1. Confirmation of authenticity and responsibility: The signature of the holder is to confirm that the information displayed in the Crew Health Certificate is true and accurate. The signature indicates that the holder voluntarily provides his own information, and confirms the authenticity and accuracy of the information provided in the Crew Health Certificate. At the same time, the signature also shows that the holder is willing to bear the relevant responsibilities.

2. Legal and management requirements: Signature is a part of legal and management requirements. In many countries, the seafarers' health certificate is a necessary navigation document to verify the medical and health status of seafarers. The government or regulatory agency requires the holder to sign, so as to ensure compliance with the law and use it for relevant administrative management.