Another approach is to look at the target's bow and stern and note the difference in bearing change on the scope. This tells you the max arc that the torpedoes should stay within when firing a spread. Usually I use +/- 1 degree at 1000 yards and +/- 1/2 degree up to 2000 yards. If the ship keeps changing speed and course, a wider spread is required to try to compensate for what he might do next - and some misses will result.
The only way that I know of to update the scope bearing with the US TDC is to just click the range/bearing button without taking the range, again.
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