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I don't think the ship maneuvers at all. Both the ship and rocket are pre-programmed with the landing coordinates, and independently arrange to be at the right spot at the right time. The ship has fancy thrusters, but their purpose is to hold it perfectly still even when the water is moving around a lot.

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The ship is also painted with a radar reflective X that the booster is targeting on the way down. The ship just has massive engines for solid station keeping in rough seas. Like you say they don't use those to move to the booster.

I'm fairly sure it's these things: https://www.thrustmaster.net/out-drive-propulsion-unit/

They were posted about when the ships were first made. And I know spacex had gone a size up from the originals.

Totally what that guy on Gold Rush needs to get his barge up the Yukon. ;)

That's my understanding as well. The ship moves really slow by comparison to the rocket, not much useful moving it can do - it just stays in place despite waves and weather.

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