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 5 of 10
5. The vertical separation of masthead lights must be such that the after light is seen over and separate from the forward light, when viewed from sea-level, at a distance from the stem of: