Other than the lead angle calculator, how do you use the Wheel when it is too dark to see the target?
Here is an example.
It was so dark on my last mission, that I had to plot a convoy's course on the Nav. Map. I set its speed per the 3 minute rule. I set the firing point from your calculator after setting the wheel for a broadside to the target's port (O'Kane method.) I barely could see the target crossing the "wire" at a range of 800 yds. I watched the torpedoes run on the Attack Map, and saw the target sail right into their path. I never saw the impacts, but my sonar man announced 4 out of 5. I gave up on the rest of the convoy due to poor of visibility.
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