One addendum. Use the WO to post the solution on the attack plot. Pick your far target first, then repeat for the near target. The only thing you need to update is range and the intended tube (if using a mix of steam or electric torpedoes). The difference in time is how long after the first shot to shoot the second for arrival at the same time.
Another method is to assume a column separation of 700 meters, then measure distance to the track along the gyro angle. A 30 kn torpedo will travel 930 meters in 1 min, therefore you should shoot the near target about 40 seconds after the first shot to get arrival at the same time.
The optimal setup for this is long range shots. I would not attempt 5 (or even 6) simultaneous shots when inside 600 meters because of the high gyro angle. The fast 90 method is superior in these situations. Time is not a factor here because the contact cannot maneuver fast enough to avoid the shot, and shooting with a high gyro angle leads to a higher probability miss due to weapon turn time.
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