of the United States or Canada, and that is’’ 
after ‘‘vessel’’; 
(C) in paragraph (4), by striking ‘‘a vessel 
(except a vessel engaged’’ and inserting ‘‘a ves-
sel of United States registry or nationality, or 
one operated under the authority of the United 
States (except a vessel that engages’’; 
(D) by striking paragraph (5); 
(E) by redesignating paragraph (6) as 
paragraph (5); and 
(F) by amending paragraph (5), as so re-
designated, to read as follows: 
‘‘(5) a barge of United States registry or na-
tionality, or a barge operated under the authority of 
the United States (except a barge that engages on 
a foreign voyage) unless the owner requests.’’; 
(3) by striking subsection (c); 
(4) by redesignating subsections (d) and (e) as 
subsections (c) and (d), respectively; and 
(5) in subsection (c), as redesignated, by strik-
ing ‘‘After July 18, 1994, an existing vessel (except 
an existing vessel referred to in subsection (b)(5)(A) 
or (B) of this section)’’ and inserting ‘‘An existing 
vessel that has not undergone a change that the Sec-
retary finds substantially affects the vessel’s gross
tonnage (or a vessel to which IMO Resolutions 
A.494 (XII) of November 19, 1981, A.540 (XIII) of 
November 17, 1983, or A.541 (XIII) of November 
17, 1983 apply)’’. 
(d) MEASUREMENT.—Section 14302(b) of that title 
is amended to read as follows: 
‘‘(b) A vessel measured under this chapter may not 
be required to be measured under another law.’’. 
(e) TONNAGE CERTIFICATE.— 
(1) ISSUANCE.—Section 14303 of title 46, 
United States Code, is amended— 
(A) in subsection (a), by adding at the end 
the following: ‘‘For a vessel to which the Con-
vention does not apply, the Secretary shall pre-
scribe a certificate to be issued as evidence of 
a vessel’s measurement under this chapter.’’; 
(B) in subsection (b), by inserting ‘‘issued 
under this section’’ after ‘‘certificate’’; and 
(C) in the section heading by striking 
‘‘International’’ and ‘‘(1969)’’. 
(2) MAINTENANCE.—Section 14503 of that title 
is amended— 
(A) by designating the existing text as sub-
section (a); and
(B) by adding at the end the following new 
subsection: 
‘‘(b) The certificate shall be maintained as required 
by the Secretary.’’. 
(3) CLERICAL AMENDMENT.—The analysis at 
the beginning of chapter 143 of that title is amend-
ed by striking the item relating to section 14303 and 
inserting the following: 
‘‘14303. Tonnage Certificate.’’. 
(f) OPTIONAL REGULATORY MEASUREMENT.—Sec-
tion 14305(a) of that title is amended by striking ‘‘docu-
mented vessel measured under this chapter,’’ and inserting 
‘‘vessel measured under this chapter that is of United 
States registry or nationality, or a vessel operated under 
the authority of the United States,’’. 
(g) APPLICATION.—Section 14501 of that title is 
amended— 
(1) by amending paragraph (1) to read as fol-
lows: 
‘‘(1) A vessel not measured under chapter 143 
of this title if the application of an international 
agreement or other law of the United States to the 
vessel depends on the vessel’s tonnage.’’; and 
(2) in paragraph (2), by striking ‘‘a vessel’’ and 
inserting ‘‘A vessel’’.
(h) 
DUAL
TONNAGE
MEASUREMENT.—Section 
14513(c) of that title is amended— 
(1) in paragraph (1)— 
(A) by striking ‘‘vessel’s tonnage mark is 
below the uppermost part of the load line 
marks,’’ and inserting ‘‘vessel is assigned two 
sets of gross and net tonnages under this sec-
tion,’’; and 
(B) by inserting ‘‘vessel’s tonnage’’ before 
‘‘mark’’ the second place such term appears; 
and 
(2) in paragraph (2), by striking the period at 
the end and inserting ‘‘as assigned under this sec-
tion.’’. 
(i) RECIPROCITY
FOR FOREIGN VESSELS.—Sub-
chapter II of chapter 145 of that title is amended by add-
ing at the end the following: 
‘‘§ 14514. Reciprocity for foreign vessels 
‘‘For a foreign vessel not measured under chapter 
143, if the Secretary finds that the laws and regulations 
of a foreign country related to measurement of vessels are 
substantially similar to those of this chapter and the regu-
lations prescribed under this chapter, the Secretary may 
accept the measurement and certificate of a vessel of that