Maritime affairs generally refers to shipping (maritime affairs) and all maritime-related affairs, such as navigation, shipbuilding, ship inspection, maritime maritime law, handling of average accidents, etc.

Port and navigation engineering refers to the industries covering docks, dike slopes, revetments, yard roads, wharf slipways, shiplocks, underwater foundations and foundations, earthwork, artificial islands and platforms, coastal and offshore engineering, waterway regulation and drainage engineering, dredging and reclamation, underwater excavation and obstacle removal, underwater reef blasting and other engineering things.

The difference between the two is that maritime affairs mainly deal with maritime affairs, while port and shipping mainly deal with land and sea affairs such as docks.