22.21 Definitions relating to Section 2
Maritime Rules Part 22: Collision Prevention
In this section—
all-round light means a light showing an unbroken arc over the horizon of 360 degrees:
flashing light means a light flashing at regular intervals at a frequency of 120 flashes or more per minute:
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 fixed to show the light from right ahead to 22.5 degrees (2 points) abaft the beam on both sides of the vessel:
sidelights means a green light on the starboard side and a red light on the port side each showing an unbroken light over an arc of the horizon of 112.5 degrees and fixed to show the light from right ahead to 22.5 degrees (2 points) abaft the beam on its respective side.
In a vessel of less than 20 metres in length the sidelights may be combined in one lantern carried on the fore and aft centreline of the vessel:
sternlight means a white light placed as close as practicable to the stern showing an unbroken light over an arc of the horizon of 135 degrees and so fixed to show the light from right aft for 67.5 degrees (6 points) on both sides of the vessel:
towing light means a yellow light having the same characteristics as the sternlight.