The ONLY thing I've found that is really helpful is limiting head
movements, especially pitching movements. If I'm in the back of a
twin on a long flight with a student and start to get motion sick I
will fix my head on the headrest and only use my eyeballs to look
around. Of course I'm watching to be sure the student is keeping a
good look out. By reducing the equilibrial stimulation this way one
can greatly extend the time before motion sickness gets going in
ernest. Student gets more stick time, non flying pilot gets less SICK
time. Also a lifesaver with passengers who admit to feeling queasy.
I think this is where the "fix your eyes on the horizon" advice came
from. That doesn't do squat but avoiding looking up and down
(pitching) makes a big difference. This is why people often get sick
faster if they are taking photos. They are looking all over the place
and often through a viewfinder that exaggerates the apparent visual
motion. I've done extensive research on motion sickness with various
test subjects on our centrifuge in the back yard (playground merry-go-
round). I promise you can endure longer if you sit and keep your head
still then if you move around.

MM