Chief mate
Chief mate means the deck officer next in rank to the master and upon whom the command of the vessel will fall in the event of incapacity of the master.
Source
46 CFR § 10.107
Scoping language
With respect to part 16 of this subchapter only, if the definitions in paragraph (b) of this section differ from those set forth in 16.105, the definition set forth in 16.105 applies.