This is how i operate the boat in single player (noob).
 

Starting the mission .
Check the game time on the clock in the command or sonar room .
Check hatch is closed .
All stop engines .
Go to electric engines .
Open forward and aft vents .
Check main ballast tanks are full .
Close forward and aft vents .
Check sub is at least at 20 mts .
Blow negative tank . (sub should stabilise depth level) (dont need to touch the dive planes if you dont want to) .
Check dive angle is at zero degrees.

Go to hydrophone .
Quote by Baal on the discord channel .
''You only use high/low pass to filter out sound of specific contacts you want to hear
low is best for picking up engine noise, and high is best for hearing screws
it's pretty finicky though, so it takes some fine tuning''
''also, if you have no reason to use high pass, just set it to 0
high pass pretty much just neutralized sound of contacts unless we were close enough to hear screws''

I set gain at around 2.5 to start off with .

Surfacing the boat .

Crash diving .

Map tools .

Thank-you sober for the list. I need all the help i can get .I will be heading out about midnight if all goes well in rl.