To comply with MARPOL 73/78 Annex VI:a) Make necessary entry in Marine Fuel Sulphur record book.b) Obtain a copy of ‘Bunker Delivery Note’ (BDN) from bunker supplier which shall readily available for inspection at all time. The BDN shall be kept in the same file as Marine Fuel Sulphur Record Book. The BDN shall be kept onboard for a minimum period of 3 years.