Granted, I don't know too much about submarine tactics. But I know that a sub is easier to spot if the periscope is up and you are going at high speeds. The thing is, otherwise you won't be able to spot jack ****. Hydrophone is not properly implemented to the map yet, so that's how the game works...for now.
I don't know if you watched one of my streams, but my chatbox is pretty tiny. Also, the game is NOT really realistic at this point. It also does not intend to be fully realistic, it is not a simulation and was never advertized as one.
Last but not least, you can't upgrade your sub while at sea. Where did you get this from? Your officer you send to the research facility will probably have unlocked an upgrade while you were at sea, but you have to return to the harbour to actually upgrade your U-Boot.
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