Donal wrote:
Seasickness is 50% physical and 50% in the mind. It is triggered by
confusion between the signals from the eyes and ears(balance).
Snip

The treatment for the "in the mind" side is also quite simple. Look
at the horizon .... this will synchronise the signals from the eyes and
ears. On a sailboat, this is easy. However, on a cruise ship this
will be a bit more difficult. If it is at all rough, then you should
stay on the upper decks where you can look at the horizon if your
?stomach begins to feel a bit funny. After the first 24 hours the
problem is likely to dissappear.

When I got seasick the first time I was working on a small (303')
top-heavy ship for NOAA going across the Atlantic. I found that after
about 6 or 7 days of misery that if I was below decks I could just
defocus my eyes when going down a passageway - just sort of look at
nothing, and the sickness would go away. After awhile of doing that it
became habit and never got seasick again.