Hey Gertjan,
in Belgium it's a very stange law about the use of a Vhf.
Some channels are free to use without a certificate, i mean you can monitor but may not intercommunicate although i know for shore that for Maritime channels you need a certificate, because thats one of the first things the maritime police asks when they check your documents.
In Holland en Great Brittain it's somewhat more complicated, you have the right to own a Vhf but you may not use it (I don't quiet understand it either)
Concerning the ATIS, there are portable posts that have the ATIS module build in, on the other hand this radio has to be registered because each time you make a qso, you send your own individual information with the ATIS module, and landstations and some vessels can locate you by radar if they have an RDF installed (Range Direction Finder)
Regards...