Im not convinced by this test, you can focus on a horizon. Most times we get Ik is below deck where the whole room is in unison with your head. The old boys used laps to create an artificial horizon, you could focus on the light on the wall as the lamp swung. Flourescent lights and incandeseants used in more modern ships took the magic light away. If you get sick now they tell you to go outside and pick a point on the horizen and focus on it. Two things that really got me were galley cooking smells and deisal or a mixture of both. Orange zest weirdly instantly cleared my head, just used to peel an orange, never ate it. The time i suffered the most was heading out of port, hitting the swell just outside the ports breakwater. Especially on rough transits, on one occasion we went out in a force 5. Moby, liferafts - you are spot on. The navy would get us to do the drills then when we were all inside would tow the liferaft around to simulate being in sea conditions. once one person is sick all 25 jioned in. Quells the anti sickness medication ended up being banned for causing mental and anger issues. Similar to malerone for links to gulf war syndrome. I have no idea what i was injected with over the years - ive probably had a vaccine for covid already back in the 90's.