Y-codes closed 1 January 2023: the Y4, Y3, Y2 and Y1 certificate routes under MSN 1859 were closed to new applicants on 1 January 2023. If you are starting your engineering career now, you follow the MSN 1904 route below. Existing Y-code holders may revalidate and may convert to SV CoC routes via MIN 642.
How the engineering career ladder works
Yacht engineering qualifications in the UK are governed by MSN 1904 (M+F) for the small-vessel route, and by MSN 1857 Amendment 1 for the merchant navy unlimited route. The small-vessel route is the standard path for engineers working on yachts up to 9,000 kW and 3,000 GT, which covers the vast majority of superyachts. Verify current requirements with the MCA at gov.uk/guidance/engineering-officers-and-ratings before applying.
As with all professional yacht crew, STCW Basic Safety Training and an ENG1 seafarer medical are mandatory before you can work on any commercial yacht, regardless of the engineering route you follow.
The entry point for the current yacht engineering route under MSN 1904. AEC Level 1 is a five-day course covering the fundamentals of marine engineering. No sea time is required before enrolling, but sea time toward MEOL(SV) only begins counting after AEC1 is awarded. Minimum age 18. This course must be completed at an MCA-approved training centre.
Sea time: none required to enrolAEC Level 2 is a five-day course building on AEC1. You must hold AEC1 before enrolling. No additional sea time is required. On completion of AEC2, you can begin accumulating sea time that counts toward the MEOL(SV) requirements.
Sea time: none required to enrol; qualifying sea time begins after AEC2The first formal MCA CoC in the engineering ladder. The MEOL(SV) covers vessels with propulsion power between 200 kW and 750 kW. Two sea-time pathways: Pathway A requires 36 months dual-purpose deck and engineer service responsible for maintenance on vessels of 200 kW or more; Pathway B requires 24 months as yacht engineer responsible for system maintenance on 200 kW or more vessels. Both require a minimum of 6 months actual sea service within 5 years preceding application, with yard and refit time capped at 90 days.
Pathway A: 36 months dual-purpose service on 200 kW+ · Pathway B: 24 months as yacht engineer on 200 kW+ · Minimum 6 months actual sea service within 5 years (MSN 1904)Chief Engineer on small vessels up to 3,000 kW and 500 GT. Requires 6 months seagoing service as Second Engineer on qualifying vessels, with at least 6 months within 5 years preceding application. Training modules include SV Marine Diesel Engineering, SV Auxiliary Equipment I and II, SV Operational Procedures, and Chief Engineer Statutory and Operational Requirements. Governed by MSN 1904.
Sea time: 6 months seagoing service as Second Engineer on qualifying vessels (MSN 1904)Chief Engineer on vessels up to 9,000 kW and 3,000 GT, covering most large superyachts. This is the top of the current small-vessel engineering route. SQA written examinations cover General Engineering Science I and II and Applied Marine Engineering. Requires HELM Management and Engine Room Resource Management at this level. Exact sea-time figures were not available in the governing notice at the time of writing, always verify with the MCA before applying.
Sea time: service as SV Chief or Second Engineer on qualifying vessels, verify exact figure with MCA (MSN 1904)Where the Y-codes fit: holders of legacy Y4, Y3, Y2 or Y1 certificates from before 1 January 2023 can still revalidate those certificates and convert to the new SV routes via MIN 642 conversion routes. If you are starting fresh, none of the Y-code routes are available to you, follow the AEC/MEOL(SV) path above.
What most engineering candidates come from
Engineers enter yachting from a range of backgrounds: marine engineering, electrical trades, HVAC, plumbing, refrigeration and diesel mechanics are all common starting points. Relevant trade certifications alongside STCW and ENG1 are the typical entry point. The AEC1 and AEC2 courses are accessible without a marine engineering background, though prior mechanical knowledge is beneficial.
PDSD and larger-vessel endorsements
Engineering crew on vessels over 500 GT must also hold PDSD (Proficiency in Designated Security Duties). Crowd Management and Crisis Management endorsements are required on passenger-carrying yachts for senior crew with muster responsibilities. These apply regardless of engineering rank.
How much do superyacht engineers earn?
Engineering is one of the best paid departments at sea, and Chief Engineer pay climbs sharply with vessel size:
| Role | Indicative monthly pay |
|---|---|
| Junior / 3rd Engineer | €3,500 to €5,000 |
| Second Engineer | €4,500 to €7,000 |
| Chief Engineer | €6,000 to €20,000 |
Indicative monthly ranges in euros, the industry standard currency. Pay scales with vessel size, rotation and flag, and excludes tips and bonuses. Figures are blended from published 2026 yacht crew salary guides (YPI Crew, Foreland Marine and others); always confirm current rates before relying on them.
Where to train: superyacht engineering courses
The engineering route runs from your first AEC ticket up to an unlimited Chief Engineer Certificate of Competency. Compare providers, dates and locations in the YachtSync training directory.
- STCW Basic Safety Training
- AEC, MEOL(SV) and the small-vessel tickets
- Small-vessel EOOW and Chief Engineer, yacht track
- Engineer Officer of the Watch (STCW III/1)
- Second Engineer Officer Certificate of Competency
- Chief Engineer Officer Certificate of Competency
- Engine Room Resource Management
Frequently asked questions
What engineering qualifications do I need to work on a superyacht?
Start with STCW BST and ENG1, mandatory for all professional crew. Then AEC Level 1 and Level 2 at an MCA-approved centre. After that, accumulate the qualifying sea time for MEOL(SV) and work toward Chief Engineer. Browse relevant training courses in the Training Directory.
Are the Y-codes still available?
No. The Y4, Y3, Y2 and Y1 routes closed to new applicants on 1 January 2023. New engineers follow the MSN 1904 route (AEC1, AEC2, MEOL(SV)). Existing holders can revalidate and convert via MIN 642.
What is the MEOL(SV)?
The Small Vessel Marine Engine Operator Licence is the first formal MCA engineering CoC in the current route. It covers vessels 200 kW to 750 kW and requires either 36 months dual-purpose service or 24 months as yacht engineer on qualifying vessels, plus STCW BST, PSCRB, Advanced Fire Fighting, Medical First Aid, AEC1 and AEC2.
How do I become a Chief Engineer on a superyacht?
The MSN 1904 path runs: AEC1, AEC2, MEOL(SV), SV Chief under 3,000 kW/500 GT (6 months as Second Engineer), then SV Chief under 9,000 kW/3,000 GT. Each stage requires MCA examinations. Verify current requirements at gov.uk/guidance/engineering-officers-and-ratings.
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