1. Single motorized vessels shall carry:
(a) A masthead light forward and in the axis of the vessel, at a height of not less than 5 m. The height may be reduced to 4 m, when the vessel does not exceed a length of 40 m;
(b) Side lights, each placed at the same height and on the same perpendicular to the axis of the vessel, 1 m lower than the masthead light, at least 1 m abaft of it on the widest part of the vessel; they shall be screened inboard so that the green light cannot be seen from the port side and the red light cannot be seen from the starboard side;
(c) A stern light, placed aft and in the axis of the vessel.
2. A single motorized vessel more than 110 m long shall be required to carry by night at the stern a second masthead light placed in the axis of the vessel and at least 3 m higher than the forward light.
3. A single motorized vessel temporarily preceded by night by an auxiliary motorized vessel shall continue to show the lights referred to in paragraphs 1 and 2 above.
two strong yellow quick scintillating lights.
These scintillating lights shall be placed one above the other about 1 m apart, in a suitable position and high enough to be visible from all directions.