To add to the speed of the torpedoes. Uboats used speed to time their shots during a convoy attack. When firing at multiple targets, you want your torps to hit at the same time so other ships do not make evasive manuevers. So you would fire at the furthest target first, at a slow speed to get more distance, and then fire at closer targets at faster speeds. But that means you have to
Wait for the first torp to get close before you fire the others. This is where ranging a target gets serious.
The magnet setting is not for "near" shots. You still have to
Get the angles right before firing, the magnet is set so You can send the torp under the keel of the ship and explode. The keel is the weakest point of the ship and almost garuantees a sunk ship.
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