Re: Medicine at Sea advice
Default to the good Doctor above, of course, but I'd add "dealing with a concussion" to his list. That swinging boom in an accidental gybe is a real fear, and dealing with the aftermath is something every sailor should be prepared for.
On a side note, I think any discussion of "emergencies @ sea" should also include a conversation about preparing everyone on board for what to do "next". I wonder how many at-sea-rescues take place because the non-injured parties aboard aren't capable of handling the vessel after the captain gets injured?