Entry & progression
Every DDE entry path into STCW carries the same footnote: "STCW certificate should be limited to vessels less than 500 GRT." Tables at 11.325(d), 11.327(d), 11.329(e) and 11.331(e). A DDE-derived III/2 is legally useless on a large yacht.
The footnote
Look at every table in Subpart C that admits a DDE. 11.325(d) — DDE, any horsepower, 24 months. 11.327(d) — DDE-Unlimited, 12 months. 11.329(e) — OICEW. 11.331(e) — the III/3 chief. Every one of them footnoted:
WARNING — "STCW certificate should be limited to vessels less than 500 GRT" It does not matter which STCW endorsement you enter through a DDE. The certificate that comes out the other end is capped at less than 500 GRT.
A III/2 Chief Engineer Officer endorsement limited to vessels of less than 500 GRT will not let you take the chief's berth on a 2,000 GT yacht. You will have earned a management-level convention certificate that cannot be used on the boats it was designed for. It is not a cheaper route to the same place. It is a route to a different place.
Why — and it is not arbitrary
The DDE is capped at less than 500 GRT nationally too. 11.524(a): "These endorsements are limited to vessels of less than 500 GRT." All three tiers. And the lower two tiers are worse than that — DDE under 1,000 HP and DDE under 4,000 HP are near-coastal or inland only. No oceans.
NOTE — "DDE-Unlimited" means unlimited HORSEPOWER — not an unlimited vessel The biggest trap on the engineering side. DDE-Unlimited is still less than 500 GRT. The word 'unlimited' in that title refers to propulsion power, and to nothing else. If you have been telling yourself that DDE-Unlimited is a ticket without a ceiling, correct it today.
The Coast Guard is being internally consistent. A national credential capped at 500 GRT should not become an international credential without a cap. It exports the limitation. That is coherent regulation and a career cul-de-sac at the same time.
So what does a DDE-holding yacht engineer actually do?
Two doors, and both mean building service in a different national grade. The DDE does not upgrade. You climb past it.
| Door | The national grade you build | What it asks | Then, for STCW III/2 |
|---|---|---|---|
| 1 — Limited | Chief Engineer-Limited (11.518) | 5 years engineroom; 2 years as an engineer officer while holding an endorsement; 30 months as QMED or equivalent. Age 21. | 12 months additional (Table 1 to 11.325(d)) |
| 2 — Unlimited | Third → Second → First Assistant → Chief Engineer | The unlimited ladder in Subpart E. Exactly two exams: 3rd A/E and 1st A/E. | None — a national Chief Engineer walks straight in |
Door 1 has a crossover worth knowing: one year as Chief Engineer-Limited, plus the appropriate examination, equals First Assistant Engineer (unlimited) — 11.512(a)(2). The Limited ladder is not a sealed compartment. It joins the main line.
And the wall is still there
Whichever door you take, the 4,000 HP gate from Lesson 2.3 does not go away. Neither Chief Engineer nor Chief Engineer-Limited will carry a III/2 unless the endorsement itself is rated for at least 4,000 HP. Get the grade. Then get the horsepower. Then the STCW certificate follows.