Lights and Dayshapes

Lights and Dayshapes - Lesson 21 Lights and Day Shapes...

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Lesson 21: Lights and Day Shapes
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LEARNING OBJECTIVES The student will know the lights and day shapes required to be shown by the different types and classes of vessels operating in: Waters where the International "Collision Regulations" apply. Waters covered by the Inland Rules of the United States. The student will know the various signals which may be used in inland or international waters by vessels to indicate they are in distress and require assistance.
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LIGHTS AND SHAPES Rule 20: Application Rules concerning lights shall be complied with from sunset to sunrise, and during such times no other lights shall be exhibited, except such lights as cannot be mistaken for the lights specified in these rules or do not impair their visibility or distinctive character, or interfere with the keeping of a proper look-out.
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Rule 21: Definitions Masthead light: a white light placed over the fore and aft centerline showing an unbroken light over an arc of the horizon of 225° and so fixed as to show the light from right ahead to 22.5° abaft the beam on either side of the vessel. Sidelights: 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° and so fixed as to show the light from right ahead to 22.5° abaft the beam on its respective side. In a vessel of <20m the sidelights may be combined in one lantern carried on the fore and aft centerline
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Arcs of Visibility
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Definitions (cont.) Sternlight: a white light placed as nearly as practicable at the stern showing an unbroken light over an arc of the horizon of 135° and so fixed as to show the light 67.5° from right aft on each side of the vessel. Towing light: a yellow light having the same characteristics as a stern light. All-round light: a light showing an unbroken light over an arc of the horizon of 360°. Flashing light: a light flashing at regular intervals at a frequency of 120 flashes or more per minute.
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Rule 22: Visibility of Lights Min Ranges TYPE OF LIGHT COLOR >50m 12-50m <12m Masthead white 6nm 5nm* 2nm Sidelight red/green 3nm 2nm 1nm Sternlight white 3nm 2nm 2nm Towing yellow 3nm 2nm 2nm All around various 3nm 2nm 2nm * 3nm in vessels of <20m In inconspicuous, partly submerged vessels or objects being towed, a white all-round light with 3nm visibility.
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Rule 23: Power-driven Vessels Underway Shall exhibit: A masthead light forward A second masthead light abaft of and higher than the forward one (>50m) Sidelights Sternlight An air-cushion vessel when operating in the non- displacement mode shall exhibit an all-round flashing yellow light as well If <12m in length may instead exhibit an all-round white light and sidelights If <7m and whose maximum speed does not exceed 7kts is only required to exhibit sidelights if practicable
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Rule 24: Towing and Pushing A power-driven vessel when towing shall exhibit: Instead of the lights defined in Rule 23, two masthead lights in a vertical line.
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  • Spring '14
  • 1m, vessel, Traffic light, 1Nm

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