When hovering above the ocean, the windshield of the helicopter will blur to simulate water spray fogging the windshield. When reducing hieght to 0m above ocean, the blur will clear.
Seems to be a trigger guessing when the chopper is on the ground, but it is negating the factor of the type of terrain or surface the helicopter is on. As such, the trigger assumes the chopper has landed at 0m, but doesn't take into account for the type of surface or terrain.