Do Tugboats still exist? I'm curious because when I went to Odaiba which is manmade island in Tokyo Harbor and there are lots of big ports out there.

I saw an enormous ship clearing parking by itself. It occured to me that maybe with GPS and computers these big ships can basically park themselves now. No need for Tugboats anymore. How do I find out if this is true? Maybe it's only true in Japan or maybe it was just that ship.

I searched for Tugboats on google.com but nothing relevant came up

Does anybody know?