This subchapter applies to a vessel described in section 14501 of this title if-
(1) the owner requests; or
(2) the vessel is-
(A) self-propelled;
(B) at least 24 meters (79 feet) overall in length; and
(C) not operated only for pleasure.
(
Source: Section (U.S. Code) 46 App. U.S.C. 71.
Section 14511 lists the types of vessels that are to be measured under the standard regulatory measurement system. They are vessels for which the owner requests a standard measurement or vessels which are self-propelled, at least 79 feet in length, and not operated only for pleasure.