Jumping off a ferry is a serious offense and will be punishable to the highest extent as per USC Code 2302(a)
“Interfering with the safe operation of a vessel, so as to endanger the life, limb or property of a person is a violation of the Coast Guard Authorization Act of 1998 46 USC 2302(a).
Examples of such interference include instances where a passenger intentionally jumps off a commercial vessel that is not intended to support water activities. This practice, coined “rail jumping” in the marine industry, often diverts crew member attention away from the safe operation of the vessel in order to respond to a man overboard situation. Additionally, this includes unruly behavior while onboard resulting in the disruption of safety to those onboard. Under USC Code, this is a Class 1 Civil Penalty and is punishable up to $30,000.”