[ourmandave]

Do they have a boat version of this?

I get car sick easily but on open water I have to sit and watch the horizon or it's adios cookies.

[MBCook]

It is specifically for using your phone. So I don’t know if it would help.

I don’t think it’s actually driving specific, I think it just is based on the accelerometer. So it might work.

[cloverich]

It helps even if not actually using your phone, and for all kinds of motion.

(am highly succeptible to motion sickness, i generally have the feature on at all times).

[RandallBrown]

How does it help if you aren't using the phone?

[cloverich]

Getting sick from eg reading while driving is what it intends to protect. But you can use it without really using your phone, like staring at a blank screen, ie not "using" your phone in the typical sense. For people that get sick from motion more generally, as opposed to sick while reading and moving, which is far more common.