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CODE OF FEDERAL REGULATIONS – TITLE
33 – NAVIGATION AND NAVIGABLE WATERS
PART 183—BOATS AND ASSOCIATED EQUIPMENT
Subpart A
Authority: 46 U.S.C. 4302; 49 CFR 1.46.
Source: CGD 72-61R, 37 FR 15782, Aug. 4, 1972, unless otherwise
noted.
GENERAL
Sec. 183.1—Purpose and applicability
This part prescribes standards and regulations
for boats and associated equipment to which 46 U.S.C. Chapter
43 applies and to which certification requirements in Part
181 of this subchapter apply.
[CGD 85-098, 52 FR 19728, May 27, 1987]
Sec. 183.3—Definitions
Beam means the transverse distance between the
outer sides of the boat excluding handles, and other similar
fittings, attachments, and extensions.
Boat means any vessel—
(1) Manufactured or used primarily for noncommercial
use;
(2) Leased, rented, or chartered to another
for the latter’s noncommercial use; or
(3) Operated as an uninspected passenger vessel
subject to the requirements of 46 CFR Chapter I, Subchapter
C.
Full transom means a transom with a maximum
width which exceeds one-half the maximum beam of the boat.
Length means the straight line horizontal measurement
of the overall length from the foremost part of the boat to
the aftermost part of the boat, measured from end to end over
the deck excluding sheer, and measured parallel to the centerline.
Bow sprits, bumpkins, rudders, outboard motor brackets, handles,
and other similar fittings, attachments, and extensions are
not included in the measurement.
Monohull boat means a boat on which the line
of intersection of the water surface and the boat at any operating
draft forms a single closed curve. For example, a catamaran,
trimaran, or a pontoon boat is not a monohull boat.
Motorwell means any arrangement of bulkheads
or structures that prevents water from entering the passenger
carrying area of the boat through any cutout area in the transom
for mounting an outboard motor.
Motorwell height means the vertical distance
from the lowest point of water ingress along the top of the
motorwell to a line representing a longitudinal extension
of the centerline of the boat’s bottom surface, excluding
keels. This distance is measured as a projection on the centerline
plane of the boat. See Figure 183.3.
Permanent appurtenances means equipment that
is mounted or fastened, so that it is not removable without
the use of tools. Seats, inboard engines, windshields, helm
stations, or hardtops are permanent appurtenances. Outboard
motors, controls, batteries, and portable fuel tanks are not
permanent appurtenances.
Remote steering means any mechanical assist
device which is rigidly attached to the boat and used in steering
the vessel, including but not limited to mechanical, hydraulic,
or electrical control systems.
Sailboat means a boat designed or intended to
use sails as the primary means of propulsion.
Sheer means the topmost line in a boat’s
side. The sheer intersects the vertical centerline plane of
the boat at the forward end and intersects the transom (stern)
at the aft end. For the purposes of this definition, the topmost
line in a boat’s side is the line defined by a series
of points of contact with the boat structure, by straight
lines at 45 degree angles to the horizontal and contained
in a vertical plane normal to the outside edge of the boat
as seen from above and which are brought into contact with
the outside of the horizontal boat. A boat is horizontal when
it is transversely level and when the lowest points at 40
percent and 75 percent of the boat’s length behind the
most forward point of the boat are level.
Transom means the surface at the stern of a
boat projecting or facing aft. The upper boundary of the transom
is the line defined by a series of points of contact, with
the boat structure, by straight lines at 45 degree angles
to the horizontal and contained in a vertical longitudinal
plane and which are brought into contact with the stern of
the horizontal boat. A boat is horizontal when it is transversely
level and when the lowest points at 40 percent and 75 percent
of the boat’s length behind the most forward point of
the boat are level.
Transom height means the vertical distance from
the lowest point of water ingress along the top of the transom
to a line representing a longitudinal extension of the centerline
of the boat’s bottom surface, excluding keels. This
distance is measured as a projection on the centerline plane
of the boat. See Figure 183.3.
Vessel includes every description of watercraft,
other than a seaplane on the water, used or capable of being
used as a means of transportation on the water.
Figure
183.3—Transom and Motorwell Height
[CGD 73-250, 40 FR 43856, Sept. 23, 1975,
as amended by CGD 75-176, 42 FR 2681, Jan. 13, 1977; CGD 85-002,
51 FR 37574, Oct. 23, 1986; CGD 96-026, 61 FR 33669, June
28, 1996; 61 FR 36629, July 12, 1996; USCG-1999-5040, 67 FR
34760, May 15, 2002]
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