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a=Distance from the molded line of second deck to upper edge of tonnage mark. d=Molded draft to upper edge of tonnage mark.

e=Freeboard from loadline certificate. h=Molded draft to loadline.

k=Distance from centerline of loadline disk to apex of triangle on tonnage mark. m=Distance from deck line to tonnage mark. t Distance from molded line of second deck to deck line for freeboard.

§ 2.92 Depth (D) used with the tonnage mark table.

(a) The depth (D) to be used with the tonnage mark table in § 2.95 shall be the molded depth to the second deck.

(b) If the second deck is stepped, an equivalent depth shall be used. (See fig. 57.)

(1) If the higher portion of the deck is less than one-half the total length (L) of both portions, the depth for the table (D) shall be the molded depth amidships (D) increased by the ratio of the length of the shorter portion (I) to the total length (L) times the height of the step (b).

I (D1=D+-b in the upper example in L

fig. 57.)

(2) If the lower portion of the deck is less than one-half the total length (L) of both portions, the depth for the table (D) shall be the molded depth amidships (D) decreased by the ratio of the length of the shorter portion (I) to the total length (L) times the height of the step (b).

I

(D ̧=D——b in the lower example in L

§ 2.93

fig. 57.)

Length (L) used in the tonnage mark table.

(a) The length (L) as used in the tonnage mark table shall be the distance on the second deck between two points, of which the foremost is the point where the underside of that deck or the line thereof at the stem, meets the inner surface of the ceiling, sparring or frames, and the aftermost is the point where the underside of that deck, or the line thereof, meets the inner surface of the ceiling, sparring or frames in the middle plane at the stern.

(b) If the second deck is stepped, an equivalent length (L) shall be measured along an equivalent of the molded line parallel to the second deck and passing through the upper terminal of the depth (Ds). (See fig. 57.)

§ 2.94

Figures in the tonnage mark table.

(a) The figures in the tonnage mark table in § 2.95 show the minimum distance from the molded line of the second deck or, if the deck is stepped from the equivalent of the molded line as set out in § 2.93(b), to the upper edge of the tonnage mark.

(b) The tonnage mark table is given for the whole number ratios L1/Dg from 12 to 20, where D, and L are the depth and length as set out in §§ 2.92 and 2.93 and for lengths up to 800 feet at intervals of 10 feet.

(c) For intermediate

S

lengths and L/D ratios, the corresponding distances shall be obtained by linear interpolation. For other cases the distances shall be obtained by extrapolation.

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§ 2.95 Tonnage mark table.

(a) Minimum distance from the molded line of the second deck to the upper edge of the tonnage mark.

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§ 2.96

Line of the second deck.

No line of the second deck shall be marked on the side of the vessel.

§ 2.97 Line of the uppermost complete deck.

(a) For a vessel having no statutory loadline, the line of the uppermost complete deck shall be marked similarly to the deck line provided by the Load Line Convention.

(b) The deck line shall be a horizontal line 12 inches long and 1 inch wide. It shall be marked abaft amidships above the place on each side of the vessel prescribed in § 2.90 for the tonnage mark. Its upper edge shall pass through the point where the continuation outward of the upper surface of the freeboard deck intersects the outer surface of the shell. (See fig. 58.) Where the deck is partly sheathed amidships, the upper edge of the deck line shall pass through the point where the continuation outward of the upper surface of the actual sheathing at amidships intersects the outer surface of the shell.

§ 2.98 Placing the tonnage mark in relation to the deck line.

(a) As a practical matter, since the molded line of the second deck is not to be marked on the side of the vessel, the position of the tonnage mark shall be determined by reference to the deck line for freeboard or, in the absence of such a line, with reference to the deck line provided by § 2.97.

(b) The upper edge of the tonnage mark shall be below the upper edge of the deck line, a distance equivalent to the sum of the vertical distance (determined by reference to the tonnage mark table) from the molded line of the second deck or equivalent to the upper edge of the tonnage mark plus the vertical distance from the molded line of the second deck or equivalent to the upper edge of the deck line. (See in figs. 55 and 56, a+t=m.)

(c) In the case of a vessel for which it is desired to have only one set of tonnages, the tonnage mark shall be placed at the level of the uppermost part of the loadline grid as provided by § 2.91(b). (See fig. 56.)

§ 2.99 Application for measurement according to the optional dual-tonnage method.

(a) Application of the owner or his agent for measurement of a vessel under the provisions of the optional dual tonnage method shall be submitted in duplicate together with supporting plans or sketches to the customs officer in charge of the district in which the vessel is or will be located.

FIGURE 58.-Deck line-12 inches x 1 inch

(b) The application shall include the following information: (See figures 55, 56, and 57.)

(1) Molded depth at midship section from second deck at side.

(2) Depth used with tonnage mark table.

(3) Length of shorter portion of stepped second deck if any.

(4) Total length of longer and shorter portions of stepped second deck.

(5) Length used with tonnage mark table.

(6) Height of step (break) in the second deck, if any.

(7) Distance from the molded line of the second deck or equivalent to the upper edge of the tonnage mark.

(8) Molded draft to the upper edge of the tonnage mark.

(9) Freeboard from the loadline certificate.

(10) Molded draft to the loadline.

(11) Horizontal distance from the centerline of the loadline disk to the apex of the triangle on the tonnage mark.

(12) Vertical distance from the deck line to the tonnage mark.

(13) Vertical distance from the molded line of the second deck or equivalent to the deck line for freeboard.

(14) Allowance for fresh water and tropical waters (48 of the molded draft to the upper edge of the tonnage mark). (15) The name and official number of the vessel, if assigned.

(16) Builder's name and hull number if official number has not been assigned. (17) Time and place vessel will be available for measurement.

(18) Whether two sets of tonnages are desired.

(c) The owner may request confirmation of the proposed location of the tonnage mark based on the information contained in the application.

(d) On a copy of the application or on an attachment thereto, the owner shall be advised:

(1) That the vessel will be measured under the provisions of the optional dual-tonnage method; and

(2) Whether the proposed location of the tonnage mark determined according to the information furnished on the application is correct under the provisions of the regulations.

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(a) Before a certificate of admeasurement shall be issued for a vessel requiring a tonnage mark, the owner or his agent shall certify that a tonnage mark has been placed on each side of the vessel in accordance with the pertinent provisions of the regulations.

(b) A certification by the American Bureau of Shipping or other recognized classification society that the tonnage marks have been placed on the vessel in accordance with the provisions of the regulations shall be accepted as evidence of proper marking.

(c) In the absence of a certification by the American Bureau of Shipping or other recognized classification society, the customs officer in charge may at any time cause a tonnage mark to be verified on a vessel in his district.

OPTIONAL SIMPLIFIED ADMEASUREMENT METHOD FOR PLEASURE VESSELS

§ 2.101 Application for simplified ad

measurement.

(a) Upon application by the owner for simplified admeasurement, filed with and approved by the district director of customs for the district where the vessel is located, a vessel which is intended to be used exclusively for pleasure shall, whether or not it has been previously admeasured, be admeasured in accordance with the provisions of §§ 2.103 and 2.104. The application shall state the owner's name and address, the vessel's name and rig, her overall length, breadth, and depth, as defined in § 2.102, the name of the builder, and the vessel's model, serial, and official number, if any. Where the vessel appears to be subject to admeasurement under the provisions of § 2.103 (b) or (d), or both, the application shall be accompanied by dimensioned sketches, not necessarily to scale of the arrangement, profile, and cross section of the vessel, indicating thereon the points to which the dimensions were taken.

(b) Dimensions shall be stated on the application in feet and inches or in feet and decimal fractions of feet. The register length (L), breadth (B), and depth (D) used in calculating the vessel's tonnages and shown on the vessel's document shall be in feet and decimal fractions of feet.

[T.D. 67-69, 32 F.R. 3389, Mar. 1, 1967] § 2.102

Definition of terms used in §§ 2.101 through 2.105.

(a) "Overall length" means the horizontal distance between the foremost part of the stem and the aftermost part of the stern, excluding bowsprits, bumpkins, rudders, outboard motor brackets, and similar fittings or attachments.

(b) "Overall breadth" is the horizontal distance, excluding rub rails, from the outside of the skin (outside planking or plating) on one side to the outside of the skin on the other, taken at the widest part of the hull.

(c) "Overall depth" is the vertical distance taken at or near midships from a line drawn horizontally through the uppermost edges of the skin at the sides of the hull (excluding the cap rail and trunks, cabins, or deckhouses) to the outboard face of the bottom skin of the hull. This excludes the keel unless the keel is covered by the skin.

(d) Overall length and depth are measured in the vertical plane of the centerline; overall breadth, in a line at right angles to the vertical plane of the centerline.

(e) The overall length, breadth, and depth, as defined in this section, of a vessel measured under the provisions of §§ 2.101 through 2.104 of this part shall be deemed to be the vessel's register length, breadth, and depth.

(f) "Vessel designed for sailing" means a vessel, whether or not equipped with an auxiliary motor, which has the fine lines of a sailing craft and is in fact propelled by sail or capable of being propelled by sail, other than a mere steadying sail.

[T.D. 67-69, 32 F.R. 3389, Mar. 1, 1967]
§ 2.103 Calculation of gross tonnage.

(a) Except as provided in paragraphs (b) and (d) of this section, the gross tonnage of a vessel designed for sailing shall be one-half (LBD/100, and the gross tonnage of a vessel not designed for sailing shall be two-thirds (LBD/100), LBD being the product of overall length, breadth, and depth.

(b) Where a vessel's hull approximates in shape a regular geometric solid, the gross tonnage of the hull shall be her volume as calculated by the use of appropriate geometric formulae, expressed in tons of 100 cubic feet.

(c) The gross tonnage of a catamaran or trimaran shall be arrived at by adding the gross tonnages of her hulls as calculated under this section.

(d) Where the volume of the deckhouse is disproportionate to the volume of the hull, as in the case of certain houseboats, the volume of the deckhouse, calculated by the use of appropriate geometric formulae, expressed in tons of 100 cubic feet, shall be added to the gross tonnage of the hull as previously calculated. [T.D. 67-69, 32 F.R. 3389, Mar. 1, 1967] § 2.104 Calculation of net tonnages.

(a) Except as provided in paragraph (b) of this section, the net tonnage of a vessel designed for sailing shall be ninetenths of her gross tonnage, and the net tonnage of a vessel not designed for sailing shall be eight-tenths of her gross tonnage.

(b) The net tonnage of a vessel which has no propelling machinery in the hull shall be the same as her gross tonnage. [T.D. 67-69, 32 F.R. 3389, Mar. 1, 1967]

§ 2.105 Readmeasurement

of vessels admeasured under §§ 2.101 through 2.104.

(a) A vessel admeasured under the provisions of §§ 2.101 through 2.104 may, upon application by the owner, be readmeasured under the appropriate provisions of §§ 2.11 through 2.100.

(b) A vessel admeasured under the provisions of §§ 2.101 through 2.104 which is thereafter to be documented for use other than exclusively as a pleasure vessel shall be readmeasured under the appropriate provisions of §§ 2.11 through 2.100.

[T.D. 67-69, 32 F.R. 3389, Mar. 1, 1967]

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