Seaman's Handbook

PART C. Lights and Shapes : Power-driven vessels underway

(a) A power-driven vessel underway shall exhibit;
  1. a masthead light forward;
  2. a second masthead light abaft and higher than the forward one; except that a vessel of
    less than 50m in length shall not be obliged to exhibit such light but may do so;
  3. sidelights;
  4. a sternlight.
(b) An air-cushion vessel operating in the non-displacement mode shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit an all-round flashing yellow light.(c) A WIG craft only when taking off, landing and in flight near the surface shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit a high intensity all round flashing red light.
  1. A power-driven vessel of less that 12 metres in length may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and sidelights;
  2. a power-driven vessel of less than 7 metres in length whose maximum speed does not exceed 7 knots may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and shall, if practicable, also exhibit sidelights;
  3. The masthead light or all-round white light on a power-driven vessel of less than 12
    metres in length may be displaced from the fore and aft centreline of the vessel if
    centreline fitting is not practicable, provided that the sidelights are combined in one
    lantern which shall be carried on the fore and aft centreline of the vessel or located as
    nearly as practicable in the same fore and aft line as the masthead light or the all-round
    white light.