As required by Reg.31 of Annex 1 of Marpol the ODMCS should be provided with a recording device for recording the discharge in litres per nautical mile and total quantity discharged. This discharge should be kept onboard at least for a period of

Answer & Explanation

The correct answer is Option D: Continuous, 3 years **Correct answer : Continuous, 3 years**.

MARPOL Annex I, Regulation 31 requires the Oil Discharge Monitoring and Control System (ODMCS) to have a recording device to track discharges. These records must be preserved for at least three years to be available for inspection by Port State Control or Flag State authorities.