GWX questions

[Bosje]

Hello, gang

I got killed and was determined to adhere to DiD so I thought this might be a good time to try running GWX 2.0

my computer seems to manage just fine and I have been checking it out all night, what a glorious piece of work!

First of all: I prostrate myself humbly before the team, you are gods
second: I have some questions (after reading almost the entire manual)

-what is that round rotating antenna on the bridge doing? is that the radio?
-is it even at all possible to complete the academy exams in gwx? (mainly the gunnery exam)
-I find the observation scope kind of annoying, right in my view as I try to communicate with my LI and as I want to climb through the hatch to the radio room. do you guys advise using shiftF2 while the boat is rocking about or while depthcharged or is that prone to game instability?
-Is there a tutorial for learning to interpret hydrophone noises correctly? would be good to be able to hear some examples of merchants moving away and closing, slowing down and speeding up, warships dito, biologicals, torpedoes etc.