(a) A sailing vessel underway shall exhibit:
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(i) sidelights;
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(ii) a sternlight.
(b) In a sailing vessel of less than 20 metres
in length the lights prescribed in paragraph (a) of this Rule may
be combined in one lantern carried at or near the top of the mast
where it can best be seen.
(c) A sailing vessel underway may, in addition
to the lights prescribed in paragraph (a) of this Rule, exhibit at
or near the top of the mast, where they can best be seen, two all-round
lights in a vertical line, the upper being red and the lower green,
but these lights shall not be exhibited in conjunction with the combined
lantern permitted by paragraph (b) of this Rule.
(d)
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(i) A sailing vessel of less than 7 metres in
length shall, if practicable, exhibit the lights prescribed in paragraph
(a) or (b) of this Rule, but if she does not, she shall have ready
at hand an electric torch or lighted lantern showing a white light
which shall be exhibited in sufficient time to prevent collision.
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(ii) A vessel under oars may exhibit the lights
prescribed in this Rule for sailing vessels, but if she does not,
she shall have ready at hand an electric torch or lighted lantern
showing a white light which shall be exhibited in sufficient time
to prevent collision.
(e) A vessel proceeding under sail when also being
propelled by machinery shall exhibit forward where it can best be
seen a conical shape, apex downwards.