Entry & progression
RFPEW (STCW III/4) is the international ticket that lets you count as part of the engineering watch. Age 16. Six months seagoing under supervision — or nothing at all, if you already hold a QMED.
The national ratings in Module 2 are American paper. They work on American vessels. The moment the vessel is seagoing and large enough to fall under the Convention, a second layer appears: the STCW engine ratings, which live in 46 CFR Part 12 Subpart F. RFPEW is the first of them, and it is the one every engine rating on a seagoing yacht needs.
What it is
Rating Forming Part of an Engineering Watch — STCW Regulation III/4, at 46 CFR 12.609. It is the certificate that says you are competent to be counted as part of a watch below rather than merely present in the space. It is a support-level endorsement: you perform assigned tasks under the direction of somebody at the operational or management level.
The two routes in
| Route | Requirement |
|---|---|
| Sea service | 6 months of seagoing service in the engine department, under the supervision of an engineer officer or a qualified STCW rating |
| Training + sea | Approved training, which must include not less than 2 months of approved seagoing service |
Minimum age: 16. It is the youngest endorsement in the engineering pathway.
The shortcut nobody tells you about
TIP — Any QMED gets RFPEW with NO additional service Coming from the national side, the entry is set out plainly: any QMED rating = no additional service for RFPEW. A Wiper needs the full 6 months. So the QMED you built in Module 2 does not just sit on the credential — it opens the STCW rating for free. If you are anywhere near a QMED, finish it first and take the RFPEW as the bonus it is.
You need the national endorsement underneath it
46 CFR 12.601(a) carries the same rule for ratings that 11.201(a) carries for officers: an applicant for an STCW endorsement must hold the appropriate national endorsement. The STCW rating is a layer on top of the national one, not a replacement for it. You do not skip the American ladder by going international — you climb both at once.
What supervision means
Read the service requirement again: six months under the supervision of an engineer officer or a qualified STCW rating. On a well-run boat this is invisible — you are simply working for the second engineer. On a badly-run one, where you are the only person below and nobody above you holds anything, the time may not be creditable as supervised service at all.
WARNING — Check who is above you before you take the job Sea time you cannot claim is sea time you did not do. Before you sign onto a boat expecting to build RFPEW service, find out who holds what. A yacht with an uncredentialed engineer and no officer above you is a poor place to build supervised engine-room service — however good the boat, and however much you learn.
Where it bites
The engine ratings are triggered by power, not size. 46 CFR 15.1103(d) and (e) attach the RFPEW and Able Seafarer-Engine requirements at 1,000 HP / 750 kW or more — with no gross tonnage threshold at all. That is worth pausing on. A seagoing vessel can be well under 500 GT and still need STCW-endorsed engine ratings, because the trigger is what the mains produce, not what the hull measures.