No, it's not like the PK. On german subs you can't input data into the TDC unless you turn off Autoupdate. Actually what Autoupdate does is to link the periscope movement with the bearing dial on the TDC. That dial is at the same time linked to the AOB, Inpact angle and Gyro dials. So:
Autopdate OFF: you can input data, but if you move the periscope nothing moves on the TDC
Autoupdate ON: You can't input data but if you move the periscope you'll see other dials turning as well, plus you'll hear a clicky noise.
One thing to note (and written in the tutorial) is that if you move the periscope while in the Autoupdate OFF mode, when you turn it ON again, the Bearing dial will simply jump to the real value but without updating the AOB dial, thus breaking the solution. So don't move your periscope in Autoupdate OFF mode... ever.
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