The load line mark shall consist of a ring 300 mm in outside
diameter and 25 mm wide which is intersected by a horizontal line
450 mm in length and 25 mm in breadth, the upper edge of which passes
through the centre of the ring. The centre of the ring shall be placed
amidships and at a distance equal to the assigned summer freeboard
measured vertically below the upper edge of the deck line (as illustrated
in figure 6.1).