This is necessary for authorities to be able to monitor if a vessel's crew has properly disposed of their oil discharges at sea.
[3] In every entry the chief engineer must record tank number, location, type of oil, description of operation, and quantity.
According with revised MEPC.1/Circ736/Rev.2, issued 6 October 2011, additional amendments to oil record book entries have been implemented by IMO.
The first part of the oil record book deals with machinery space operations for all ships.
Marine electronic oil record books must meet the specific reporting requirements of IMO, SOLAS and flag states.