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---------ABOUT THE VIDEO---------
This video was originally uploaded to our other channel, Casual Navigation, back in 2018.
This video is an "in depth" look at Rule 21 of the International Regulations for Preventing Collisions at Sea. Rule 21 is the start of the section that covers Light and Shapes of different vessels. This rule defines what is meant by the terms Masthead Light, Sidelight, Sternlight, Towing Light, All Round Light and Flashing Light.
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Rule 21: Definitions
(a) “Masthead light” means a white light placed over the fore and aft centreline of the vessel showing an unbroken light over an arc of the horizon of 225 degrees and so fixed as to show the light from right ahead to 22.5 degrees abaft the beam on either side of the vessel.
(b) “Sidelights” means a green light on the starboard side and a red light on the port side each showing an unbroken light over an arc of the horizon of 112.5 degrees and so fixed as to show the light from the right ahead to 22.5 degrees abaft the beam on its respective side. In a vessel of less than 20 metres in length the sidelights may be combined in one lantern carried on the fore and aft centreline of the vessel.
(c) “Sternlight” means a white light placed as nearly as practicable at the stern showing an unbroken light over an arc of the horizon of 135 degrees and so fixed as to show the light 67.5 degrees from right aft on each side of the vessel.
(d) “Towing light” means a yellow light having the same characteristics as the “sternlight” defined in paragraph (c) of this Rule.
(e) “All-round light” means a light showing an unbroken light over an arc of the horizon of 360 degrees.
(f) “Flashing light” means a light flashing at regular intervals at a frequency of 120 flashes or more per minute.
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