For one I will have the base speed long before I attack, when cams offs using radar mod or just a guess based on if I can parallel it's course and match speed, pass it, ect. Most TF run at 17-19kts. Usually I let them find me on radar and will run from the group so they will go into zig mode, that slows them down and I will run away until the escorts turn back and track my end around.
When I want to attack I will have course by making marks and using the tools to figure his base track, again using radar mod or if contacts on rather simple, no need to explain.
The only TF I've seen hit 30kts of more are the fast dd groups in the slot, but I attack them all the time as they come in one line.
Usually when I pull the DD's away and dive I hope to be 3-5000 yards off my attack track and not come back to surface. I did surface once in my Y attack because I was able, but that's rare.. If you can pull the escorts away at about 5nm's I've never had a problem diving going flank and putting them 3000 yards behind me hunting out of sonar range. If a TF is going faster say 24kts...you still should be able to travel 1500 yards at flank before they can reach 5nms, giving you a 1500 yard shot.
Sort of think of it as a triangle. The TF the tip coming down the left line, the escorts coming faster down the right line and you the bottom line right moving left wanting to be where the left line connects your base before the TF gets there and the escorts should be searching at the base right line when you attack.
When I attack, I'm setting up a normal two stad measurments for course and speed, leave PK locked, unlock scope, reset bearing at the bow and shoot by the wire. The group should be zigging, you may even get into the middle of it before you need to shoot and can use all tubes on several targets. Often you'll have to guess AOB based on his zig pattern, not what it is at the moment.
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