This publication provides guidance on proper and consistent completion of the Oil Record Book (Part II – Cargo/Ballast Operations) for oil tankers, as stipulated by Regulation 36 and Appendix III of Annex I of MARPOL 73/78. It sets out instructions and general requirements for making entries in the ORB Part II and lists the items that must be recorded. It also contains example entries for commonly used cargo/ballast operations.