Quote Originally Posted by Iscah View Post
The boat might not even be "moving" but remaining static while the background is moved past it, if that gives a smoother effect.
This. There's at least one instance with actual moving platforms, and that's in Copperbell Mines. When you ride the lifts, you can see other players rapidly jittering up and down because the game's movement code can't keep them in sync with the platform. I can't immediately remember any instances of platforms which move sideways.