What is a preferred mortgage?

A preferred mortgage is a mortgage which is given status as a maritime lien. As such it enjoys a certain priority in the event of default. In addition, the Coast Guard is prohibited from making certain changes in documentation including, but not limited to, change of vessel ownership, name, and hailing port without consent of the mortgagee. For this reason many financial institutions require vessels which are eligible for documentation to be documented and to have preferred mortgages recorded against them.
what is a preferred mortgage