(a) On a power-driven vessel of 20 metres or more
in length the masthead lights shall be placed as follows:
-
(i) 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 6 metres, and, if the breadth of the vessel
exceeds 6 metres, 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 12 metres;
-
(ii) when two masthead lights are carried the
after one shall be at least 4.5 metres vertically higher than the
forward one.
(b) The vertical separation of 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 metres from the stem when viewed from
sea-level.
(c) The masthead light of a power-driven vessel
of 12 metres but less than 20 metres in length shall be placed at
a height above the gunwale of not less than 2.5 metres.
(d) A power-driven vessel of less than 12 metres
in length may carry the uppermost light at a height of less than 2.5
metres above the gunwale. When however a masthead light is carried
in addition to sidelights and a sternlight or the all-round light
prescribed in Rule 23(c)(i) is
carried in addition to sidelights, then such masthead light or all-round
light shall be carried at least 1 metre 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, if carried
on the aftermast, the lowest after masthead light shall be at least
4.5 metres vertically higher than the forward masthead light.
(f)
-
(i) 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 subparagraph (ii).
-
(ii) When it is impracticable to carry the all-round
lights prescribed by Rule 27(b)(i) or Rule 28 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 section 3(c) of this Annex shall be
complied with.
(g) The sidelights of a power-driven vessel shall
be placed at a height above the hull not greater than three quarters
of that of the forward masthead light. They shall not be so low as
to be interfered with by deck lights.
(h) The sidelights, if in a combined lantern and
carried on a power-driven vessel of less than 20 metres in length,
shall be placed not less than 1 metre below the masthead light.
(i) When the Rules prescribe two or three lights
to be carried in a vertical line, they shall be spaced as follows:
-
(i) on a vessel of 20 metres in length or more
such lights shall be spaced not less than 2 metres 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 metres above the hull;
-
(ii) on a vessel of less than 20 metres in length
such lights shall be spaced not less than 1 metre 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 metres above the gunwale;
-
(iii) 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 at 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 metres above the after one. On a vessel
of 50 metres or more in length this forward anchor light shall be
placed at a height of not less than 6 metres above the hull.