Wookie
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Yes. If you look at pictures of a lift from a boat, you see that the bird is running the same course as the boat, at about a 45 degree angle to the boats head, so the pilot can look out their window and see the bow or an antenna or otherwise a point of reference to the boat. They do not look around, they keep their eye on the reference and fly keeping the reference at the same range and bearing to the helo.Wookie is correct. If possible, you want about 20 knots of airspeed. At that stage, rotor will leave dirty air behind and become a lot more efficient. It's called effective translational lift. Side benefit is that it is easier to maintain steady position/heading for both helicopter and the boat.
Pilot does not care if the boat is moving or not, you can not use water as reference for position holding, so you just hold yourself relative to the boat.
The pilot will give very clear instructions to the captain, and ensure that the captain understands them before attempting to hoist. As in, maintain course, bearing, and speed, lower antennas, stow any loose gear. They have hoist operators to run the hoist and a right hand seat to make sure they don’t run into an oilrig.