Is it necessary to get into the navigation class in advance?

Generally, you can go to school for a physical examination after you arrive at school. As long as there is no serious eye problem, you will not be expelled from school. Also, you can use lasers to make eyes before school starts. It seems that the revision will be 4.8. When you graduate, companies will go to school to recruit some state-owned enterprises, such as China Shipping, COSCO, North-South Line, Inland Route and Port Authority. If you work in a port and don't go out to sea, you can go out to sea twice a year in some places like the Waterway Bureau. My classmate has a cool one at Nanhai College. If you are an undergraduate, you can also take an examination of civil servants and maritime safety administration. Anyway, you don't have to go to sea. Good luck.