WELCOME ABOARD, Alexlab!
As Meduza posted the best link, there's not much more to explain. The supermods are all great, and all have harbor traffic coming and going, including pretty much historical ship movements.
Germany only had one aircraft carrier,
Graf Zeppelin, and she was never completed. You can see her in Kiel harbor in 1939 with GWX. Also the battleships and cruisers are there during the correct historical time frames.