Not sure what sort of repeated exposure you are referring to.
Didn’t realize I had a problem. Had done OK growing up as a kid in small boats on lakes with minimal wave action.
However, when I went out with an organization President & friends for a day of sea fishing—the waves were going every which way on all axes. I was all heaved out and lay moaning on the bottom of the boat for 8 hours. They were not about to cut short their fishing for my problems.
I had taken anti nausea/motion sickness meds beforehand. Was absolutely of no use.
SLIDE ALERT:
Not sure what sort of repeated exposure you are referring to.::
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What I meant was the brain can eventually process the movement of the vessel, so that the person will stop becoming seasick.
It is my understanding that motion sickness results because the brain cannot process the feeling of motion while sensing that the person is standing or sitting in one place. In your example, repeated trips on that fishing vessel would find you becoming less and less disoriented.
BTW, I have read that the worst place to be with seasickness is below decks.