Red-white-red in a vertical line, with a white masthead light and a green sidelight. What is it?
Lights seen at night, from top to bottom: white (right), red (centre), white (centre), red (centre), green (right).
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A vessel restricted in her ability to manoeuvre, making way, starboard side towards you. Red-white-red means restricted in her ability to manoeuvre. When she is making way she adds her masthead light, sidelights and sternlight, so the green tells you she is moving and you can see her starboard side.
