Within 3 nautical miles of a coastline, which MARPOL discharge is allowed?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

Within 3 nautical miles of a coastline, which MARPOL discharge is allowed?

Discharges near the coast are tightly restricted, and only those that meet treatment standards are allowed. The only overboard discharge permitted within 3 nautical miles is gray water and oily water that has been treated so the oil content does not exceed 15 parts per million. Gray water comes from sinks, showers, and decks and is allowed when properly processed, while the oily portion must pass through an approved oily-water separator to keep oil below the 15 ppm limit. Oily waste by itself, solid wastes like dunnage, and sewage with pulped trash are not allowed in this near-shore zone, as they can pollute coastal waters. The 15 ppm limit reflects MARPOL’s requirement to minimize oil pollution from discharged effluent.

Discharges near the coast are tightly restricted, and only those that meet treatment standards are allowed. The only overboard discharge permitted within 3 nautical miles is gray water and oily water that has been treated so the oil content does not exceed 15 parts per million. Gray water comes from sinks, showers, and decks and is allowed when properly processed, while the oily portion must pass through an approved oily-water separator to keep oil below the 15 ppm limit.

Oily waste by itself, solid wastes like dunnage, and sewage with pulped trash are not allowed in this near-shore zone, as they can pollute coastal waters. The 15 ppm limit reflects MARPOL’s requirement to minimize oil pollution from discharged effluent.

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