# 69.157 Definitions.
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:
(a) Is continuous athwartships and in a fore-and-aft direction at least between peak bulkheads, even though the deck may have interruptions or openings due to propelling machinery spaces, to hatch and ventilation trunks not extending longitudinally completely between main transverse bulkheads, to ladder and stairway openings, to chain lockers, or to cofferdams.
(b) Is fitted as an integral and permanent part of the vessel.
(c) Has proper covers to all main hatchways.
(d) Does not have steps the total of which exceed 48 inches in height.
*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).
[CGD 87-015b, 54 FR 37657, Sept. 12, 1989, as amended by USCG-2011-0522, 81 FR 18731, Mar. 31, 2016]