I know your original post is in Danish and I have not got the first clue what you are saying. But your title of the post got my attention.
Have you thought about contacting the World Ship Socitey in the UK, we are a World Wide Organisation and that might help you or give you some ideas towards setting up your Shipspotting clube or perhaps setting up a Denmark Branch.
Regards
Glenn
World Ship Soctiey
Hobart, Tasmania, Australia