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Basic navigation lights

Sailing School app https://apps.apple.com/app/sailing-sc... According to the International Regulations of Preventing Collisions at Sea (ColReg), navigation lights have a specific color (white, red, green, yellow or blue), arc of illumination, range of visibility and location. The basic navigation lights are: The masthead light is a white light, placed over the fore-and after-centerline of the vessel and that is visible over a 225°arc. From dead ahead to 22.5° abaft (behind) the beam on both sides of the vessel. The All-round light is a light, with the color determined by its use and is visible over a 360° arc. The sidelights are colored lights - red on port and green on the starboard side of the boat and is visible over a 112.5° arc, from dead ahead to 22.5° abaft the beam on each side. The stern light is a white light, centered on dead astern, and is visible over a 135° arc. The side lights can be combined in one lantern at the bow. The sidelights can be combined with the stern light in a tricolour light at the masthead. The towing light, is a yellow light and is used in a towing operation. Centered on dead astern vertically above the stern light and is visible over a 135° arc. The flashing light is a yellow or blue flashing light with minimum 120 flashes per minute and is visible over a 360° arc.