I am a college student studying navigation technology. I would like to ask how to get on those cruise ships, merchant ships and other ships with seafarers' certificates after graduation.

A cruise ship is a special purpose ship. You have to get a special certificate, a passenger ship certificate or a passenger rolling certificate and three certificates of competency after training, so that you can get three certificates of internship. If you change three certificates, you can go directly to the passenger ship to be the third certificate (if people want you). If you want to be the third mate on the cargo ship, you need to practice for another year ~! ! !