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A single white light on a boat means the boat is moving.
A white light on a powerboat (that obviously doesn't have a mast) must be displayed so as to be visible from 360 degrees.
The green light would be located on the right, or starboard, side of the boat.
Turn on an all-around white light when anchoring your boat.
The red light means you are seeing the port side. The white light is shown at the top of the mast, (or is visible from 360 degrees on a power boat). While the starboard green light is not visible being hidden from view by the boat's hull. Therefore, it is likely that the boat in front is moving from right to left across your course. I would turn to my starboard a little to pass astern of the boat in front.
The green light would be located on the right, or starboard, side of the boat.
That a power driven ship is headed right for you. The green and red lights are the navigational side lanterns and the white light is the top light.
Red light means the Port side of the boat. Port side is the left side. The white light is lighting indicating the stern (back) . The white light when seen alone means the boat is anchored. There is also a green light on the Starboard side (right side)
It is white.
a boat is approaching you head-on
Boat under steam
Small boat light.