Marine Engineer, Army training combined with State university of NY, mostly online or at remote Army education centers. Plus lots of self study and testing, couple marine classes, ship board firefighting etc.
Marine transportation industry is BOOOMING !, deck and engine, yet I never see it listed in any of the job opportunity articles in the news. Tugboat and shipping companies are screaming for qualified people. Especially Engineering. Coast guard laws have changed and boats getting away with licensed and underliscensed people are getting cracked down on.