1. Yes, 100%. Low profile, reduces their chance to spot you.
2. Yes, refer to answer 1. Under water with only scope up is much harder for them to spot you.
2b. I would assume so, but also will depend on the ship tracking you. Merchant ships probably have less capability to track you. Warships have much better equipment to track you.
3. I don't know but it's long range (+20k). Louder is closer.
4. Not sure, but you should adjust the depth to hit near the middle, I believe.
5. Probably but not sure how it's setup in this game. Just try to hit the ship
6. Yes, night time is harder to see. During day time clear weather if you can make out their deck, they can see you.
7. No Clue.
Would love to see wake implemented! Would be great to help with heading and speed. For now smoke stacks is all we got.
PS. agreed great sim.