1. Definition The term “height above the hull” means height above the uppermost continuous deck. This height shall be measured from the position vertically beneath the location of the light.  2. Vertical positioning and spacing of lights On a power-driven vessel of 20 metres or more in length the masthead lights shall be placed as follows: The forward masthead light, or if only one masthead light is carried, then that light, at a height above the hull of not less than 6 metres, and, if the breadth of the vessel exceeds 6 metres, then at a height above the hull not less … [Read more...]