Take two measurements. The second one must be taken after the target has zig-zagged a few times. Use the stop watch in the TDC (your XO) to calculate the base course and base speed. Set the AOB according to the heading calculated by XO (the dial on the right need to match target heading on the left). Adjust the torpedo spread to a slightly wider angle and let the fish go.
Of course, being close if possible assures a hit.
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