I'm an idiot in making TMA solution but as far as I know the precise triangulation you mentioned is no longer applicable in DW and it's more realistic that way.
In the previous title like Sub command you will get a perfect precise triangulation when you have a contact tracked with two or more sonar arrays.
I'm not sure as to the exact why but my guess is that for one the different positions of the sonar arrays it self would render perfect triangulation almost impossible. And another that sound doesn't travel in a straight line underwater so you are bound to have bearing differences that would make perfect triangulation almost impossible.
TMA is not a science to me but a kind of an art
. That's another way of saying a thoughtful guessing.