Marine transportation is carried out by means of natural waterways, not restricted by roads and tracks, and has stronger passability. With the change of political, economic and trade environment and natural conditions, it can adjust and change the route to complete the transportation task at any time.
With the development of international shipping industry, modern shipbuilding technology is becoming more and more sophisticated, and ships are becoming larger and larger. The number of supertankers has reached more than 600,000 tons, and the capacity of fifth-generation container ships has exceeded 5,000 teU.