Joe, an old survey is worthless
And so is a seller's survey. When you hire a surveyor, that surveyor represents YOU, and YOUR interests...so you want the best one you can find. You have no way of knowing how well qualified a previous surveyor was...what he might have missed, or what may have been an insigificant problem at the time of the old survey that the seller should have corrected but didn't...and now has progressed to a serious problem that you won't find because you don't know what to look for.Your lender/insurance company will require at least a current "C&V" (condition & value) survey anyway, which isn't a thorough as a full pre-purchase survey, but costs about half as much. Bite the bullet and get the full one. All used boats have a few problems...they may be minor, but minor problems can turn into major ones if not found and corrected...and 99% of the time, the cost of correcting 'em all is more than the price of the survey. When problems are found during a pre-purchase survey, the buyer has two options: renegotiate the price downward enough to cover the cost of correcting 'em, or require the seller to fix 'em *to your surveyor's satisfaction.* I recommend the latter...just in case it turns out that there was more to the problem than could be seen till it was removed or taken apart for repairs (i.e. rot in the floor under a leaky toilet that hadn't spread far enough to notice till the toilet was removed...turning what you thought would only be $150 for a new toilet into a $500+ repair AND a new toilet!!)Hire the best surveyor you can find, and make any offer 'subject to survey.' It'll be the best investment you can make. And btw, be there during the survey...a good surveyor will want to show you everything, good AND bad... what you'll want to keep an eye on "just in case"...what's especially good, and what isn't that--while it isn't exactly a problem--you might consider changing.