If a vessel of length 20metres or more is required by the rules to carry two or three lights in a vertical line, at what height above the hull (except where a towing light is required) must the lowest of these be placed?
If a vessel of length 20metres or more is required by the rules to carry two or three lights in a vertical line, at what height above the hull (except where a towing light is required) must the lowest of these be placed?
