@mindsurferdev Your answer solved most of it, but now the boat hardly moves at all. (I clamped rather than removed the velocity.) I still need the boat to respond to the buoyancy of the water, but still ignore the movement of the player. Basically, it should respond to some hits, but not others. There must be a specific setting for that, but I don’t know which one it is. I’ve looked it up, but not found out what it is. This matches the real world: if I’m on a boat, the boat responds to the motion of the water (and a little to mine, but let’s ignore that for now), but I’ll be moving in relation to the boat. Me moving to the edge of the boat, will not make the boat move forward. But it won’t stop the boat’s motion in relation to the water either.