Ok first things first. If a contact is evading you sure as hell don't want to waste time doing a tma on him during this phase.
Lets suppose you had a correct tma, and the moment you launch a torpedo he goes evasive.
Now you know what his position, speed and course is at this moment, mark it on the navmap.
Then go in the sonar station and look wether the contact has launched countermeasures. If yes mark them with a tracker. Countermeasures don't move so with 2 bearing lines you'll get the position of the cm and therefore a very precise estimate on where your prey is.
Next, go to the broadband and search for the contact. Look at what the track is doing. If his bearing line goes in one direction and then goes in the opposite direction he has inverted course.
Next, you have uuvs use them. If the contact is near a uuv can be really handy.
Last if everything else fails use active sonar. Ping the hell out of him and steer the torpedos his way. Don't give him time to react. Be sure to place yourself on a lag course before initiating an attack.
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