33 CFR 84.17 - Horizontal sectors.

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§ 84.17 Horizontal sectors.
(a)
(1) In the forward direction, sidelights as fitted on the vessel shall show the minimum required intensities. The intensities shall decrease to reach practical cut-off between 1 and 3 degrees outside the prescribed sectors.
(2) For sternlights and masthead lights and at 22.5 degrees abaft the beam for sidelights, the minimum required intensities shall be maintained over the arc of the horizon up to 5 degrees within the limits of the sectors prescribed in Rule 21. From 5 degrees within the prescribed sectors the intensity may decrease by 50 percent up to the prescribed limits; it shall decrease steadily to reach practical cut-off at not more than 5 degrees outside the prescribed sectors.
(b) All-round lights shall be so located as not to be obscured by masts, topmasts or structures within angular sectors of more than 6 degrees, except anchor lights prescribed in Rule 30, which need not be placed at an impracticable height above the hull, and the all-round white light described in Rule 23(d), which may not be obscured at all.
(c) If it is impracticable to comply with paragraph (b) of this section by exhibiting only one all-round light, two all-round lights shall be used suitably positioned or screened to appear, as far as practicable, as one light at a minimum distance of one nautical mile.
Note to paragraph (c):
Two unscreened all-round lights that are 1.28 meters apart or less will appear as one light to the naked eye at a distance of one nautical mile.
[CGD 81-008, 46 FR 62447, Dec. 24, 1981, as amended by CGD 94-011, 63 FR 5731, Feb. 4, 1998; USCG-2012-0306, 77 FR 37313, June 21, 2012]

Title 33 published on 2013-07-01

The following are only the Rules published in the Federal Register after the published date of Title 33.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-07-07; vol. 79 # 129 - Monday, July 7, 2014
    1. 79 FR 38422 - Navigation and Navigable Waters; Technical, Organizational, and Conforming Amendments
      GPO FDSys XML | Text
      DEPARTMENT OF HOMELAND SECURITY, Coast Guard
      Final rule.
      This final rule is effective July 7, 2014.
      33 CFR Parts 1, 3, 8, 13, 19, 23, 25, 26, 27, 51, 52, 67, 80, 81, 84, 89, 96, 104, 105, 110, 114, 116, 117, 118, 120, 126, 127, 128, 135, 140, 141, 144, 148, 151, 153, 154, 155, 156, 157, 158, 159, 160, 161, 164, 165, 167, 169, 174, 179, 181, and 183

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United States Code
U.S. Code: Title 33 - NAVIGATION AND NAVIGABLE WATERS

Title 33 published on 2013-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 33 CFR 84 after this date.

  • 2014-07-07; vol. 79 # 129 - Monday, July 7, 2014
    1. 79 FR 38422 - Navigation and Navigable Waters; Technical, Organizational, and Conforming Amendments
      GPO FDSys XML | Text
      DEPARTMENT OF HOMELAND SECURITY, Coast Guard
      Final rule.
      This final rule is effective July 7, 2014.
      33 CFR Parts 1, 3, 8, 13, 19, 23, 25, 26, 27, 51, 52, 67, 80, 81, 84, 89, 96, 104, 105, 110, 114, 116, 117, 118, 120, 126, 127, 128, 135, 140, 141, 144, 148, 151, 153, 154, 155, 156, 157, 158, 159, 160, 161, 164, 165, 167, 169, 174, 179, 181, and 183