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• Side Lights: These are the red and green lights on a vessel's side that are visible to another boat approaching from either the side or head-on. The red light is on the port (left) side and the green light is on the starboard (right) side with each showing a unbroken light over an arc of the horizon of 112.5 degrees and so fixed as to show the light from right ahead to 22.5 degrees abaft the beam on its respective side. In a vessel of less than 30 meters in length the sidelights may be combined in one lantern carried on the fore and aft centerline of the vessel.  

• Stern Light: As the name implies this white light is only seen from behind, or nearly behind the vessel. It is placed as near as practical at the stern showing an unbroken light over an arc of the horizon of 135 degrees and so fixed as to show the light 67.5 degrees from right aft on each side of the vessel. 

• Masthead Light: This white light shines both forward and on the sides. It is located on the mast of a sailboat, usually at or near the top, and is required on all powerboats. Any boat, including sailboats, must have a masthead light on when operating under engine power. The absence of this light on a sailboat means it is under sail. It is placed over the fore and aft centerline of the vessel showing an unbroken light over an arc of the horizon of 225 degrees and so fixed as to show the light from right ahead to 22.5 degrees abaft the beam on either side of the vessel. 

• White Light: On powerboats less than 39.4 feet in length, this light may be used to combine a masthead and stern light into a single white light able to be seen by other boats for all directions. The all-around white light can be used as an anchor light when the sidelights are off.

• Note: A power-driven vessel of less than 12 meters in length may exhibit an all around white light and side lights.  
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