That Red Book quote with the two latest ticks is quite interesting, I may have to test that at some point. The towed array can have decent bearing error that produces a sloppy looking dot stack in the TMA, I can't imagine that the red book scenario would be true for that. Does anyone know if the towed array bearing error is a stock game thing or if RA added it? Regardless of whether the Red Book thing is correct or not, two points always make a straight line so I'm always skeptical of those kind of situations
To throw in my $0.02 to the original question, I like doing manual TMA as a "time killer" and it kind of makes the game like a puzzle game. Auto TMA is good for very busy areas or evading torpedoes.