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CODE OF FEDERAL REGULATIONS – TITLE
33 – NAVIGATION AND NAVIGABLE WATERS
PART 84—ANNEX I: POSITIONING
AND TECHNICAL DETAILS OF LIGHTS AND SHAPES
Sec. 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): Tow
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]
Sec. 84.19—Vertical sectors
(a) The vertical sectors of electric lights
as fitted, with the exception of lights on sailing vessels
underway and on unmanned barges, shall ensure that:
(1) At least the required minimum intensity
is maintained at all angles from 5 degrees above to 5 degrees
below the horizontal;
(2) At least 60 percent of the required minimum
intensity is maintained from 7.5 degrees above to 7.5 degrees
below the horizontal.
(b) In the case of sailing vessels underway
the vertical sectors of electric lights as fitted shall ensure
that:
(1) At least the required minimum intensity
is maintained at all angles from 5 degrees above to 5 degrees
below the horizontal;
(2) At least 50 percent of the required minimum
intensity is maintained from 25 degrees above to 25 degrees
below the horizontal.
(c) In the case of unmanned barges the minimum
required intensity of electric lights as fitted shall be maintained
on the horizontal.
(d) In the case of lights other than electric
lights these specifications shall be met as closely as possible.
[CGD 81-008, 46 FR 62447, Dec. 24, 1981,
as amended by CGD 89-024, 55 FR 3947, Feb. 6, 1990]
Sec. 84.21—Intensity of non-electric
lights
Non-electric lights shall so far as practicable
comply with the minimum intensities, as specified in the Table
given in Sec. 84.15.
Sec. 84.23—Maneuvering light
Notwithstanding the provisions of Sec. 84.03(f),
the maneuvering light described in Rule 34(b) shall be placed
approximately in the same fore and aft vertical plane as the
masthead light or lights and, where practicable, at a minimum
height of one-half meter vertically above the forward masthead
light, provided that it shall be carried not less than one-half
meter vertically above or below the after masthead light.
On a vessel where only one masthead light is carried the maneuvering
light, if fitted, shall be carried where it can best be seen,
not less than one-half meter vertically apart from the masthead
light.
Sec. 84.25—Approval
The construction of lights and shapes and the
installation of lights on board the vessel must satisfy the
commandant, U.S. Coast Guard.
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