Familiar with and basic safety training certificate, proficient in survival craft and rescue boat training certificate, advanced fire training certificate and proficient in first aid training certificate. In the introduction of the mechanic industry, we can know that this industry belongs to the crew, so the four certificates of mechanics are the four certificates of crew, namely, the certificate of familiarity and basic safety training, the certificate of proficiency in lifeboat and rescue boat training, the certificate of advanced fire fighting training and the certificate of proficiency in first aid training. Mechanic is a position on the ship and belongs to the security crew.