You are following a pair of leading marks into harbour. The front (lower) mark has moved to the left of the rear one. Which way do you turn to get back on the line?
The view from your boat towards the shore. Two beacons with red and white triangles: the front one low down on the beach, the rear one higher up the hill behind. The front beacon appears to the left of the rear beacon.
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To port, towards the front mark. When two marks are in line (in transit) you are on the line through them. When they open, steer towards the front mark. Here it sits to the left, which means you have drifted to the right of the line, so come to port.
