To amend the Act commonly referred to as the "Johnson Act" to limit the authority of States to regulate gambling devices on vessels.

Amends the Johnson Act to provide that States may not regulate the possession or use of gambling equipment on vessels whose voyage consists of a segment: (1) that begins and ends in the same State; (2) that is part of a voyage to another State or to a foreign country; and (3) in which the vessel reaches the other State or foreign country within three days after leaving the State in which it begins.