No repeat the same thing when you have escorts 'hovering' on your tail, and you can only pop you scope up for a second or two, not to mention getting into position after avoiding the escorts.
The only passive sonar method that I work with is to go deep and then pop up in the middle of the convoy - there's no time for all the frills, and the only thing you can do is lock onto a ship and count revs on the way up. When at scope depth ID the ship, and determine speed and attack angle. Punch this all into the TDC and fire... All within about 3 to 5 minutes.
Timing is critical and it's a very tense few minutes
Then dive again to avoid escorts.
I'm busy with a video tutorial of this.
