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Fluid Effects > Ocean > Add Boat Locator |
Boat locators follow the motion of the ocean in the Y direction, but additionally rotate in X and Z to allow the boat to pitch and roll in the waves.
Fluid Effects > Ocean > Add Boat 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.