Eherlihy- Thanks for the response, I do have a background - 18 years in prehospital and emergency medicine.
Frog - I would be very interested in the details, I know of zero cases of actual cardiac arrest except as I noted above where CPR without ALS lead to a successful recovery of the victim. What isn't taught in basic CPR classes is that lack of a peripheral pulse/spontaneous respiration does not always indicate cardiac arrest. Perhaps this is one of those cases. I don't mean to give the impression that trying isn't worthwhile, but it is a risk/reward situation with a very very low probablility of reward unless you can reach advanced life support within 30 mins. The reality of which is even 2 miles off the coast in a sailboat....that isn't going to happen.
SD - Thank goodness, I finally get to respectfully disagree with you on something, I was afraid for my sanity.

An AED is useful in the house yes, in the marina possibly, but once out of the harbor, again...you have a $2-5000 investment in an item that has, for all practical purposes, zero chance of success. If money is no object, sure, get one. If not, spend the money on boom preventors, life jackets, lifelines...etc. Much better return on investment.
Art - I didn't mean to hijack your thread, sorry

I hope I can be forgiven. Your right, nice teaching tool. It just struck a nerve with me.
Michael
p.s. These are my opinions, if you aren't 100% satisfied, please don't hesitate to ask for a full refund.