This power-driven vessel is towing another vessel astern. What do the two white lights in a vertical line tell you?
Lights seen at night, from top to bottom: white (centre), white (centre), green (left), red (right).
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The tow is 200 metres long or less. A vessel towing astern shows two masthead lights in a vertical line when the tow is 200 metres or less, and three when it is longer. Look out for the tow behind her, and never pass between them.
