The TDC works like a spreadsheet
Entering new data replaces the old. In order to switch to a new target you have to enter info in this order (the first two can be reversed without bad effects): speed of new target, AoB of new target, and last (that is important!) the range/bearing of the new target. It is not necessary to turn off the position keeper at all. Make sure you didn't forget anything by switching to the attack screen to ensure that your target is properly entered before you fire. Always verify that you have a good solution before firing, as the real boats also did.
If you do not have time for that, can you afford to waste a torpedo? If not, start over with a new setup. Patience, grasshopper!:hmm:
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