I've only ever been sea-sick once. not a nice experience and the sea were calm? just large swell so a slow but steady up and down with no rocking or bumping set me off I guess. to date the biggest sea's I've sailed in were over 30 feet and full of 8-10 foot waves and the odd 30-foot breaker. Shit can go wrong in storms like that! I had a breakdown off of Haiti and had to put in there for a couple days. Make for a great blog some day. :-)