RULE 21:
DEFINITIONS
(a)
"Masthead light" means a white light placed over
the fore and aft centerline 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, except that on a vessel of less than 12 meters
in length the masthead light shall be placed as nearly as practicable
to the fore and aft centerline of the vessel. [Inld]
(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 right ahead to 22.5 degrees abaft the beam on its
respective side. In a vessel of less than 20 meters in length the
sidelights may be combined in one lantern carried on the fore and
aft centerline of the vessel, except that on a vessel of less
than 12 meters in length the sidelights when combined in one lantern
shall be placed as nearly as practicable to the fore and aft centerline
of the vessel. [Inld]
(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.
(g)
"Special flashing light" means a yellow
light flashing at regular intervals at a frequency of 50 to 70 flashes
per minute, placed as far forward and as nearly as practicable on
the fore and aft centerline of the tow and showing an unbroken
light over an arc of the horizon of not less than 180 degrees nor
more than 225 degrees and so fixed as to show the light from right
ahead to abeam and no more than 22.5 degrees abaft the beam on either
side of the vessel. [Inld]
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