The application number of crew certificate refers to the unique application number obtained by the crew when applying for the certificate. According to the relevant public information, the seaman's application number is an identification number obtained by seafarers when applying for seaman's certificate, which is numbered and recorded by the maritime department after receiving the seaman's application. Seafarers need to fill in relevant application forms and provide photos when submitting applications for seamen's certificates. According to these materials, the maritime department will review and verify the qualifications of the applicant and the required documents. The application number of seaman's certificate is very important in the process of handling seaman's certificate. The applicant can check the application progress, approval results and other related information through this number.