Page 162 - Collision Avoidance Rules Guide

(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 metres
in length the sidelights may be combined in one lantern car-
ried on the fore and aft centreline of the vessel.
(c) ‘Sternlight’ means a white light placed as nearly as practi-
cable 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 charac-
teristics 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.

COMMENT:
The main specifications of each type of light with regard to general
position on the vessel, colour and arc of visibility are given in these
definitions so as to avoid repetition in subsequent Rules. More
detailed requirements concerning the position and characteristics of
lights and shapes are given in Annex I.

Masthead light
This definition corresponds closely to the requirements of Rule
2(a)(i) of the 1960 Regulations. Although the term ‘masthead light’
is used the text does not specifically require the light to be placed on
a mast. Annex I.2(f) states that masthead lights shall be so placed as
to be above and clear of all other lights and obstructions.

Sidelights
The characteristics of sidelights given in Rules 2(a)(iv-v) and 7(a)(ii)
of the 1960 Regulations are incorporated in this definition. Sidelights
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