaj]

Currently a beat angle of 45 degrees is used by default unless there is a value in the performance.beatAngle path.
So to use the values in a table such as the one you provided you would have to be using a plugin that populates the performance.beatAngle value.

Laylines are currently displayed when (bearing - twd) < beat angle. So is your issue that the laylines are not displayed or that they are not dispayed using the beat angle from the polar?

[tkurki]

Would it not make more sense to show upwind laylines always when going upwind? So when heading or cog if no heading is less than 90degs off twd?

Laylines have value even if you can’t sail that high right now for one reason or another, like rounding a buoy or an island.

[petsicola]

Bearing pong to destination

Bearing to next waypoint 331.2
TWD 306
331.2-306< 45 and laylines are not shown.

[panaaj]

Would it not make more sense to show upwind laylines always when going upwind? So when heading or cog if no heading is less than 90degs off twd?

Laylines have value even if you can’t sail that high right now for one reason or another, like rounding a buoy or an island.

That is also part of the current logic.

[panaaj]

Bearing pong to destination

Bearing to next waypoint 331.2
TWD 306
331.2-306< 45 and laylines are not shown.

I cannot replicate the issue on my system so can you please provide a screenshot of the environment.wind paths from the data browser on the server.

The issue may be related to the TWD value being the magnetic path value rather than the true value so can you also advise the value of the setting "prefer True / magnetic"

[petsicola]

Yes, I send you a capture.

[petsicola]

Another thing that I see is that laylines may be not propper painted.
I created a situation in my boat with the wind direction and my buoy are on the same direction. and it gave me this laylines....
I send you a capture with the lay lines that freeboard give me and two lines created over the image with paint that I think that have to paint freeboard.
you can see that you make 90º and it has to be 45º assuming that you are taking 45º degrees. as your maximum upwind as you say me.

In the next image probably is clear.
you are painting a grey lines that grey lines are ok painted red and over that lines I show you lay lines.

Please, sorry for my poor english

[petsicola]

[panaaj]

Thanks for the details.
I have created a fix for the not correctly using environment.wind.directionMagnetic and for the line rendering.
These will be available in the next release.

[panaaj]

Fixed in v2.11.2

[petsicola]

Sorry, I have to try it more....

[petsicola]

Upwind wind vectors are perfect

The downwind wind vectors I think that the y have to be at the opoosite. I send you a picture.

[panaaj]

Hmm, they should be the other way...and were in testing.

Does it display correctly if true is preferred over magnetic?

Can you please supply a screenshot of the following paths:

• environment.wind
• navigation.course.nextPointvalues
• navigation.magneticVariation

If no magnetic variation value is available then the bearing magnetic value will be empty.

These values are used if the prefer magnetic setting is selected.

[petsicola]

This image

Here the data. In same cases the downwind image goes ok. in other cases not. but I don't know when.

[panaaj]

The screenshot below shows the result I get when testing. I cannot seem to reproduce the issue using both True or Magnetic values.

Do you also see the issue if preferred paths to either True or Magnetic or does it only happen on one of them?

[petsicola]

Yes, allways goes ok but in some situations the vectors change.
In this situation when the boat goes to north vectors are ok.

But when we turn and goes to south vectors change... I don´t know why...

[petsicola]

In some cases I see this. laylines and display vector are not intthe same line

[petsicola]

In some cases but only in downwind appears vecctors in this form.
what values I can give you to study the case.

[panaaj]

I am about to release an update that will allow you to capture the necessary data which you can then upload for debugging purposes.

I will provide instruction after the update is available.

[petsicola]

perfect, I will wait for it ;)

[panaaj]

v2.11.4 contains the debug capture option.
To use it you will need to enable Experiments in the Settings

• Open Settings and scroll to the bottom of the screen.
• Select the Experimental Features checkbox
  

Once experiments have been enabled you will be able to access the experiments button and menu.

When you experience the issue:

1. click Experiments
2. Select the Capture Debug info option. This will copy the debug info to the clipboard.
3. Paste the information into a text file and attach it to this issue.

[petsicola]

I see the capture debug info but when I clic it, it doesn't copy to the clipboard nothing.
I tried to paste it on a notepad but it doesn't work.

[panaaj]

You will need to be in a secure context either https:// or http://127.0.0.1, http://localhost,http://*.localhost or else your browser will block access to the clipboard.

So you could try a browser on the Signal K server host.

[petsicola]

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[petsicola]

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[panaaj]

Issue resolved in v2.11.5

[petsicola]

now happens at the opposite. I give you two images... in one of them goes bad and in the other when we change the tack goes ok. before. in the corner change goes bad in this direction, change the direction to the other tack and goes ok.

1º this tack goes bad

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2º this tack goes ok.

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[petsicola]

I was trying and only fails in that case... but it goes much better that the version before

[panaaj]

Value (or lack of) gybeAngle seems to be the issue.... it is null in 1.
Will update to not display mark laylines when gybeAngle is null.

[petsicola]

vectors Ok
now lay lines. In this case lay lines are not showed. I send you image and values.
and downwind laylines I think could be very usefull. and wtih it would be finished,

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[panaaj]

Downwind laylines included in v2.12.0 release.

[petsicola]

Lay lines are perfect for me. I was using vectors last week on the boat and are very useful for us.

• Lay lines and vectors are a bit thin. In some cases
• Time to lay line it would be useful because we can say to the crew when we are going to take the next tack or jibe.

I put two images to see lay lines with charts and see if people say if lines would be a bit thick.

[panaaj]

I will close this issue as it is resolved operationally.
Time to lay line can be addressed in #197.