Jazman,
I had a rough time with high school algebra. All I can say is that range is the least important component of a firing solution, no matter what method you are using(with some exceptions that probably dont apply here.). At any rate, on the nav map, draw a line representing the target's course. Pick a spot that marks the approximate location of the target where you plan on torpedoing it. Measure the range from that spot on the target track to your sub and enter it manually into the TDc. If you have an accurate speed estimate and your range is under 1500 yds you should be getting hits. I hope this helps. Someone with better math skills than me is going to have to explain the mathematical reason why range is not important. Joe
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