You have been offered a cargo of Category Y noxious liquid substance (NLS) for a coastal voyage. What certification and operational requirements apply to your vessel?

A. MARPOL Annex II — NLS carriage requirements: MARPOL Annex II regulates the carriage and discharge of noxious liquid substances in bulk (chemicals). Categories: X (most hazardous — major hazard), Y (hazardous — minor hazard), Z (minor hazard), OS (other substances — insufficient data). For Category Y NLS: (1) VESSEL CERTIFICATION: the vessel must hold an NLS Certificate (for ships carrying NLS other than oil) or a Certificate of Fitness (for chemical tankers — IBC Code); a standard coastal cargo vessel does NOT automatically have this certification — it must be obtained from the flag state before carrying NLS; (2) IBC CODE: for bulk liquid chemical carriage, the International Code for the Construction and Equipment of Ships Carrying Dangerous Chemicals in Bulk (IBC Code) applies. Chemical tankers are built to IBC Code standards with segregated tanks, vapour systems, and specific materials requirements; (3) DISCHARGE: Category Y NLS may only be discharged to approved port reception facilities; discharge overboard is subject to strict conditions (concentration, distance, water depth); (4) CREW TRAINING: STCW requires officers on chemical tankers to hold the STCW "Advanced Training — Chemical Tanker" certificate (Table A-V/1-2); (5) PRACTICAL ADVICE: a standard 450 GT near-coastal cargo vessel is NOT certified to carry NLS in bulk. Refuse the cargo unless the vessel is certified and the crew are trained.

B. Any vessel can carry Category Y NLS provided the cargo is in sealed drums or containers. The NLS restrictions only apply to bulk liquid carriage.

C. Category Y NLS is moderately hazardous and can be carried in any cargo hold of a general cargo vessel without special certification.

D. MARPOL Annex II only applies to international voyages. For a coastal voyage within UK waters, NLS can be carried by any vessel with a valid loadline certificate.

A. MARPOL Annex I bilge water discharge — small vessel rules: MARPOL Annex I Regulation 15 covers machinery space bilge water. For vessels of 400 GT and above: bilge water may be discharged overboard only if: (a) outside Special Areas; (b) more than 12nm from the nearest land; (c) vessel is en route (not at anchor or in port); (d) oil content does not exceed 15 ppm (monitored by approved OCM); (e) Oil Record Book entry made. For vessels BETWEEN 400 GT and 400 GT (your vessel at 350 GT): MARPOL Annex I Regulation 15.2 applies a different regime — vessels of less than 400 GT must retain oil residues and bilge water on board or deliver to port reception facilities. There is no 15 ppm discharge provision for vessels under 400 GT outside special areas. PRACTICAL IMPLICATION: your 350 GT vessel CANNOT legally discharge bilge water overboard at 8nm. Options: (a) Pump to the bilge holding tank; (b) Continue to port and discharge to reception facilities; (c) If flooding emergency — it may be necessary, but this is a distress provision only.

B. Any vessel can discharge bilge water beyond 3nm from shore. MARPOL only applies to vessels over 1000 GT.

C. Discharge is permitted at 8nm as long as the bilge water is mixed with sea water to reduce the oil content below 50 ppm.

D. MARPOL does not apply within territorial waters (12nm). Beyond 12nm, all bilge water discharge by any vessel is unrestricted.

A. MARPOL Annex V (as amended 2013) — garbage discharge: (a) FOOD WASTE: may be discharged in territorial sea (>3nm from nearest land) or in special areas (>12nm from nearest land) only when comminuted or ground (passed through 25mm mesh) and the vessel is en route. Outside special areas and >12nm from land: food waste may be discharged without comminution provided it does not create a floating debris hazard; (b) PLASTIC — ALL FORMS: completely prohibited for overboard discharge in all ocean areas. This includes synthetic fishing nets, plastic bags, plastic packaging of any kind. No minimum distance applies — plastic NEVER goes overboard; (c) PAPER, RAGS, GLASS, METAL, CROCKERY: prohibited within 12nm from nearest land; permitted (outside special areas) beyond 12nm from land. IN THIS SCENARIO: food scraps at 15nm — permitted with caution (outside special area, >12nm, en route). Plastic — ABSOLUTELY PROHIBITED at any distance. Paper — permitted at 15nm in non-special areas. A Garbage Management Plan (for vessels 100 GT+) must be carried and followed.

B. Food scraps and paper can always be discharged more than 3nm offshore. Plastics can only be discharged if they are biodegradable.

C. MARPOL Annex V only applies to commercial vessels over 5000 GT. Small near-coastal vessels are exempt from all garbage regulations.

D. All waste can be discharged at more than 12nm offshore — this is the MARPOL Annex V general limit for all waste types.