An Affidavit of Witness for the Sale of a Boat is a legal document in which an individual who has observed the sale of a boat provides a sworn written statement attesting to the details of the transaction. This affidavit serves as a formal and legally binding account of the events surrounding the boat sale. 
 
The purpose of the affidavit is to provide an independent and credible record of the transaction, which can be used as evidence in legal proceedings, disputes, or to establish the legality of the sale.