Try this one. Real-time global view of all registered ships. You can click on any little triangle or type in a ship's name and see it's location:

https://www.marinetraffic.com/en/ais/home/centerx:-37.3/cent...

It's not completely real-time unless you pay to get satellite tracking included. The free version only has data from shore based AIS scanners plus a few scanners placed on ships. So close to shore it's pretty accurate, but in the middle of the ocean you only get position and vessel type (unless there's a ship with an AIS scanner nearby).

This is so cool, what I was hoping/expecting the post to be like

this is much better and informative.

TIL the Rhine–Main–Danube Canal. Thanks