chart directory navigation - flatpack version

[Copprhead]

I had the same problem. This is caused by flatpack sandbox restrictions: https://docs.flatpak.org/en/latest/sandb...sions.html

But you can allow additional folders. To allow access to the folder /ssd/charts for example, you need to run the following in a terminal:
flatpak override --user org.opencpn.OpenCPN  --filesystem=/ssd/charts