Oral Exam Prep

SV Engineer Officer of the Watch — Oral Exam Preparation

SV-EOOW-ORALS

Modules
4
Lessons
28
Questions
140

Independent study. xplor is not an accredited training provider and awards no certificate or Certificate of Competency. The SV EOOW CoC also requires the MCA-approved Small Vessel education and training programme, the MCA Small Vessel competency examinations, qualifying sea service with a completed Training Record Book, and an oral examination conducted by an MCA examiner. AI-drafted content pending subject-matter-expert review.

Drafted from MSN 1904 (M+F) (published 21 December 2022); MIN 642 (M+F) (published 19 December 2022, updated 9 June 2025); the MCA Small Vessel EOOW oral examination syllabus (published 11 June 2018); STCW Code sections A-VIII/1 and A-VIII/2 and Table A-III/1; the Code of Safe Working Practices for Merchant Seafarers 2026 edition (MIN 688 (M) Amendments 4 and 5); MGN 659 (M+F) Amendment 3 (6 January 2026) on the Entry into Enclosed Spaces Regulations 2022 (SI 2022/96); the Merchant Shipping (Prevention of Oil Pollution) Regulations 2019 (SI 2019/42), (Prevention of Pollution by Garbage from Ships) Regulations 2020 (SI 2020/621) and (Prevention of Air Pollution from Ships) Regulations 2008 (SI 2008/2924); MARPOL Annexes I, IV, V and VI including resolution MEPC.251(66) and the Mediterranean SOx ECA in force 1 May 2025 (IMO; Lloyd's Register Class News 05/25); BSH's summary of MARPOL Annex I discharge rules; FSS Code chapter 5 as amended by MSC.206(81); IACS Unified Requirements M9 and M10; SOLAS V/26 and II-1/29 (secondary summary); the ISM Code; and the Red Ensign Group Yacht Code Part A, July 2024 edition..

Rule notes (12)
  1. Recent change

    OneOcean harassment module for all UK CoC holders by 31 March 2027

    MGN 718 requires everyone holding a UK CoC or CoP, and anyone whose PSSR certificate is dated before 1 January 2026, to complete OneOcean module 0900 by 31 March 2027. It reverses MIN 729 (December 2025), which had said existing PSSR holders needed nothing more. The module is free, online, takes about one hour and gives a digital Verification of Training. Do it now: missing it may hold up your next revalidation.

    Sources

  2. Sources disagree

    PSC&RB and AFF refreshers for OOW (Yachts): the notices disagree

    MSN 1865 Amendment 1 Annex A lists only PST and FPFF refreshers for the OOW (Yachts) <3000 GT CoC. MSN 1858 Amendment 2 section 6 lists PSC&RB for that CoC with five-yearly updating, and MSN 1861 Amendment 1 lists PSC&RB and AFF refreshers for every revalidation. Updating PSC&RB also means updating PST, and AFF means FPFF. Until the MCA settles it, keep PSC&RB in date.

  3. Not confirmed

    MIN 643 short-course rules expire on 30 September 2026

    MIN 643 sets which foreign short-course certificates the MCA accepts and which courses may be taught online. The December 2022 edition carries an expiry of 30 September 2026 and no replacement had been confirmed. Under it, PST, FPFF, PSC&RB and FRB refreshers cannot be done online or peripatetically. Check gov.uk for the successor before booking a course abroad.

  4. Not confirmed

    Y-ticket conversions rest on MIN 642, which expired on 1 December 2025

    MIN 642 sets the routes from Y1–Y4 yacht engineer CoCs to Small Vessel CoCs. Its gov.uk note says it was extended to 1 December 2025; on 26 September 2026 it was still listed, not withdrawn and not replaced. It also cites the Chief Engineer <3000 kW oral as STCW III/2 where MSN 1904 says III/3. An MCA-approved college says Y-tickets can still be revalidated every five years, so conversion is optional for yacht work. Confirm the route with the MCA before paying for modules.

    Sources

  5. Recent change

    Old ML5 form accepted only until 31 December 2026

    The ML5 form MSF 4112 Rev 02/23 is accepted for new referrals only up to and including 31 December 2026; use Rev 01/26 after that. Certificates already issued on the old form stay valid until expiry. A commercial endorsement needs an ML5 or an ENG1.

    Sources

  6. Sources disagree

    GOC or ROC for Chief Mate and Master (Yachts)?

    As printed, the ancillary table in MSN 1858 Amendment 2 marks both GOC and ROC against the Chief Mate and Master (Yachts) columns. The ROC will not satisfy the OOW (Yachts) route. Hold a GOC for any yacht deck CoC until the MCA says otherwise.

  7. Recent change

    Sport or Pleasure Vessel Code replaced MGN 280 on 12 December 2025

    The Sport or Pleasure Vessel Code applies from 12 December 2025 and replaces the Yellow, Blue and Red Codes, MGN 280 for sport or pleasure vessels and the Intended Pleasure Vessels code, with a transition for existing vessels. The Master (Code Vessels <200 GT) oral syllabus still names MGN 280 and LY3, so know both old and new references.

  8. Recent change

    GMDSS certificates now issued by the MCA directly

    Since 12 May 2025 the MCA approves GMDSS courses and issues certificates itself, on form MSF 4354. Exams are run by the training centre with a separate trainer and assessor, and a failed candidate may be allowed one resit within 2 weeks. The fees in MIN 716 (£77 issue, £54 standalone revalidation) come from a notice that expired on 31 May 2026; check current fees.

  9. Recent change

    EPIRB and PLB registration is now mandatory on UK vessels

    MGN 665 Amendment 1 (24 March 2026) makes registration of EPIRBs and 406 MHz PLBs on UK ships and watercraft mandatory, and failing to register is an offence. Check the yacht's beacons and any crew PLBs are registered with the UK Beacon Registry and the details are current.

  10. Not confirmed

    MSN 1858 Amendment 2 cites notice amendments not yet published

    MSN 1858 Amendment 2 refers to MSN 1865, MSN 1862 and MSN 1864 Amendment 2, but gov.uk showed only Amendment 1 of each when checked. xplor courses follow Amendment 1. If a later amendment appears, its requirements override what is taught here.

  11. Recent change

    Accident reporting: new UK Regulations from 15 May 2026

    The Merchant Shipping (Accident Reporting and Investigation) Regulations 2026 (SI 2026/430) came into force on 15 May 2026 and revoke the 2012 Regulations. Serious injury means incapacitation for more than 72 hours starting within seven days. Evidence, including VDR data, must be preserved, normally for 30 days after notification.

  12. Recent change

    Mediterranean SOx ECA: 0.10% sulphur fuel since 1 May 2025

    The Mediterranean became a SOx Emission Control Area on 1 May 2025, with a fuel sulphur limit of 0.10% m/m. Engineers bunkering or changing over fuel for Mediterranean passages must plan to that limit.

    Sources

SV-EOOW-ORALS-M1 · Marine engineering at the operational level

10 lessons

SV-EOOW-ORALS-M1-A Keeping the engineering watch and operating the main and auxiliary plant: diesels, fuel, lubrication, cooling, propulsion, steering, pumping and refrigeration.

In preparation
SV-EOOW-ORALS-L1.1Taking over, keeping and handing over the engineering watchThe examiner opens with the watch because it shows how you think. **Structure first: orders, work in progress, tanks, machinery state, then the walk-round.**PreviewSV-EOOW-ORALS-L1.2Preparing machinery for sea, stopping and testingDeparture is where most engine room surprises start. **Show a sequence, show the checks, and show that you speak to the bridge before anything turns.**LockedSV-EOOW-ORALS-L1.3Main propulsion diesels and starting systemsThe syllabus names both compressed air and battery starting. **Know how your engine starts, why it might not, and the explosion risks in the air system.**LockedSV-EOOW-ORALS-L1.4Fuel oil system and purifiersFuel is where fire, pollution and engine failure meet. **Trace the system from bunker tank to injector and explain what the purifier actually does.**LockedSV-EOOW-ORALS-L1.5Lubricating oil and crankcase explosionsOil keeps the engine alive and, in the wrong state, can blow the crankcase doors off. **Know the circuit, the warning signs, and exactly what not to do after a hot-bearing alarm.**LockedSV-EOOW-ORALS-L1.6Cooling water and charge air systemsOverheating ends more yacht passages than anything dramatic. **Know both circuits, the wet exhaust, and what a high-temperature alarm is telling you.**LockedSV-EOOW-ORALS-L1.7Propulsion, steering gear and back-up arrangementsThe syllabus asks for propulsion and steering gear **and their back-up arrangements**. **Be ready to walk the examiner from the engine to the propeller and from the wheel to the rudder, then do it again with a failure.**LockedSV-EOOW-ORALS-L1.8Routine pumping: fuel, fresh water, bilge and ballastMost pollution and flooding incidents begin with a valve in the wrong position. **Plan the transfer, sound before and after, and know the emergency bilge suction by heart.**LockedSV-EOOW-ORALS-L1.9Fault finding: pumps, machinery, alarms and tripsThe syllabus asks you to locate and rectify common faults. **The examiner is testing method: what changed, what the local gauge says, and what you isolate first.**LockedSV-EOOW-ORALS-L1.10Refrigeration and HVACProvisions, guest comfort and a refrigerant leak in a small plant room all land on the watchkeeper. **Draw the cycle, read the sight glass, and treat a leak as an enclosed space problem.**Locked

SV-EOOW-ORALS-M2 · Electrical, electronic and control engineering at the operational level

6 lessons

SV-EOOW-ORALS-M2-A Electrical quantities, switchboard protection, generators, shore power, safe isolation and batteries as the SV EOOW syllabus frames them.

In preparation
SV-EOOW-ORALS-L2.1Electrical quantities and switchboard instrumentationThe syllabus asks for volts, amps, hertz and kilowatts. **The examiner wants to see you can read a generator panel and explain why kW and amps tell you different things.**LockedSV-EOOW-ORALS-L2.2Switchboard protection: reverse power, preferential trips, earth monitoring, breakers and fusesThis is one syllabus line with seven items in it. **For each device, say what it protects, what makes it act, and what you do when it does.**LockedSV-EOOW-ORALS-L2.3Preparing, starting, synchronising and changing over generatorsParalleling is the practical electrical task the examiner is most likely to make you talk through. **Match voltage, frequency and phase; close; share the load; then take the other set off cleanly.**LockedSV-EOOW-ORALS-L2.4Shore power: connection and disconnectionYachts spend a large part of the year on shore power in marinas with very different supplies. **Know what you check before closing the breaker, and what goes wrong when you do not.**LockedSV-EOOW-ORALS-L2.5Safe isolation, electrical maintenance and electric shockTwo syllabus lines: safety precautions for maintaining electrical equipment, and immediate action for electric shock. **Prove it dead before you touch it; isolate before you touch the casualty.**LockedSV-EOOW-ORALS-L2.6Storage batteries for marine useYachts now carry lead-acid, alkaline and lithium-ion batteries in engine rooms, tenders and toys. **Know each type's hazard and what keeps it safe.**Locked

SV-EOOW-ORALS-M3 · Maintenance and repair at the operational level

3 lessons

SV-EOOW-ORALS-M4 · Controlling the operation of the ship and care for persons on board at the operational level

9 lessons

SV-EOOW-ORALS-M4-A Watertight integrity and emergencies, machinery space fire, MARPOL and pollution prevention, bunkering, enclosed spaces and the ISM, MLC and COSHH framework.

In preparation
SV-EOOW-ORALS-L4.1Watertight integrity, flooding, collision and groundingThe syllabus pairs the importance of watertight integrity with immediate actions for flooding, collision and grounding. **Keep the water out; when it gets in, find it, fight it, and tell the bridge.**LockedSV-EOOW-ORALS-L4.2Fire in the machinery space: prevention and immediate actionThe syllabus asks for precautions to reduce machinery space fires and immediate action on fire. **Most engine room fires are fuel or lube oil on a hot surface. Stop that and you stop most fires.**LockedSV-EOOW-ORALS-L4.3Machinery space fire-fighting arrangementsThe syllabus names portable appliances, fixed installations, quick-closing valves, emergency stops, fire flaps and doors. **Explain how each one closes down the fire, and the sequence for a total flooding release.**LockedSV-EOOW-ORALS-L4.4Oily water separator, MARPOL Annex I and the Oil Record BookThe syllabus asks for use of the oily water separator, precautions to prevent pollution, and compilation of the Oil Record Book. **Say the discharge conditions exactly, and never suggest a short cut.**LockedSV-EOOW-ORALS-L4.5Sewage treatment plant and MARPOL Annex IVThe syllabus asks for sewage plant operation and its potential health risks, and Annex IV. **Keep the bacteria alive, keep the gases out of your lungs, and know the discharge distances.**LockedSV-EOOW-ORALS-L4.6Garbage and air emissions: MARPOL Annexes V and VI, and awareness of II and IIIThe syllabus asks for knowledge and impact of Annexes I, IV, V and VI and awareness of II and III. **For a yacht engineer, Annex VI is fuel sulphur, engine NOx and refrigerants; Annex V is the garbage plan and record book.**LockedSV-EOOW-ORALS-L4.7Bunkering operationsThe syllabus asks for preparations, procedures, checks and pollution prevention in bunkering. **Plan it, communicate it, watch it, and be ready to stop it.**LockedSV-EOOW-ORALS-L4.8Enclosed spaces and permit to workThis is where examiners impose sea-time penalties for unsafe answers. **Identify the space, ventilate, test, permit, attend, and never go in to rescue without breathing apparatus.**LockedSV-EOOW-ORALS-L4.9ISM, MLC and COSHH on boardThree short syllabus lines examiners often combine: the ISM Code, the Maritime Labour Convention, and basic COSHH. **Show how each shapes an engineer's day, not just what the letters stand for.**Locked