It should also be mentioned that, to the extent possible, try to shoot with a low gyro angle, within 20° from your bow. That means the torpedo doesn’t have to turn very much. There is a gyro angle readout on the TDC - make sure it reads anywhere from 340 - 20. The reason this is important is that it all but eliminates range as having an impact on the solution. Once you get better, especially at rangefinding, then try to shoot at larger gyros.
Range is only really needed at higher gyro angles, especially at close range. The only reason there is a range dial on the computer is because you’re not literally firing torpedoes out of the lens of your periscope. There is a concept called parallax error, which is caused by the distance between the optics and the point at which the torpedo gets on its course. The range setting is there to account for error caused by parallax. When the gyro angle is low, you can imagine that parallax is hardly a factor anymore (as optics and torpedo course are more aligned).
So seek to minimize to gyro angle so that you can all but eliminated any errors caused by inaccurate range.
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