Cruise ship means a passenger vessel over 100 gross tons, carrying more than 12 passengers for hire, making a voyage lasting more than 24 hours any part of which is on the high seas, and for which passengers are embarked or disembarked in the United States or its territories. This definition covers passenger vessels that must comply with 33 CFR parts 120 and 128.
33 C.F.R. §165.835