nobody said a "good" solution. i said you can do TMA with less than three lines of bearing (and it certainly won't take 10 minutes). in a pinch you may not have 10 minutes, in such a case getting a general idea then letting your torpedoes do the final "tma" may be the best solution.
you guys are talking for extremely distant targets; of course the farther away a target is the more information you need, however when the target is for example, within visual range or only slightly beyond visual range, a reasonably useful position can be established simply using a combination of your sonar skills, common sense (i.e. taking geography/water depth into consideration), etc.
yes, you may only be able to determine the contact's heading to within 90 or 45 degrees but that's better than having nothing, especially if you're in a big hurry.
specific examples i can think of where this is useful is in a Kilo, after you've fired the first few torpedoes at a group of ships and they begin to scatter, but you can't come to the surface to check things out for fear of aircraft detection or cavitation or being too far from the layer, or any other number of threats.
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