In the second diagram, we see a fleet of Lasers running directly downwind toward a leeward mark. All five boats are on the same tack. We will examine the perils of Pauline. If you draw a line across the aftermost part of her boat at right angles to her centerline, you’ll see that Tom’s bow is ahead of the line, but Dick, Harry, and Lou are all well behind it. If Tom were not in the picture, then Dick, Harry, and Lou would be clear astern of Pauline and she would be under no obligation to give any of them mark-room. However, Tom is present and between Pauline and Dick. Applying the fourth sentence of the definition, at the very moment shown in the diagram, when Pauline’s hull reaches the zone, she is overlapped with Dick because Tom is in the space between her and Dick, and Tom overlaps both of them. Applying the same sentence again, you see that Tom is overlapped with Harry because Dick overlaps both Tom and Harry, and he is between them. Finally, applying that same sentence a third time, you see that Pauline is overlapped with Harry because Dick is a “boat between them” and overlaps them both.