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Then simply compare bearing of target in periscope to bearing computed by TDC - over a period of time. Reinput data with a faster speed if the TDC is lagging behind the peri bearing. When you get it right, they will match and you can shoot. Its not perfect, but is ok for those rushed shots on 100%..
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You are getting the idea here though! When the PK is lagging or advancing to your visual sighting, it is off. Usually your speed. The AOB on the PK should remain constant to your visual AOB. From a distance the PK AOB should move very slowly. If it is dragging or advancing AOB but the AOB of target has not, then the speed is off. Drop or advance two kts (depending if it is dragging or advancing). Let it run again and see how you comparing. As you close the target, the AOB will start to move more quickly but the PK and visual should look identical. If so, you are dead on speed calculation. I do not concider sending torps until 1200-1000 yards. By that time, you have had about 15-20 minutes for observations and adjustments. It is a neat gadget when you figure out it's inner workings!