They’re called drone-ships, but they’re more drone-barges. You absolutely couldn’t take them all the way out into the Indian Ocean in anthing but amazing weather, and they were delivered to their current home on top of another ship.

That’s not to say you couldn’t have some kind of unmanned observer nearby, but it’ll have to be something else. Any yacht with a camera and a good drone would do the trick, you don’t need to spend (and risk) millions on custom ships for that.