46 C.F.R. § 10.404 Service requirements for master of ocean or near coastal steam or motor vessels of any gross tons.
Title 46 - Shipping
The minimum service required to qualify an applicant for license as master of ocean or near coastal steam or motor vessels of any gross tons is: (a) One year of service as chief mate on ocean steam or motor vessels; or, (b) One year of service on ocean steam or motor vessels while holding a license as chief mate of ocean steam or motor vessels as follows: (1) A minimum of six months of service as chief mate; and, (2) Service as officer in charge of a navigational watch accepted on a two-for-one basis (12 months as second or third mate equals six months of creditable service).
Title 46: Shipping
PART 10—LICENSING OF MARITIME PERSONNEL
Subpart D—Professional Requirements for Deck Officers' Licenses
§ 10.404 Service requirements for master of ocean or near coastal steam or motor vessels of any gross tons.