You can add locators to points on the ocean and use them as constraints or connect them to other attributes. For example, you can add individual locators and constrain them to the oars of a boat so they are affected by the motion of the water independently of the boat.
Ocean surface locators follow the motion of the ocean in the Y direction only.
To add an ocean surface 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).
To add a dynamic locator
If you want to move the position of the locator interactively, turn on Free Transform in the options window. When on, the locator cannot be connected directly to the expression.