I belive the OP is asking about a "snap shot" wherein you use best guess estimates.
Just set the range to some reasonable number, spread angle to zero, speed to high, open the torpedo door have the periscope at zero and take your best guess at lead and fire the torp and hope for the best.
Be advised though you had better be a little ways out otherwise the torp wont arm and will just doink off the target.
Personally I prefer to let the TDC do its thing its a lot more accurate than I am.
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