To create a red line, having first three lines, you first plot completely random course line. It intersects all three lines and extends forward, where you expect your target in the future. This course line will be our base to determine the first point which the red line will be going through. Take a compass and along this hypothetical course measure the distance between first and second line. Let course intersection with the second line be p1. Move this length now from p1 towards the third line. Mark m1. Now at that mark draw the parallel to first line intersecting the third line at m2. Now take the compass and measure the distance from p1 to m2. Move the circle so so it begins at m2 now. Mark m3 at the arrow end. It is the first point of a red line. For the other random course line do the same to have the second point for red line.
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