This paper presents main results of the International Association Maritime Universities (IAMU) Project titled “COC course to revalidate competences by using simulators”. Use of simulation is considered relevant for maritime education and training, in accordance with Part A, Chapter I, Section I/11 of the STCW Code. Every master, officer and radio operator holding a certificate issued or recognized under any chapter of the Convention other than chapter VI, who is serving at sea or intends to return to sea after a period ashore, shall, in order to continue to qualify for seagoing service, be required, at intervals not exceeding five years, to establish continued professional competence. So the revalidation of certificates (if required) for continued professional competence shall be established, among others, successfully completing an approved training course or courses. The main objective of this contribution is to propose four complete revalidation courses (deck and marine engineer disciplines) using simulation technology to assessment, examination and certification of seafarers’ competence in accordance with the provisions of STCW Code for existing marines who need upgrade their professional maritime certificates.