Like I said. You are putting the ruler on lines that are recorded while the towed array is in the turn. Those are pointing in the wrong direction. Unfortunately the game does not allow to remove individual lines and leave the valid ones in the screen. Instead one has to make a mental note of them. From the time you start the turn until the time the end of the towed array is between the time marks on the new heading you shoud not put the ruler on those lines.
You seem to have the towed array extended all the way. You can make due with a shorter TA. I usually extend it only a 3rd of the way. It shortens this time tremendously and reduced bottom dragging.
And important also, you need to have the ruler on lines before and after the turn to get a correct track. One of the two will not give you a unique solution. So try again with a longer dotstack timeframe.
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