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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. 84.01—Definitions
(a) The term height above the hull means height
above the uppermost continuous deck. This height shall be
measured from the position vertically beneath the location
of the light.
(b) High-speed craft means a craft capable of
maximum speed in meters per second (m/s) equal to or exceeding:
3.7 
0.1667; where =
displacement corresponding to the design waterline (meters3).
Note to paragraph (b):
The same formula expressed in pounds and knots is maximum
speed in knots (kts) equal to exceeding 1.98 (lbs)
0.1667; where
= displacement corresponding to design waterline in pounds.
(c) The term practical cut-off means, for vessels
20 meters or more in length, 12.5 percent of the minimum luminous
intensity (Table 84.15(b)) corresponding to the greatest range
of visibility for which the requirements of Annex I are met.
(d) The term Rule or Rules means the Inland
Navigation Rules contained in sec. 2 of the Inland Navigational
Rules Act of 1980 (Pub. L. 96-591, 94 Stat. 3415, 33 U.S.C.
2001, December 24, 1980) as amended.
[CGD 81-008, 46 FR 62447, Dec. 24, 1981,
as amended by CGD 94-011, 63 FR 5731, Feb. 4, 1998]
Sec. 84.03—Vertical positioning and
spacing of lights
(a) On a power-driven vessel of 20 meters or
more in length the masthead lights shall be placed as follows:
(1) The forward masthead light, or if
only one masthead light is carried, then that light, at
a height above the hull of not less than 5 meters, and,
if the breadth of the vessel exceeds 5 meters, then at a
height above the hull not less than such breadth, so however
that the light need not be placed at a greater height above
the hull than 8 meters;
(2) When two masthead lights are carried
the after one shall be at least 2 meters vertically higher
than the forward one.
(b) The vertical separation of the masthead
lights of power-driven vessels shall be such that in all normal
conditions of trim the after light will be seen over and separate
from the forward light at a distance of 1000 meters from the
stem when viewed from water level.
(c) The masthead light of a power-driven vessel
of 12 meters but less than 20 meters in length shall be placed
at a height above the gunwale of not less than 2.5 meters.
(d) The masthead light, or the all-round light
described in Rule 23(c), of a power-driven vessel of less
than 12 meters in length shall be carried at least one meter
higher than the sidelights.
(e) One of the two or three masthead lights
prescribed for a power-driven vessel when engaged in towing
or pushing another vessel shall be placed in the same position
as either the forward masthead light or the after masthead
light, provided that the lowest after masthead light shall
be at least 2 meters vertically higher than the highest forward
masthead light.
(f)
(1) The masthead light or lights prescribed
in Rule 23(a) shall be so placed as to be above and clear
of all other lights and obstructions except as described
in paragraph (f)(2) of this section.
(2) When it is impracticable to carry the
all-round lights prescribed in Rule 27(b)(i) below the masthead
lights, they may be carried above the after masthead light(s)
or vertically in between the forward masthead light(s) and
after masthead light(s), provided that in the latter case
the requirement of Sec. 84.05(d) shall be complied with.
(g) The sidelights of a power-driven vessel
shall be placed at least one meter lower than the forward
masthead light. They shall not be so low as to be interfered
with by deck lights.
(h) [Reserved]
(i) When the Rules prescribe two or three lights
to be carried in a vertical line, they shall be spaced as
follows:
(1) On a vessel of 20 meters in length or
more such lights shall be spaced not less than 1 meter apart,
and the lowest of these lights shall, except where a towing
light is required, be placed at a height of not less than
4 meters above the hull;
(2) On a vessel of less than 20 meters in
length such lights shall be spaced not less than 1 meter
apart and the lowest of these lights shall, except where
a towing light is required, be placed at a height of not
less than 2 meters above the gunwale;
(3) When three lights are carried they shall
be equally spaced.
(j) The lower of the two all-round lights prescribed
for a vessel when engaged in fishing shall be a height above
the sidelights not less than twice the distance between the
two vertical lights.
(k) The forward anchor light prescribed in Rule
30(a)(i), when two are carried, shall not be less than 4.5
meters above the after one. On a vessel of 50 meters or more
in length this forward anchor light shall be placed at a height
or not less than 6 meters above the hull.
[CGD 81-008, 46 FR 62447, Dec. 24, 1981,
as amended by CGD 89-024, 55 FR 3947, Feb. 6, 1990]
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