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Fluid Effects > Ocean > Add Dynamic Locator |
Dynamic locators follow the motion of the ocean in the Y direction, but additionally react appropriately to dynamic attributes (in the Extra Attributes section of the Attribute Editor).
Fluid Effects > Ocean > Add Dynamic Locator > 
If you want to move the position of the locator interactively, the locator cannot be connected directly to the expression. In this case, turn on Free Transform.