There are no restrictions on the nationality for crew on Seychelles flag vessels. There is a minimum of three certified deck officers (Master, Chief Officers and second officer) for vessels over 1600 Gross Registered tonnes. There is no mandatory minimum of ratings required for vessels over 3000KW, a minimum of these certified engineers is required (Chief engineer, second engineer and assistant engineer. Officers who hold certificates issued by the Republic of Seychelles or any Commonwealth country or certificates issued by a country, signatory to IMO and certified under the ambit of the STCW convention may be acceptable. Rating should have at least one year of sea-service or must have completed an approved basic safety course, plus six months of sea-service. Officers serving on tankers who do not have six months precious services on such type of vessel or hold appropriate endorsement must take a basic tanker safety course.