Ah thanks kapuhy I missed that question of his.
Generally they strove to shoot at the smallest gyro angle possible, as that eliminates range as a factor in the torpedo triangle. So in this case , assuming the target is not excessively fast, they’d lay rudder and set up for another minimum-gyro shot.
Now, depending on the version of TDC aboard, this could be a tough or easy proposition. Prior to mid-41, the TDC aboard was very much “point and shoot”; it did not update AOB for bearing changes, and more importantly it did not have connectivity to the gyrocompass. So in this instance, assuming your situation above, they’d need to turn to a new lead course, reset AOB for some future bearing, wait til target crossed that bearing, and shoot (called shooting “im Durchwandern”).
Enter the TDC model S3 in mid-41. This computer, among other benefits, also had connectivity to the gyrocompass, and it had an AOB synchro motor. This meant that, when told to do so, it could update AOB for every degree of bearing change AND own course change (a feature called “Lage laufend”). So in this situation above, Lage laufend would already have been switched, so all that needed to be done is for the U-boat to change course, and as long as the optics were kept on target, the AOB would be correct (assuming no target course changes). This model even took the U-boat’s turning speed into account when set to do so, allowing the boat to fire while turning. The own-course tracking feature as well as turn speed correction are sadly features we miss out on in SH3/5.
They could of course just simply choose to maintain course, and as long as the gyro angle is within 20° or so of your bow, range is still pretty much irrelevant to the solution, so there’s that as well.
So very much dependent on the equipment aboard. The S3 model was a significant improvement and allowed the boat to react to changing situations like this.
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