User Guide > Dynamics and Effects > Fluid Effects > Fluid Effects Menus > Fluid Effects > Fluid Effects > Ocean >
Fluid Effects > Ocean
> Float Selected Objects
You can make an object float by adding a dynamic locator to it. Dynamic locators follow the motion of the ocean in the Y direction and also react to dynamic attributes such as buoyancy, gravity, and damping.
Fluid Effects > Ocean
> Float Selected Objects > 
If you want to move the position of the object interactively, the object cannot be connected directly to the expression. In this case, turn on Free Transform.