So I’m not familiar with the boating regulations in Europe but I can tell you that in Texas ANY craft/vessel/ board dingy even a $5 inner tube that has a propulsion device besides oars or paddles or sails must be registered and display the registration stickers where they can be seen and you have to have the registration paperwork on the boat or on your person. If you don’t comply you get a $500 fine each time you are caught. And I had a Sevelor 3 person dingy ( cost about $80 with a 30 lb minn Kota electric trolling motor on it . Putting around in front of my house and when I came to the dock the game wardens from parks and wildlife were waiting there to give me my $500 ticket. I made the argument that you just made that the motor cost more than the boat and that it was silly to be expected to register a toy like that. Then I was told again ANYTHING that is on the water and has a motor MUST be registered and display tags or be fined $500 each ciolatkl