You dont need to be at exactly 90 degrees... and you are not even leveraging the biggest plus of the U-Boats TDC.. the linked AOB & periscope.
It can function as a pseudo lead angle solver.
1. Approach target from a desired angle (doesn't have to be exactly 90 degrees). It could be 60 or 30 or 45.. whatever.
2. Input the target's AOB if you are looking at him.. or put the scope at 000 and enter what it would be if he was on your nose.
3. Input the targets speed.
4. Input any range.
5. Move the scope until the gyro reads 0. (this is your lead angle)
6. Fire when the target reaches the periscope line.
Works for any speed.. any angle.. any range. And you dont have to draw a thing on the map.
7. If you dont want to wait for him to cross your "lead angle", you need to input an accurate range and fire whenever.
Your abritrary 10 degree lead is only valid for a specific torpedo speed, taget speed, and intercept AOB. If he was going faster or slower (or you used a slower torpedo) you would miss.
Use the TDC. It is smart.
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