This Decree-Law provides for registration, classification and exams of vessel crew. It consists of 7 Chapters specifying the requirements to be satisfied by vessel crew in order to perform maritime professional activity. This Regulation is divided as follows: General definition and aims (chap. 1); Maritime registration (chap. 2); Seaman's book (chap. 3); Crew classification (chap. 4); Functions (chap. 5); Sanctions and penalties (chap. 6); Final provisions (chap. 7).