Following sea
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A following sea is a boating term referring to tidal and wave direction in reference to your boats heading. If the current and waves of the body of water you are transversing are heading in the same direction you are, then the water is 'following' your boat. This is called a following sea.
The Far Side references this term in a cartoon which depicts a sea captain being followed through an alley by a giant wave, the caption of which says "Later that night, Captain McIntyre was killed by a following sea."