Page 161 - Collision Avoidance Rules Guide

No other lights
A vessel of 100 metres or more in length is required to use the avail-
able working or equivalent lights to illuminate her decks when at
anchor, by Rule 30(c), and a smaller vessel at anchor may use such
lights. When weighing anchor the deck lights must be switched off,
with the anchor lights, as soon as the anchor is out of the ground.
In the following extract from the judgment in the case of Tojo
Muru-Fina Ztulia reference is made to Rule l(b) of the 1954
Regulations which was almost identical to Rule 20(b) of the 1972
Regulations:
In my view the lights which the Fina Ztalia was exhibiting offended against
that Rule in more than one respect. I received the impression from the
evidence given. . . that it was not altogether unknown for tankers underway
off Kuwait to be manceuvring with their deck lights burning. If there is any
such habit in the port of Kuwait, I can only say that the sooner it is discon-
tinued the better, because it is bound to increase the difficulty of
navigation for other vessels. (Lord Justice Willmer, 1968)

Restricted visibility
The prescribed lights, if carried, must also be exhibited in restricted
visibility from sunrise to sunset. The words ‘if camed’ are included
as some vessels, such as ferries, are not fitted with navigation lights
as their operations are restricted to daylight hours.

BY day
Shapes must be exhibited by day, not merely from sunrise to sunset.
A vessel required to show a day signal should exhibit both lights and
shape(s) during the period of twilight.

RULE 21
Definitions
(a) ‘Masthead light’ means a white light placed over the fore and
aft centreline 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.
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