46 C.F.R. § 10.402 Tonnage requirements for ocean or near coastal licenses for vessels of over 1600 gross tons.
Title 46 - Shipping
(a) To qualify for an ocean or near coastal license for vessels of any gross tons, all the required experience must be obtained on vessels of over 200 gross tons. At least one-half of the required experience must be obtained on vessels of over 1600 gross tons. (b) If the applicant for an original or raise of grade of a license as master or mate does not have the service on vessels over 1600 gross tons required by paragraph (a) of this section, or is qualifying for third mate under the provisions of paragraph §10.407(c) of this subpart, a tonnage limitation is placed on the license based on the applicant's qualifying experience. The license is limited to the maximum tonnage on which at least 25 percent of the required experience was obtained, or 150 percent of the maximum tonnage on which at least 50 percent of the service was obtained, whichever is higher. Limitations are in multiples of 1000 gross tons, using the next higher figure when an intermediate tonnage is calculated. When the calculated limitation equals or exceeds 10,000 gross tons, the applicant is issued an unlimited tonnage license. (c) Tonnage limitations imposed under paragraph (b) of this section may be raised or removed in the following manner: (1) When the applicant has six months of service on vessels of over 1600 gross tons in the highest grade licensed, all tonnage limitations are removed. (2) When the applicant has a total of six months of service on vessels of over 1600 gross tons in any licensed capacity other than the highest grade for which licensed, all tonnage limitations for the grade in which the service is performed are removed and the next higher grade license is raised to the tonnage of the vessel on which the majority of the service was performed. The total cumulative service before and after issuance of the limited license may be considered in removing all tonnage limitations. (3) When the applicant has 12 months of service as able seaman on vessels over 1600 gross tons while holding a license as third mate, all tonnage limitations on the third mate's license are removed. (d) Individuals holding licenses as master or mate of vessels of not more than 1600 gross tons, not more than 500 gross tons, or not more than 25–200 gross tons are prohibited from using the provisions of paragraph (c) of this section to increase the tonnages of their licenses. [CGD 81–059, 52 FR 38623, Oct. 16, 1987, as amended by CGD 81–059, 54 FR 135, Jan. 4, 1989]
Title 46: Shipping
PART 10—LICENSING OF MARITIME PERSONNEL
Subpart D—Professional Requirements for Deck Officers' Licenses
§ 10.402 Tonnage requirements for ocean or near coastal licenses for vessels of over 1600 gross tons.

