It seems like the only likely scenario for someone going to jail, would be if the captain never gave orders to the crew to do a roving watch. If he did and the crew member purposely and knowingly disobeyed those orders and abandoned his post and went to bed, that crew member may end up in jail. Other than those two scenarios, this will be a civil litigation case only. That’s just my opinion. The above is only speculation on my part and not intended to be interpreted as facts.