First "training ASW" finished!
10:28 target detected (under layer) by TB-16 at 18 kts
10:30 praparing to attack - going above layer at 18 kts almost straight to target
10:33 attack and eveding possible counterattack (25 kts, course N)
10:37 next step of evading tactic (25 kts, course WsN)
10:40 next step of evading, active torpedo speed up to 55 kts (25 kts, course WSW)
10:41 first torpedo makes round on decoy, second (passive) chcange to run over layer. (8 kts, course S SW)
10:45 TIW! , zigzagging own torpedoes seaerching target, contact with enemy by TB-16 (8 kts, course S)
10:51 my torpedo (passive) lock target on north and speed up to 50 kts (8 kts, course S SE)
10:52 Victor hit!
Link to my replay file
Afterall i think this kind of mission are good only for Single Player. Its because AI have own, specific algorithm of actions.
Please stop with "training missions" and do something more complicated for SP or MP modes

From my experience not detection but identification is really difficult.
In this mission I knew, first detected 50 Hz signal is my target.
BTW: this kind of "training" takes in editor 3-5 minutes (for yoursefl do not need text messages and "win/lost" triggers)
Thanks for new mission - it is always good for DW community, but please next time for something more complicated!
sorry for my bad english