Terms used in this subpart that are defined in § 69.103 have the same meaning as in § 69.103 , except the terms listed below. As used in this subpart,-
Gross register tonnage is defined in § 69.161(a) .
Line for fresh and tropical waters means the line described in § 69.177(b)(2) .
Line of the second deck means the line described in § 69.181 .
Line of the uppermost complete deck means a longitudinal line at the underside of the uppermost complete deck or, if that deck is stepped, the longitudinal line of the underside of the lowest portion of that deck parallel with the upper portions of that deck.
Net register tonnage is defined in § 69.161(b) .
Second deck means the next deck below the uppermost complete deck that meets the following:
Tonnage deck means, for a vessel with only one deck, the uppermost complete deck and, for a vessel with a second deck, the second deck.
Tonnage mark means the line described in § 69.177(a)(2) .
46 C.F.R. §69.157