You are entering a harbour at night in IALA Region A (the UK and Europe) and see this flashing red light on a buoy ahead. Which side do you leave it?
Night, looking into a harbour entrance between two dark headlands with a few dim shore lights. Low on the water in the middle is a single red light. Caption: a buoy ahead, flashing red.
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To port: keep it on your left. Lateral marks keep their colours at night. Coming in from seaward in Region A, red lights mark the port side of the channel and green lights the starboard side.
