Entry & progression
The Electro-technical Rating (STCW III/7) is the electrical rating. Age 18. Twelve months seagoing, or an approved programme plus six, or demonstrated A-III/7 competence plus three — plus approved courses in computer systems and high-voltage power systems.
Modern yachts are electrical vessels that happen to have diesels in them. The lighting is networked, the stabilisers are electric, the AV is a small data centre, the switchboard has a screen, and on the larger boats the distribution runs at voltages that will kill you without touching you. The ETR is the rating that exists for that world.
The three routes in
| Route | Requirement |
|---|---|
| Sea service | 12 months of seagoing service |
| Approved programme | An approved programme, plus not less than 6 months at sea |
| Competence route | Demonstrated A-III/7 competence, plus not less than 3 months of approved sea service |
Minimum age: 18. Governing regulation: 46 CFR 12.611.
The two courses you cannot skip
Whichever route you take, 12.611 requires approved courses in both:
- Computer systems and maintenance — the vessel's networks, controls and the machines that run them.
- High-voltage power systems — and this is the serious one.
WARNING — High voltage does not forgive High-voltage systems do not require contact to kill — an arc will cross to you. The switching, isolation and permit discipline on an HV system is not a bureaucratic formality laid over ordinary electrical work; it is a different trade with a different set of rules. That is precisely why the regulation names the course. If you are working on a boat with HV distribution and you have not been trained on it, do not touch the system. Not once. Not to be helpful.
Where the ratings bite
This is the practical question behind the whole of Module 3: when does a yacht actually need STCW-endorsed engine ratings aboard? The answer is in 46 CFR 15.1103.
15.1103(a) sets the general trigger — a seagoing vessel of 500 GT or more, driven by main propulsion machinery of 1,000 HP / 750 kW or more, or on an international voyage beyond the boundary line.
But 15.1103(d) and (e) — the ratings triggers for RFPEW and Able Seafarer-Engine — attach at 1,000 HP / 750 kW or more with no gross tonnage threshold whatsoever. Read that again. The engine ratings requirement is a power test. Tonnage does not appear in it.
NOTE — Engineering is scoped in power, not tonnage This is the governing habit of mind for the whole department. Deck endorsements are titled in gross tonnage. Engineering endorsements are titled in horsepower and kilowatts. "3,000 GT" has no engineering meaning at all. (The one qualification: gross tonnage does cap some of the lower national officer grades — Module 4 — but it is not how engineering is scoped.)
CAUTION — Confirm the trigger for the ETR itself The 1,000 HP / 750 kW ratings triggers at 15.1103(d) and (e) are stated for RFPEW and Able Seafarer-Engine. Do not assume the same subsection governs when an ETR must be carried — check the current text of 15.1103 and the vessel's manning document, and ask the NMC or the OCMI if it is not clear.