The torpedo track line in the attack map is a passive display of the TDC solution so there's never a way to change it directly. You'd have to change the bearing, speed, AOB, range, etc TDC data to have that affect the displayed solution line.
Not all of the same input panels from the periscope/TBT stations are not available on the Attack map station however. It doesn't make a whole lot of sense but neither does not being able to draw on the attack map. U-boats have most of the good TDC controls on the attack map and not the periscope screen so you can't win either way.
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