46 U.S.C. § 14304: Remeasurement

(a) To the extent necessary, the Secretary shall remeasure a vessel to which this chapter applies if—(1) the Secretary or the owner alleges an error in its measurement; or (2) the vessel or the use of its space is changed in a way that substantially affects its tonnage. (b) Except as provided in this chapter or section 14504 of this title, a vessel that has been measured does not have to be remeasured to obtain another document or endorsement under chapter 121 of this title.