Title 33 NAVIGATION AND NAVIGABLE WATERS
PART 183 BOATS AND ASSOCIATED EQUIPMENT
46
U.S.C. 4302; Pub. L. 103206, 107 Stat. 2439; and Department of
Homeland Security Delegation No. 0170.1, para. II, (92)(b). Subpart E is
also authorized by
Pub. L. 114120, 130 Stat. 27
CGD
7261R,
37 FR 15782, Aug. 4, 1972, unless otherwise noted.
Subpart C—Safe Loading
§ 183.31 Applicability.
This subpart applies to monohull boats less than 20 feet in length
except sailboats, canoes, kayaks, and inflatable boats.
§ 183.33 Maximum weight capacity: Inboard and inboardoutdrive boats.
(a)
The maximum weight capacity (W) marked on a boat that has one or
more inboard or inboardoutdrive units for propulsion must not
exceed the greater value of W obtained from either of the following
formulas:
(b)
For the purposes of
paragraph (a) of this section:
(1)
“Maximum displacement” is the weight of the volume of water
displaced by the boat at its maximum level immersion in calm
water without water coming aboard. For the purpose of this
paragraph, a boat is level when it is transversely level and
when either of the two following conditions are met:
(i)
The forward point where the sheer intersects the vertical
centerline plane and the aft point where the sheer
intersects the upper boundary of the transom (stern) are
equidistant above the water surface or are equidistant below
the water surface.
(ii)
The most forward point of the boat is level with or above
the lowest point of water ingress.
(2)
“Boat weight” is the combination of:
(ii)
Deck and superstructure weight;
(iii)
Weight of permanent appurtenances; and
(iv)
Weight of full permanent fuel tanks.
(3)
“Machinery weight” is the combined weight of installed engines
or motors, control equipment, drive units, and batteries.
[CGD 7261R,
37 FR 15782, Aug. 4, 1972]
§ 183.35 Maximum weight capacity: Outboard boats.
(a)
The maximum weight capacity marked on a boat that is designed or
intended to use one or more outboard motors for propulsion must be a
number that does not exceed onefifth of the difference between its
maximum displacement and boat weight.
(b)
For the purposes of
paragraph (a) of this section:
(1)
“Maximum displacement” is the weight of the volume of water
displaced by the boat at its maximum level immersion in calm
water without water coming aboard except for water coming
through one opening in the motor well with its greatest
dimension not over 3 inches for outboard motor controls or fuel
lines. For the purpose of this paragraph, a boat is level when
it is transversely level and when either of the two following
conditions are met:
(i)
The forward point where the sheer intersects the vertical
centerline plane and the aft point where the sheer
intersects the upper boundary of the transom (stern) are
equidistant above the water surface or are equidistant below
the water surface.
(ii)
The most forward point of the boat is level with or above
the lowest point of water ingress.
(2)
“Boat weight” is the combination of:
(ii)
Deck and superstructure weight;
(iii)
Weight of permanent appurtenances; and
(iv)
Weight of full permanent fuel tanks.
[CGD 7261,
37 FR 15782, Aug. 4, 1972, as amended by CGD 73250,
40 FR 43857, Sept. 23, 1975; CGD 75176,
42 FR 2681, Jan. 13, 1977; USCG19995832,
64 FR 34716, June 29, 1999]
§ 183.37 Maximum weight capacity: Boats rated for manual propulsion and
boats rated for outboard motors of 2 horsepower or less.
(a)
The maximum weight capacity marked on a boat that is rated for
manual propulsion or for motors of 2 horsepower or less must not
exceed 3⁄10
of the difference between the boat's maximum displacement and the
boat's weight in pounds.
(b)
For the purposes of
paragraph (a) of this section:
(1)
“Maximum displacement” is the weight of the volume of water
displaced by the boat at its maximum level immersion in calm
water without water coming aboard. For the purpose of this
paragraph, a boat is level when it is transversely level and
when either of the two following conditions are met:
(i)
The forward point where the sheer intersects the vertical
centerline plane and the aft point where the sheer
intersects the upper boundary of the transom (stern) are
equidistant above the water surface or are equidistant below
the water surface.
(ii)
The most forward point of the boat is level with or above
the lowest point of water ingress.
(2)
“Boat weight” is the combination of:
(ii)
Deck and superstructure weight; and
(iii)
Weight of permanent appurtenances.
[CGD 7261R,
37 FR 15782, Aug. 4, 1972]
§ 183.39 Persons capacity: Inboard and inboardoutdrive boats.
(a)
The persons capacity in pounds marked on a boat that is designed to
use one or more inboard engines or inboardoutdrive units for
propulsion must not exceed the lesser of:
(1)
The maximum weight capacity determined under
§ 183.33 for the boat; or
(2)
For boats with a maximum persons capacity less than 550 pounds,
the maximum persons capacity determined in the following manner:
(i)
Float the boat in calm water with all its permanent
appurtenances, including installed engines, full fuel system
and tanks, control equipment, drive units and batteries.
(ii)
Gradually add weights along one outboard extremity of each
passenger carrying area, at the height of the seat nearest
the center of that area, but no higher than the height of
the gunwale and distributed equally forward and aft of that
center in a plane parallel to the floorboards, until the
boat assumes the maximum list or trim or both, without water
coming aboard.
(iii)
Compute the persons capacity in pounds in the following
formula: Persons capacity = A/0.6 where A is the total of
the weights added in
paragraph (a)(2)(ii) of this section.
(b)
The maximum persons capacity in whole numbers of persons marked on a
boat that is designed or intended to use one or more inboard engines
or inboardoutboard units must not exceed the value obtained by
adding 32 pounds to the value determined in paragraph (a)(2)(iii),
dividing the sum by 141 and rounding off the result to the nearest
whole number. If the fraction is less than onehalf, round down to
the next whole integer and if the fraction is equal to or greater
than onehalf, round up to the next higher whole integer.
[CGD 78034,
45 FR 2030, Jan. 10, 1980, as amended by CGD 83012,
49 FR 39328, Oct. 5, 1984;
50 FR 18636, May 2, 1985]
§ 183.41 Persons capacity: Outboard boats.
(a)
The persons capacity in pounds marked on a boat that is designed to
use one or more outboard motors for propulsion must not exceed the
lesser of:
(1)
The maximum weight capacity determined under
§ 183.35 for the boat minus the motor and control weight,
battery weight (dry), and full portable fuel tank weight
required by
§ 183.75; or
(2)
For boats with a maximum persons capacity less than 550 pounds,
the maximum persons capacity determined in the following manner:
(i)
Float the boat with all its permanent appurtenances.
(ii)
Add, in normal operating positions, the dry motor and
control weight, battery weight, and full portable fuel tank
weight, if any, required by
§ 183.75 for the maximum horsepower capacity marked on
the boat. Permanently installed fuel tanks shall be full of
fuel.
(iii)
Gradually add weights along one outboard extremity of each
passenger carrying area, at the height of the seat nearest
the center of that area, but no higher than the height of
the gunwale, and distributed equally forward and aft of that
center in a plane parallel to the floorboards until the boat
assumes the maximum list or trim, or both without water
coming aboard.
(iv)
Compute the persons capacity in pounds using the following
formula: Persons capacity = A/0.6 where A is the total of
the weights added in
paragraph (a)(2)(iii) of this section.
(b)
The maximum persons capacity in whole numbers of persons marked on a
boat designed or intended to use one or more outboard motors for
propulsion must not exceed the value obtained by adding 32 pounds to
the lesser of the values determined in paragraph (a)(1) or
(a)(2)(iv), dividing the sum by 141, and rounding off the result to
the nearest whole number. If the fraction is less than onehalf,
round down to the next lower whole integer and if the fraction is
equal to or greater than onehalf, round up to the next higher whole
integer.
[CGD 78034,
45 FR 2030, Jan. 10, 1980, as amended by CGD 83012,
49 FR 39328, Oct. 5, 1984;
50 FR 18636, May 2, 1985; USCG20161012,
82 FR 16521, Apr. 5, 2017]
§ 183.43 Persons capacity: Boats rated for manual propulsion and boats
rated for outboard motors of 2 horsepower or less.
(a)
The persons capacity in pounds marked on a boat that is rated for
manual propulsion or for motors of 2 horsepower or less must not
exceed:
(1)
For boats rated for manual propulsion, 90 percent of the maximum
weight capacity in pounds; and
(2)
For boats rated for motors of 2 horsepower or less, 90 percent
of the maximum weight capacity in pounds, less 25 pounds.
(b)
The maximum persons capacity, in whole numbers of persons marked on
a boat that is rated for manual propulsion must not exceed the value
obtained by adding 32 pounds to the value determined in paragraph
(a)(1), dividing the sum by 141, and rounding off the result to the
nearest whole number. If the fraction is less than onehalf, round
down to the next lower integer and if the fraction is equal to or
greater than onehalf, round up to the next higher whole integer.
(c)
The maximum persons capacity in whole numbers of persons marked on a
boat rated for motors of 2 horsepower or less must not exceed the
value obtained by adding 32 pounds to the value determined in
paragraph (a)(2), dividing the sum by 141, and rounding off the
result to the nearest whole number. If the fraction is less than
onehalf, round down to the next lower whole integer and if the
fraction is equal to or greater than onehalf, round up to the next
higher whole integer.
[CGD 78034,
45 FR 2031, Jan. 10, 1980]
