Silly Question ...?

[juancho38]

What is the (blue ? / black ?) line that is displayed behind the COG line (red) ?

[Dave_S]

I can't see it on the pic but you will have course over ground and one will be your heading. I.e. you are not going where you are pointing through windage or current.

[juancho38]

Yes there is current, COG and heading are different.
But you can see following the COG (red dash) there is something else underneath (you can see it in between some dashes ... blue, black, grey ?).
May be only a OpenGL display issue.
Just to make sure I did not miss something ...

[rgleason]

Not silly at all

https://opencpn.org/wiki/dokuwiki/do...ps_status_icon

Heading, COG,

Options - Own Ship - Display Options
https://opencpn.org/wiki/dokuwiki/do...isplay_options

The grey dashed vector is not Tracks or Highlighted tracks
https://opencpn.org/wiki/dokuwiki/do...g:ships#tracks

Do you have AIS look ahead mode on?

https://opencpn.org/wiki/dokuwiki/do..._buttons:ais&s[]=grey&s[]=dashed#ais

[transmitterdan]

Originally Posted by juancho38

What is the (blue ? / black ?) line that is displayed behind the COG line (red) ?

Juacho38,

I think this is related to the resolution of your display. In your opencpn.log file can you see a like like this?

5:56:46 AM: Metrics: m_display_size_mm: 344 wxDisplaySize: 1920:1080

What is the wxDisplaySize of your display?

[juancho38]

Originally Posted by transmitterdan

What is the wxDisplaySize of your display?

I indeed have a line :
3:14:22 PM: Metrics: m_display_size_mm: 344 wxDisplaySize: 1920:1080

My screen default display is 1920x1080, that should be ok.
I have a INTEL HD 620 graphics, I have read somewhere there could be some display issues with OpenGPL with this card, I presume this may be the case.

It is not a big issue anyway !

[juancho38]

Originally Posted by rgleason

The grey dashed vector is not Tracks or Highlighted tracks ?

Do you have AIS look ahead mode on?

No track or highlighted track.
I don't have AIS, can it be a invalid AIS display of my own ship ?
AIS look ahead mode - I do not find this option ...

OpenCPN AIS manual / AIS Target Quick Graphic References

Note that AIS targets reporting position unavailable will be rendered in grey colour.

This makes me think that OpenCPN tries to display the AIS signal about my boat, but don't find proper AIS signal.

... can be a OPENGL display issue with my graphic card (Intel Graphics 620)

[juancho38]

AIS look ahead mode - I do not find this option ...

I found it ... it is not active, activating does not change anything regarding our subject.

[transmitterdan]

Juancho38,

It is some minor bug related i think to the special ship icon you have used. It is causing no problem and you have done nothing wrong.

[juancho38]

Originally Posted by transmitterdan

It is some minor bug related i think to the special ship icon you have used. It is causing no problem and you have done nothing wrong.

I don't think so ... I tried with the default icon, removing ownship.png, this "underneath gray line" is still there

[transmitterdan]

Originally Posted by juancho38

I don't think so ... I tried with the default icon, removing ownship.png, this "underneath gray line" is still there

I know it’s a bug. I just don’t know why your system experiences it. It has to do with a combination of several things such as the screen resolution, the position of the GPS receiver relative to ship’s center, size of ship icon, and the line widths of the drawn lines. Some of these line widths and offsets are automatically computed by the OpenCPN code.

For now my advice is to just ignore the extra black dashed line. If we need more data from you to solve the bug someone will ask you.

[barnakiel]

Higher res screen may solve this. As might a lower one.


b.

[transmitterdan]

Originally Posted by barnakiel

Higher res screen may solve this. As might a lower one.


b.

I have the same screen resolution but cannot reproduce the problem. I can see in the code how it might be affected by screen resolution but the root cause is illusive. In any event, this is only a cosmetic issue and no serious problem exists.

[juancho38]

... just a cosmetic issue, that all I wanted to know !
Ignored
Thanks for your support.