First, you'll need to ensure the values you put in the scratchpad are going to result in a good solution.
Make sure you identify the target and check that in the scratchpad.
Range: accuracy depends upon the highly inaccurate stadimeter. RAOBF is more accurate. If you have map contacts on, the compass can be used to measure range with high accuracy.
AOB: if eyeballing, it takes practice. If plotting, it is pretty well accurate. RAOBF is also accurate.
Speed. If doing the scratchpad stop watch (or any stop watch comparison to known and optical length), then ownship should be stopped and target crossing close to zero bearing for best accuracy. Plotting is most accurate.
Without fancy tools RAOBF, calibrated stopwatch), plotting two range/bearing pairs at an interval of 3:15 and measuring distance between them will give you target course (and thus AOB) and target speed.
After entering each value and clicking the checkmark, you need to click the checkmark again to transfer them to the TDC.
Lastly, make sure your muzzle doors are open before firing - the slight delay between hitting the switch and the fish leaving while waiting for the doors to open will result in missing astern almost every time.
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