The early TDC models, that is, before model S3 that we are familiar with, did not have an AOB motor, and so it did not have AOB tracking. SH3 does not get any TDC correct. It has AOB tracking, but it also doesn’t take own course changes into account like the real S3 did. So Silent Hunter has sort of a blend of both styles of TDC.
What that means is, for the early TDC model, you need to anticipate the AOB that you want to shoot at, and then allow the target to cross the wire at that point, and fire. You may notice that AOB will change ever so slightly due to parallax, let’s say if you set the AOB long before the bearing you intend to fire, and you slew the bearing around in the computer, parallax will change, which will slightly change the AOB setting. So it’s best to set the AOB you intend to fire at relatively close to the bearing you want to fire at.
Any other questions on these computers, happy to help, I helped them implement both models from original documentation and schematics. There are elements of both computers that are not historically accurate, but they work fine for gameplay reasons.
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