Reacher, I disagree with the definition of "as-is" you found. Here's the Black's Law Dictionary:
"In the existing condition without modification. Under UCC 2-316, a seller can disclaim all implied warranties by stating the goods are being sold 'as-is' or 'with all faults.' Generally, a sale of property 'as-is' means that the property is sold in its existing condition, and the use of the phrase as is relieves the seller from liability for defects in that condition." Implied warranties are that the boat would be good for its ordinary purpose (ie, "does this thing float and sail?") and that it would be good for a particular purpose (ie, "will this thing be good for the Everglades Challenge?").
All said, I would be comfortable with only "as is" and recommending that buyer can get a survey. I would not want to prepare a list of defects--do that, and if you miss one you face allegations of concealing a known defect when otherwise you were making promises about the fitness of the boat. That's not a good position.
Edit: sorry if this is a little intense, I care about legal definitions like some of you care about fenders hanging off the side while under sail