Ships which have rechargeable systems that contain ozone depleting substances must maintain an Ozone Depleting Substances Record Book under the revised MARPOL Annex VI, reg. 12. 6.
This Record Book may form part of an existing log-book or electronic recording system as approved by the flag State Administration. Reg. 12. 7 requires that entries are made in respect of ozone depleting substances when specific actions are carried out such as supply, charge and discharge of the system, or repair and maintenance.