Vessel Modification Act of 1991

Vessel Modification Act of 1991 - Amends the Merchant Marine Act, 1920 to replace provisions prohibiting coastwise shipping by a vessel rebuilt outside the United States with provisions prohibiting coastwise trade by a vessel if any repair, alteration, improvement, modernization, or other change is performed outside the United States, except for minimum emergency repairs sufficient to travel to a U.S. point for additional repairs.