(1) Subject to subsection ( 2), the length overall of a vessel is 110% of the length as shown on the vessel ' s load line certification.
(2) If the length overall of a vessel cannot be worked out under subsection ( 1), the length overall is taken to be the distance between:
(a) a vertical line passing through a point that is the foremost part of the bow ; and
(b) a vertical line passing through a point that is the aftermost part of the stern.