Marine Pollution Prevention and Environmental Protection
What this domain tests
MARPOL in operational detail plus the environmental mindset: discharge criteria, record books, special areas, SOPEP, garbage management, ballast water and the air pollution annex. The examiner tests numbers and conditions together - a discharge limit without its conditions scores poorly.
Core rules and concepts
- Annex I - oil. Machinery space bilge discharge only through the OWS with 15 ppm alarm and automatic stop, outside special areas (where stricter or zero limits apply), not from cargo areas, with the ship proceeding en route. Oil Record Book entries for every operation. SOPEP carried and drills held.
- Annex II - noxious liquid substances. Categorised substances, prewash requirements, cargo record book.
- Annex III - harmful substances in packaged form. Marking, labelling, documentation.
- Annex IV - sewage. Discharge of comminuted and disinfected sewage at a moderate rate when more than 3 nautical miles from land; untreated sewage beyond 12 nautical miles with the ship en route at not less than 4 knots. Approved treatment plants may have different allowances under flag/port rules.
- Annex V - garbage. Outside special areas, food waste comminuted may go at 3 nm, non-comminuted at 12 nm; plastics never. Special areas are stricter. Garbage Record Book and the garbage management plan.
- Annex VI - air. Sulphur cap under the current global limit with ECA limits lower; NOx Tier limits for engines; ozone-depleting substances record book; incinerator restrictions; fuel oil changeover and the log entry.
- Ballast Water Management Convention. Ballast Water Management Plan, record book, treatment standard D-2, and exchange standard where applicable.
Worked example
Asked whether food waste may be discharged 5 nm from the Croatian coast. Reasoning: the Mediterranean is a MARPOL special area for garbage; outside special area rules would permit comminuted food waste beyond 3 nm, but in the special area stricter rules apply and the safe answer is to retain and discharge ashore or comply with the special area conditions after confirming the national rule. The scoring answer identifies the special area and refuses to quote only the general limit without the special-area overlay.
Traps that cost marks
- Quoting 15 ppm without the OWS alarm/automatic stop and special area conditions.
- Confusing the 3 nm and 12 nm sewage figures, or the knots requirement.
- Saying plastics may be discharged when ground up - never.
- Forgetting the garbage record book entries for discharges and landings.
- Ignoring the Mediterranean and other special areas.