Q: Your examiner asks: "What does a Chief Mate < 3000 GT certificate permit, and what are the practical limitations compared to a Chief Mate Unlimited?"

Chief Mate < 3000 GT certificate (STCW Regulation II/2 — Chief Mate < 3000 GT): permits serving as Chief Mate on ships less than 3000 GT — this includes many coastal traders, short-sea vessels, offshore support vessels, large passenger ferries, and survey vessels. Limitations compared to Unlimited: (1) Cannot serve as Chief Mate on vessels of 3000 GT or above; (2) May be geographically unrestricted — depends on individual endorsement (CM 3000 GT may have near-coastal or unlimited geographic endorsement depending on training and flag state); (3) The competency standard assessed covers the same management-level functions as unlimited but with parameters appropriate to smaller vessel operations (e.g., cargo types, stability calculations, crew size); (4) The certificate holder can progress to CM Unlimited and Master Unlimited by completing additional sea service and passing further oral examinations. STCW Chapter II separates certification by vessel size and geographic scope: Regulation II/1 covers OOW on ships ≥500 GT; Regulation II/2 covers Chief Mate and Master; Regulation II/3 covers OOW, Chief Mate and Master on ships

Question 1

As Chief Mate, you are asked to oversee the entry of a rating into a cofferdam that has been sealed for 8 months. Describe the complete procedure from planning to safe exit.

Accepted Answer

Confined space entry procedure — sealed cofferdam: (1) Pre-entry planning: identify the space; review atmospheric hazards (oxygen depletion from corrosion, hydrogen sulphide from any trapped water, methane if near fuel spaces); issue a Permit to Work — Chief Mate authorises; (2) Ventilation: force-ventilate with an air blower for minimum 24 hours (for a sealed space — not a recirculating system); (3) Atmosphere testing BEFORE entry: test with a calibrated multi-gas detector for O2 (safe: 20.9%), LEL (safe: Enclosed space entry is one of the most important Chief Mate safety management competencies because it is a leading cause of seafarer fatalities at sea. The MAIB and MCA have investigated numerous fatalities in enclosed spaces — including cofferdams, ballast tanks, chain lockers, cargo holds, pump rooms, and void spaces. Oxygen depletion mechanism in a sealed cofferdam: steel corrodes, consuming oxygen from the trapped air. A sealed cofferdam for 8 months may have oxygen levels as low as 14-16% (normal is 20.9%) — at 16% O2 a person may become confused; at 14% lose consciousness; below 12% unconscious within seconds. H2S: if any trapped water and organic matter (seaweed, biological growth) is present, H2S may have accumulated. H2S is heavier than air and accumulates at the bottom — testing at the bottom of the space is essential. The standby rescuer rule: the standby rescuer must be equipped to enter the space and rescue the worker — wearing BA set ready to don. The most common scenario in fatalities: the worker collapses; a rescuer enters without BA to help; the rescuer also collapses; multiple fatalities result from one initial incident. This specific progression is documented in multiple MAIB investigation reports.

Question 2

Your examiner asks: "What does a Chief Mate < 3000 GT certificate permit, and what are the practical limitations compared to a Chief Mate Unlimited?"

Accepted Answer

Chief Mate < 3000 GT certificate (STCW Regulation II/2 — Chief Mate < 3000 GT): permits serving as Chief Mate on ships less than 3000 GT — this includes many coastal traders, short-sea vessels, offshore support vessels, large passenger ferries, and survey vessels. Limitations compared to Unlimited: (1) Cannot serve as Chief Mate on vessels of 3000 GT or above; (2) May be geographically unrestricted — depends on individual endorsement (CM 3000 GT may have near-coastal or unlimited geographic endorsement depending on training and flag state); (3) The competency standard assessed covers the same management-level functions as unlimited but with parameters appropriate to smaller vessel operations (e.g., cargo types, stability calculations, crew size); (4) The certificate holder can progress to CM Unlimited and Master Unlimited by completing additional sea service and passing further oral examinations. STCW Chapter II separates certification by vessel size and geographic scope: Regulation II/1 covers OOW on ships ≥500 GT; Regulation II/2 covers Chief Mate and Master; Regulation II/3 covers OOW, Chief Mate and Master on ships

Question 3

As Chief Mate on a 2,200 GT short-sea general cargo vessel, you are asked to plan a winter coastal passage from Aberdeen to Rotterdam. Your examiner asks how you approach the appraisal and planning stages.

Accepted Answer

SOLAS V Reg 34 Appraisal stage: gather: (1) Weather forecast — North Sea winter weather from Met Office and NAVTEX: likely depressions every 3-5 days, Force 8-9 common, sea state 5-7m in the northern North Sea; (2) Tidal information — tidal streams in the North Sea can reach 2-3 knots off headlands; factor into ETAs and berth windows; (3) Notices to Mariners — update charts; check for new wrecks, hazards, or Traffic Separation Schemes modifications; (4) Ship's condition — cargo distribution, stability at departure, GM, SF/BM; (5) Pilot/port information — check Rotterdam Waterway guidance, Maas approach, VTS; (6) NAVAREA warnings and current MSI broadcasts. Planning stage: (1) Lay off the track on charts — clearances from Humber, Dutch Frisian Islands, Traffic Separation Schemes; (2) Plan departure for fair weather window if possible; (3) Identify contingency ports (Bremerhaven, IJmuiden) if weather deteriorates; (4) Calculate distance, speed, ETA with weather routing consideration. SOLAS V Regulation 34 applies to all ships on all voyages — there is no exemption for coastal vessels or short-sea traders. The four-stage voyage planning process (Appraisal, Planning, Execution, Monitoring) is required at management level and the Chief Mate's role in the process is examined at CM level. North Sea winter conditions: this is a specific scenario that tests geographic knowledge — North Sea winter has a high frequency of Atlantic depressions, particularly October-February. Force 8-9 gale conditions are common for periods of 12-24 hours. A 2,200 GT coastal vessel in these conditions: heavy rolling, deck cargo risk, sea spray and structural stress. The passage from Aberdeen to Rotterdam involves passing through TSS schemes (Outer Hebrides, North Sea traffic separation). Contingency ports demonstrate planning for failure: if weather deteriorates mid-passage, the Chief Mate should have pre-identified ports of refuge and their approach conditions. CM level candidates must demonstrate awareness of the full SOLAS V/34 framework and apply it with geographic specificity.