Section 312(1)(c) in The Merchant Shipping Act, 1958
(c)the ship is marked on each side with a mark (hereafter in this Act referred to as a deck line) indicating the position of the uppermost complete deck as defined by the load line rules and with marks (hereafter in this Act referred to as load lines) indicating the several maximum depths to which the ship can be safely loaded in various circumstances prescribed by the load line rules;