thanks for your answers.
I solve the first prob with the plugins. I deinstalled all the opencpn packages including the plugins and the main program. Then I installed them again but over the grafik menue of the pi not from the LX-console.
It works now.
Pavel it´s like your way, unfortunally I read your post after my try-and-error way.
Now the only prob is, that the pi loose the settings for the plugins from opencpn.
In the log file I can find out that the pluginmanager will first load the plugins and then deactivate them
Picture of the opencpnlog see attachment.
Hope you can help me to solve this little prob too.