COLREG Annex I – Positioning and Technical Details of Lights and Shapes – Set A
Source: Convention on the International Regulations for Preventing Collisions at Sea, 1972 (COLREG), Annex I – Positioning and Technical Details of Lights and Shapes.
Reference: imorules.com – COLREG Annex I
Question 4 of 10
4. When two masthead lights are carried, the after one shall be vertically higher than the forward one by at least: