Sail Skills - ColRegs Free Guide to ColRegs (the International Regulations for Preventing Collisions at Sea, the IRPCS or Collision Regs). Guidance covers all aspects with animations, pictures and diagrams. Aimed at small vessel users but suitable for professional mariners. Especially recommended for RYA examination candidates.
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back to top ColRegs Home>ColRegs>Restricted Visibility>Note: Detecting at Night View ahead from a small boat showing other vessels' lights and a light on a headland View ahead from a small boat showing other vessels and a headland In deteriorating visibility: dimmer and more distant lights become indistinct or obscured other lights often develop a “halo” or blurring searchlight or lighthouse beams become more obvious: View ahead from a small boat showing a headland In the absence of other lights, deterioration is often first indicated by “backscatter” Backscatter is the vessel’s own lights being reflected from particles in the air This is shown in the next 2 pictures: View ahead from a small boat showing severe backscatter from sidelights View ahead from a small boat showing other vessels' lights and a light on a headland in restricted visibility
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