Gewährleistung is the statutory warranty under German law. YACHT's contract guide says it runs two years from handover. A private seller can exclude it, but only in writing in the contract. A dealer can cut it to one year on a used boat, can't exclude it entirely, and carries the burden of proof for the first 12 months.
What a surveyor checks
Nothing on the boat, but it changes what the survey is worth. Most private sales exclude the warranty, so YACHT advises bringing an expert or commissioning a full survey before signing: defects found afterwards are the buyer's.
In the report
"Purchase is a private sale with the statutory warranty excluded in the draft contract. Findings below should be priced before signing."