i think....
you may be using the constant bearing method. See Rock n Shoals thread in the Skippers Bag of Tricks thread. Unless the target is going 0 kts. the TDC will compute a lead angle, even if the PK is not activated. In the constant bearing attack, you point the periscope at the bearing you will fire (i.e. 5, 25, or 60 degrees bearing.) Set Aob per the tutorial instructions. Input target speed and range. When the target crosses the wire, fire. The TDC will automatically input the lead angle. It is like O'Kane, but you can use it an any angle. Other than that, I am not sure what you are doing. In the constant bearing attack, Rock n Shoals indicates his boat is stationary. Of course, the target is moving.
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