Jon, does this also improve symbols and text for High Resolution High DPI screens under Windows 11?

It may do. The API function being used mentions windows and macOS, but there is another API specifically for Windows. I don't have the hardware to test it out, and I don't think a virtual environment would show the issue. I have never managed to see it.

I have just put up 1.8.64.0 into alpha that has the windows DPI scaling, I hope. Can you give this a try?

Using 1.8.64 the Ocpn_draw Icons are better, perhaps even a little too large, but at least I can see them.

I find most of the symbols to be too small, and the associated text in the rollover yellow notes is also to small.

Text size is lacking consistency and proper scaling in many cases.
Symbol sizing is lacking in most symbols I think.

There is and example of good size text and too small text which I will include a screenshot of.

Using DR, I got stuck once and could not get out, and I couldn't find the DR either. I finally hit escape and exited which is normal action. However I realized this is centered around the boat location and zooomed there. Then I could see what was happening. Couldn't DR do the zooom?

Same for the other boat associated actions? If the boat is not in the screen or at a good scale?
Maybe this is a different Issue....

Can we move this discussion to the OD github, possibly the one that has the 'similar' issue on macOS?

I have tried 1.8.63.0 on a 2560x1600 and it seems to be OK.

I have a route and boundary and the display icons 'seem' to be of a similar size.

I will try 1.8.64.0 out when it has been accepted into plugins alpha.

On my virtual system I did have to run without opengl. I wonder if that is a problem as well?

I have created a new version in the alpha repository, 1.8.65.5, that on my system seems to handle the drawing icons better. The OD Toolbar seems a little large at high scaling, i.e. 250% and above, 150% seems 'OK'ish. Can you please download the tarball and import it to your system and see if it works for you?