If the AI plane traffic in real time traffic really gets to work, then maybe it could also be possible for ship traffic. I was contacted by one of the largest European passenger and freight ferry companies, DFDS, and they have provided everything needed in terms of ship documentation and AIS input in order to make it possible - that is if Asobo makes it technically possible in the sim. For now I have added a lot of the DFDS ships in the update - we are not at the entire fleet yet but we will get there - and you will find them on their real routes, but not in real time for the moment.
Ephesus Seaways is one of DFDS’ brand new ro/ro freight ferries operating both on the North Sea and the Mediterranean , which has been added in the new package - below a link to the real deal for comparison
https://photos.marinetraffic.com/ais/showphoto.aspx?photoid=3361530&size=1600