[Castout]

Well 100% plus the OLC GUI which implement realistic manual TDC solution measurement. Nothing less. Though I do play with stabilised view but that is because the mod is handicapped to play with it(no adjustable vertical tickmarks).

EDIT
You know don't think the stock procedure for firing out the fishes is easy.
With the poor accuracy especially with the AoB guessing it's very hard to hit longer-range targets.

With OLC GUI mod you can hit targets as far as 4.5km with relative ease. It's true.
Of course the difficult part is to hit a fast target at close range because the OLC GUI requires more time to get it done(but not that much more). In those circumstances let your wit play. Measures up only the speed then the range if time still permits then just approximate the AoB. Voila the fish(es) is out. Just like the way the ol Kaleuns do it.