 This is necessary in order for authorities to be able to monitor if a vessel's crew has performed any illegal oil discharges at sea.When making entries in the oil record book Part I, the date, operational code, and item number are inserted in the appropriate columns and the required particulars shall be recorded in chronological order as they have been executed on board.Each operation is to be fully recorded without delay so that all the entries in the book appropriate to that operation are completed.