I'm not sure what happened with my first post; sorry if this is a repost.
I found that OpenCPN
does not transition automatically (zoom in out) between BSB
v3 and BSB
v4. I have to manually do that transition using the rectangles at the bottom.
For example, I have several BSBv4 large scale chart. There is one big smaller scale BSB v3 chart. When zooming out, it will stop at the last BSB v4 chart, it will not switch to the BSB v3 unless I click on its rectangle. The opposite is also true.
Is this normal? Thanks a lot