May I add to this?
You can equate pleasure craft sales to what is seen when there are used car sales between private parties. You can equate it to the kind of evidence a buyer requests from a seller. That could be maintenance records, the age of the vessel—obviously—or how the vessel was used. If you're looking at smaller vessels, you can equate it to this type of transaction between private individuals.
Obviously, if it's commercial craft, you would be looking for something more extensive.
Joanne.