Cold (i.e., not aware of you) = about 800-1000M
Hot (searching for you) = 1500M
Pinging = 2000M at best
The BIG problem with late war sonar is that weather and depth are no longer obstacles. So unless you have a XXI and can creep out quickly at silent speed, it's virtually impossible to avoid them. The few examples I've heard seem to have happened when luck lets you creep far in one direction AND the destroyer makes a bad run in the opposite direction, giving you enough time to make a gap.
Decoys work, but only in a very narrow band. You have to place them between you and the escort. I use them in one of two ways:
1- Let the sucker get right on you tail, and at 100-200M drop a decoy. Any closer and you get hedgehogs. Any further and it doesn't work. What you want to happen is for the destroyer to magically stop on a dime and ping away at that decoy. You quickly turn and launch a torpedo at it. Careful though, as it does tend to have some drift. Aim for the middle of the boat.
2- Leave a fan behind you. Something like:
S
X Y Z
DD
Where you are S, and the destroyer is DD. You leave a screen that blocks you out even as you leave. Do it by turning tightly and dropping decoys, then turning back into the screen. Marking you map as you do this can help. It's not always effective, but it's about the best I can come up with.
Otherwise, your only hope is homing torpedos. Late war destroyers are simply nasty with their better sensors and better crews.
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