The Flaggenzertifikat is issued by the BSH, Germany's maritime agency, for seagoing yachts up to 15 m. YACHT says it's valid for eight years and isn't proof of ownership. Boats over 15 m hull length must instead be entered in the Seeschiffsregister.
What a surveyor checks
The certificate's number and expiry. On inland waters its number, with F added, can serve as the boat's identification number. Ownership comes from the Internationaler Bootsschein, a register entry or the purchase contract.
In the report
"Flaggenzertifikat issued by the BSH, in date. Not proof of ownership; title rests on the purchase contracts provided."