Yacht Engine Department
Yacht engineers hold STCW Chapter III CoCs or MCA Small Vessel engineer certificates — flag-state governed under the Large Yacht Codes. On large superyachts the standard merchant STCW III/2 ladder applies. On smaller yachts the MCA SV certificate series (which replaced the legacy Y-ticket designations) provides a proportionate alternative accepted by many flag states.
Two yacht-distinctive manning patterns — the Sole Engineer and the Dual Deck/Engine Officer — arise specifically below 40m and 24m vessel sizes.
MCA Small Vessel engineer certificates.
For engineers whose sea service was accumulated on yachts and small commercial vessels, MCA issues the SV (Small Vessel) engineer certificate series. Y-ticket designations (Y4, Y3, Y2, Y1) are the legacy names — they were replaced by the SV series; existing holders' certificates remain valid.
| MCA SV Certificate | Legacy Y-Ticket | Scope |
|---|---|---|
| Auxiliary Engineer Certificate 1 (AEC1) | — | Entry-level small vessels |
| Auxiliary Engineer Certificate 2 (AEC2) | — | Small vessels, higher kW threshold |
| SV Second Engineer | Y4 | Second Engineer on SV |
| SV Chief Engineer <3,000 kW | Y3 | Chief Engineer on SV up to 3,000 kW |
| SV Chief Engineer <9,000 kW | Y2 / Y1 | Chief Engineer on SV up to 9,000 kW |
Source: Merchant Shipping (Large Commercial Yacht) Regulations 2012; MCA MGN 280 series. Flag state acceptance of SV certificates varies — confirm with your flag state administration before signing on.
Chief Engineer, Second Engineer, ETO, Junior Engineer.
Management level · Reports to Captain
Chief Engineer (Yacht)
Responsible for all propulsion and auxiliary machinery, fuel and lube oil management, MARPOL engineering compliance, yard period technical management and engineering documentation. Reports directly to the Captain. On large superyachts above 3,000 kW, the Chief Engineer must hold the standard STCW III/2 C/E unlimited CoC; on smaller yachts an SV Chief Engineer certificate may satisfy the flag state.
Certificate options (flag-state-dependent):
STCW Regulation III/2 CoC — Chief Engineer Officer (Unlimited) · SV Chief Engineer <9,000 kW (formerly Y2/Y1) · SV Chief Engineer <3,000 kW (formerly Y3)
Operational level · Reports to Chief Engineer
Second Engineer (Yacht)
Watchkeeping engineer; assists with all machinery maintenance; deputises for the Chief Engineer. On larger yachts this is a distinct role. On mid-size yachts the Chief Engineer may also perform Second Engineer duties (see Sole Engineer pattern below).
Certificate options (flag-state-dependent):
STCW Regulation III/2 CoC — 2nd Engineer Officer · STCW Regulation III/1 CoC — OOW Engineering · SV Second Engineer (formerly Y4)
ETO / AV-IT Officer (Yacht)
Yacht onlyOperational level · ETO CoC · Reports to Chief Engineer
On yachts, the ETO role commonly combines electrical, electronic, AV and IT responsibilities in a single officer. This combined ETO/AV-IT scope is yacht-distinctive — on merchant vessels AV and IT are separate departments. Scope: electrical and electronic systems, navigation electronics, AV systems and onboard entertainment, satellite communications, IT network and security.
Certificate: CoC — Electro-Technical Officer (STCW Regulation III/6; Table A-III/6 — Manila 2010). Operational level.
Entry level · Accumulating sea service · Reports to Second Engineer
Junior Engineer
Entry-level engine position on larger yachts. Accumulating STCW-approved sea service toward an OOW Engineering CoC. Works under Second Engineer and Chief Engineer supervision.
Sole Engineer and Dual Deck/Engine.
Two manning arrangements arise specifically on smaller yachts. Neither has a merchant or cruise equivalent.
Sole Engineer Pattern
Yacht onlyTypically <40m or <1,000 kW
A single engineer is responsible for all engineering functions: propulsion, auxiliaries, hotel systems, maintenance scheduling and MARPOL compliance. No assistant. This pattern places heightened individual responsibility and fatigue exposure on one person.
Hours of rest: MCA guidance specifically addresses sole engineer hours of rest compliance — the individual must manage planned maintenance, port calls and passages against MLC minimum rest requirements without the relief rotation available on larger vessels. Check flag state requirements carefully before accepting a sole engineer position.
Certificate: SV Chief Engineer or OOW Engineering CoC (flag-state-dependent)
Dual Deck/Engine Officer
Yacht onlyTypically <24m commercial yachts · MCA 50% sea-time split
On the smallest commercially operated yachts, a single officer handles both bridge watchkeeping and basic engineering responsibilities. Not permissible under standard STCW for vessels above applicable tonnage thresholds; permitted under flag-state yacht code Article IX equivalents. MCA guidance provides for 50% deck / 50% engine sea-service accounting for certification purposes.
Watermaker and HVAC.
Larger yachts carry dedicated watermaker and HVAC technicians within the engine department. Both are company-standard positions with trade qualifications — no STCW CoC is required.
Watermaker Technician
Yacht onlyReverse osmosis watermaker operation and maintenance; fresh water generator; water treatment and testing. Often combined with HVAC on mid-size yachts. Reports to Chief Engineer.
Trade qualification · BST mandatory · No STCW CoC
HVAC Technician
Yacht onlyHVAC system maintenance; refrigeration plant; chiller systems; galley refrigeration. F-Gas qualification is common in practice. Reports to Chief Engineer.
Refrigeration trade certificate · F-Gas · BST mandatory · No STCW CoC
The certificate pathway.
Yacht engineer careers can begin via the standard STCW Chapter III merchant pathway or via the MCA SV certificate series for those with yacht sea service. India and the UK are among the principal entry routes.
Talk to yacht engineers.
The Career & Recruitment category on the Marine One forum covers yacht engineering questions — from Junior Engineer first positions to Chief Engineer sole engineer roles.