http://www.paulwasserman.net/SHIII/#Step%204:%20Calibrate%20Scope%20&%20TDC%20(f9)
good step by step instructions on all the steps needed to manually use the TDC.
Sounds like from what you described you have missed one of the scope/tdc calibration steps since the green line shows the currently programmed gyro angle for the selected torp it it was way behind then somewhere you've missed a step.
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