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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ColRegs Home>ColRegs>Lights & Shapes>Lights General Diagram: Plan of a vessel showing arcs of lights Arcs of Lights Diagram: lights of a power-driven vessel underway seen through binoculars Range of Lights Lights - power-driven vessel underway from ahead Lights General Rule 21 Lights General The rules define lights: masthead sidelight sternlight all-round flashing Masthead Light Is visible from right ahead to 22.5° abaft the beam on each side. It is white back to top Royal Fleet Auxiliary showing masthead lights Sidelights Are visible from right ahead to 22.5° abaft the beam on their respective sides. They are: red to port green to starboard Royal Fleet Auxiliary showing masthead lights and sidelights Sternlight Is visible from right astern to 22.5° abaft the beam on each side. It is white Royal Fleet Auxiliary Showing Sternlight Arcs of Visibility Mean the: sternlight is only visible by itself masthead and sidelights have the same overall arc of visibility Flashing A light flashing at regular intervals at a frequency of 120 flashes or more per minute This “light” flashes at more than 120 flashes per minute Vessel showing lights restricted ability manoeuvre - not making way All-Round Light Shows an unbroken light over an “arc of the horizon” of 360° All-round lights are used in variety of combinations and colours to identify a vessel For example: vessel restricted in ability to manoeuvre and not making way:
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