Well,
German submarines had "fan-shot" controls and this was replicated in sh3. You selected a group of tubes (from the historically accurate options), the spread of the salvo, and you pressed "fire".
US submarines didn't have this feature, and neithre does sh4. Instead, you select an individual tube and apply a so called "spread" to the already established gyro-angle. So you can fire tube 1 straight to Middle of Target, tube 2 with a spread of 2 degrees to the left, tube 3 with 2 degrees to the right. voila salvo control.
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