46 C.F.R. § 15.825 Engineers.
Title 46 - Shipping
(a) An individual in charge of an engineering watch on a mechanically propelled, seagoing, documented vessel of 200 gross tons or over, other than an individual described in §15.820, must hold an appropriate license authorizing service as an assistant engineer. (b) The Officer in Charge, Marine Inspection determines the minimum number of licensed engineers required for the safe operation of inspected vessels.
Title 46: Shipping
PART 15—MANNING REQUIREMENTS
Subpart G—Computations
§ 15.825 Engineers.