They are regulated by regional professional boards with reciprocity. For example, the American Bureau of Shipping in North America. This concept is called a Cla

They are regulated by regional professional boards with reciprocity. For example, the American Bureau of Shipping in North America. This concept is called a Classification Society https://en.m.wikipedia.org/wiki/Ship_classification_society https://en.m.wikipedia.org/wiki/Ship_classification_society They are unlikely to skimp on this due to the insurance implications.