33 C.F.R. § 401.6
(c) Where a vessel's bulbous bow extends forward beyond her stem head, a symbol of a bulbous bow shall be marked above the vessel's summer load line draught mark in addition to a + symbol followed by a number indicating the total length in meters by which the bulbous bow projects beyond the stem.
(68 Stat. 93-96, 33 U.S.C. 981-990, as amended and secs. 4, 5, 6, 7, 8, 12 and 13 of sec. 2 of Pub. L. 95-474, 92 Stat. 1471)
[47 FR 51121, Nov. 12, 1982, as amended at 61 FR 19551, May 2, 1996; 70 FR 12970, Mar. 17, 2005]