A Michigan boat bill of sale is a document that records the transaction of a watercraft between two parties. A Michigan boat bill of sale records a transaction involving the purchase of a motorboat, sailboat, canoe, or other vessel.I. sold the following (check one): Printed Name. If you're purchasing or selling a boat in Michigan, use a MI Boat Bill of Sale to prove a transfer of ownership has taken place. The Michigan boat bill of sale form is a document that reports the key elements regarding the sale of a boat for a sum of money. A Michigan boat bill of sale is a document proving that selling or buying a watercraft has taken place in the state. The Michigan Boat Bill of Sale form is a legal document that records the transfer of ownership of a boat from the seller to the buyer. Explore our Michigan bill of sale templates and learn how to create your legally binding document that protects your interests. The form must be signed and can also be notarized for further validity. Registration. Recreational vehicles and watercraft must be registered in Michigan, unless exempted.