You're close, do this:
1) Turn PK off
2) Take a range/bearing with the stadimeter and send to TDC.
3) Wait at least ten seconds. In RL it would be more, but the devs said 10 seconds is enough.
4) Take another rang/bearing with the stadimeter and send to TDC.
5) Click the Estimate Speed button. Look at the speed and course estimate your crew gives you.
6) Repeat steps 3-5 several times if possible, and average out the various speed/course reports your crew gives you.
7) Send the estimated speed to the TDC.
8) Adjust the AOB and send to the TDC. Adjust and resend until the bow of the target on the TDC (the top dial) points to the to the estimated course of the target on the outer ring.
9) Take another range/bearing with the stadimeter and send to the TDC.
10) Turn on the PK.
Now the PK should perfectly track the target, not counting of course the error inherent in the crew's estimation and your own range measurements.
Note that this is just one way to get the AOB. In real life, they would estimate visually, and check against the plotting team's calculations if they were available.
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