You have the Nixie, which is 85% effective against non-wakehoming torpedoes (at least for one use until you can rig it back in and out again).
First of all, countermeasures other than the Nixie should not make torpedoes explode on CM's and that's the way it is in LWAMI so my answer will account for this.
I am also assuming you have verified that the torpedoes are actually headed your way, which is a whole different topic. Evading torpedoes not aimed at you is worse than evading late.
In stock DW, for subs, set course 180 from the incoming torpedo, and fire two decoys. Repeat this until there are no more torpedoes in the water.
For LWAMI, (for LWAMI4, to be released, GO DEEP! most torpedoes lose speed at depth, and some can even be made to exceed max depth and shut down if they are tracking you) I recommend setting course initially 180 from the incoming torpedo and going to flank. Fire a single active decoy, and then another active decoy about 1-2 seconds later. Then turn course 90-130 from the torpedo (using a more acute angle to the torpedo if it is closer, hard left or right rudder to a full reverse course if you believe the torpedo has already acquired your decoys). Then head on until you don't think the torpedo is a threat any more (not pinging you), or you need to slow down and reestablish situational awareness.
Generally speaking, the more you run, the more you increase your chances of dying from something other than the torpedo you are evading. Use only enough to get away, with the following exception. If someone really has the drop on you, and you want to get out, then stay on a fast evading course, to "clear datum" and make sure you don't stop until you are out of range, but if you want to stay engaged, don't go running around aimlessly.
For the FFG's, for LWAMI and stock the plan is more or less the same, clear datum at about 90-130 degrees at max speed with the Nixie streamed. If you are facing more than one torpedo or wakehomers, then your situation is much more serious. For acoustic homing torpedoes, you have to hope you can clear the datum. Wakehomers can be avoided easily by the FFG if you are at 5kts or under... sprint at an angle for some distance and then cut to 5kts.
Cheers,
David
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LW

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