Chazly; Let's assume we're in DW and you have a sonarman with a waterfall display. What's he seeing and hearing?
OK, he picked up a torpedo in the water.
He needs to tell the OOD something, NOW.
He doesn't have time to calculate range or course, he just has the data.
In terms of DW, all he has time to report is a TIW, its bearing, and whether it sounds like its close or not. Its then up to the OOD to initiate an evasion of some kind.
Keep it practical.
There isn't time to worry about TMA when the bleeping thing was aimed at you.
