[Bellman]

I agree with much that has been said above paricularly as it it applies to opposing the AI or unwary MP sub skippers.

However in MP sub v sub torp engagements are unrealisticaly* longer ranged and require raising tactical considerations above the mechanistic. It is not IMO appropriate to fixate on rigid TMA procedures. More a flexible approach requires course adjustment/s to place target in a beamed lag relative position whilst building the picture.

Injudicious change of course as prescribed in zig-zagging could take you from lag to lead throwing an anchor line** on the wary opponents TMA display. This will give away your specific range. The problem, at greater ranges, is that in pursuit of lag you hold a broadly reciprocal course and therefore are opening range. A carefull assessment of means of masking your risky turns and range reduction have to be devised. (Topography, layer, neutrals etc.) ***

Initiating TMA techniques should be secondary to good tactics.Much depends on your take on your degree of stealth/surprise and opponents skill/ability to prosper from any careless 'dancing' moves.

Edits:
* 'Knife fights' 1 - 4 nm it is claimed are 'realistic.'
** Construct your own scenario to observe the 'anchor line' range giver.
*** OR just gamble !! Sometimes you have to make a trade-off - giving to get ! Egs. change layer, speed and course early before he catches on !