The update of the crew's four certificates can be updated online, and can be viewed on the webpage or APP. During the epidemic, maritime colleges and universities could not start classes normally, so online training was set up, which is currently limited to the replacement training of small certificates, so it is now.

Generally, four small certificates are all three expired. According to the latest regulations, the four small certificates can be renewed within 1 year after their expiration. Some crew members did not renew their certificates in time after participating in the replacement.