1. (a) National engineer endorsements are issued in the grades of—

   1. (1) Chief Engineer;
   2. (2) First Assistant Engineer;
   3. (3) Second Assistant Engineer;
   4. (4) Third Assistant Engineer;
   5. (5) Chief Engineer-Limited;
   6. (6) Assistant Engineer-Limited;
   7. (7) Designated Duty Engineer (DDE);
   8. (8) Chief Engineer Uninspected Fishing Industry Vessels;
   9. (9) Assistant Engineer Uninspected Fishing Industry Vessels;
   10. (10) Chief Engineer-MODU;
   11. (11) Assistant Engineer-MODU;
   12. (12) Chief Engineer-OSV; and
   13. (13) Assistant Engineer-OSV.

2. (b) Engineer endorsements issued in the grades of Chief Engineer-Limited and Assistant Engineer-Limited of steam, motor, and/or gas turbine-propelled vessels allow the holder to serve within any propulsion power limitations on vessels of unlimited tonnage on inland waters and of less than 1,600 GRT in ocean, near-coastal, or Great Lakes service in the following manner:

   1. (1) Chief Engineer-Limited may serve on oceans and near-coastal waters.
   2. (2) Assistant Engineer-Limited may serve on ocean and near-coastal waters.

3. (c) Engineer MMC endorsements issued in the grades of Designated Duty Engineer of steam, motor, and/or gas turbine-propelled vessels allow the holder to serve within stated propulsion power limitations on vessels of less than 500 GRT in the following manner:

   1. (1) Designated Duty Engineers-Limited to vessels of less than 1,000 HP or 4,000 HP may serve only on near-coastal or inland waters.
   2. (2) Designated Duty Engineers-Unlimited may serve on any waters.
4. (d) An engineer officer MMC endorsement authorizes service on steam, motor, or gas turbine-propelled vessels or may authorize all modes of propulsion.
5. (e) A person holding an engineer MMC endorsement that is restricted to near-coastal waters may serve within the limitations of the MMC upon near-coastal, Great Lakes, and inland waters.

[USCG-2021-0097, 89 FR 93092, Nov. 25, 2024, as amended by USCG-2021-0834, 89 FR 102336, Dec. 17, 2024]