The TDC represents in real time (if the data entered is good) your sub and the targets relation to each other. Best time to shoot is 1500 yards are closer, this helps with any small discrepencies in speed, AOB, or range. I also fire my torps when the target is between 20 degrees and 0 degrees off my bow. You can either do this visually with the scope/TBT or have your sonarman call it out as the ship moves across your bow.
The way I learned and figured it out to do it manually was using the auto target function in the game. The little triangle turns colors red (bad) yellow (better) green (best). I played and kept an eye on the triangle, specifically when it turned green. I looked at the TDC set up at the time it was green. After some note taking, I basically just made a mental copy of it and switched to manual. Took sometime but this plan worked for me.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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