With manual targeting you can have the TDC calculate the speed and AOB/Course, after you enter two range/bearing pairs with significant time in between. There should be a red button on the thing to let it calculate a solution. (it's been ages since I played RFB 2, and other mods may make a difference in how it looks) So, at the least you need to be able to do the range measurement thing with the stadimeter. Then once the calculation is done you set the course/AOB dial and speed dial accordingly to the result.
After that you can engage the position keeper to make it predict the current position based on progression from the entered data you provided. But if you were in error, then it too will be in error ofcourse.
Always provide a final bearing and range before shooting to sync up the old solution (or whatever the position keeper thinks it is) to where it actually is as observed.
Auto-targeting is as it is. Point, lock, and the bearing, distance, speed and AOB/Course is set perfectly to direct the torpedo. But you may not yet be in a favourable position to fire from. Some may accept or prefer that automatic precision. Others like the extra challenge. To each their own.
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