46 CFR §11.501

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.