Here's one I haven't seen yet on the thread---Quease-ease, a combination of ginger, peppermint, spearmint and lavender oils, inhaled by a 'sniffer' about the size of a lipstick tube. I've not needed anything yet myself, but sailing with plenty of kids and newbies last season, this product was almost always effective. Re-usable and only used only after onset of symptoms. Developed by an RN, I think for chemo patients or morning sickness sufferers.
You can see their website at soothing-scents dot com