The torpedos are set to "magnetic" by default. Actually the pistol is a combination of impact and magnetic fuse. If you want to disable the magnetic fuse to avoid premature detonations switch to impact only. The settings are persitent - no matter what station you enter. A reloaded torpedo has the standard settings again (slow speed, Impact/Magnetic combo, ~ 4 meters running depth).
I don't sneak into convoys - I shoot from far outside to avoid being detected by DDs.
You earn promotions by sunk tonnage per patrol. If none of your crew can be promoted by experience the game doesn't offer a promotion.
There are some fixed steps for how many promotions are offered; per patrol 4 promotions are maximum.
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