All Round White Light:
A white light showing an unbroken light over an arc of the horizon of 360°.
Masthead Light:
A white light placed over the fore and aft centreline of a vessel, showing an unbroken light over an arc of the horizon of 225° and fixed to show from anywhere ahead, to just behind the beams of the vessel.
Sternlight:
A white light placed near the stern, showing an unbroken light over an arc of the horizon of 135°, fixed
to show from behind the vessel
Sidelights:
A green light on the starboard (right) side, and a red light on the port (left) side of a vessel. Each shows an unbroken light over an arc of the horizon of 112.5°, and is fixed to show from ahead to just behind the beams of the vessel on its respective side.
On a vessel of less than 20 metres in length, the sidelights may be combined in one light unit, carried on the fore and aft centreline of the vessel.
