The following MMC officer endorsements authorize the holder to serve as noted, within any restrictions on the MMC, and as provided by § 15.401:

1. (a) A Designated Duty Engineer (DDE) endorsement authorizes service as Chief or Assistant Engineer on vessels of less than 500 GT in the following manners:

   1. (1) A DDE limited to vessels of less than 1,000 horsepower or less than 4,000 horsepower may serve only on near-coastal, Great Lakes, or inland waters.
   2. (2) A DDE with no horsepower limitations may serve on any waters.
   3. (3) When serving on a vessel to which STCW applies, the appropriate STCW endorsement must also be held.
2. (b) A Chief Engineer-Limited endorsement authorizes service as Chief or Assistant Engineer on vessels of any gross tons on inland waters and of less than 1,600 GRT on ocean, near-coastal, or Great Lakes waters.
3. (c) An Assistant Engineer-Limited endorsement authorizes service on vessels of any gross tons on inland waters and of less than 1,600 GRT on ocean, near-coastal, or Great Lakes waters.

[USCG-2004-17914, 78 FR 78010, Dec. 24, 2013, as amended by USCG-2021-0834, 89 FR 102340, Dec. 17, 2024]