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Originally Posted by TorpX
(paraphrasing) 3 knots = 48 hours, 6 knots = 3 hours
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I don't know how accurate Silent Hunter is in this regard, but that's a huge difference in endurance: 144 nm @ 3 kn versus 18 nm @ 6 kn. I expected a large difference, but not that large, so if you're submerged, choosing the intercept that lets you go as slow as possible (i.e. NAC) seems like it would outweigh other considerations much of the time.
The OAC seems to require knowing the target's course, so I imagine it's one of those things you'd use after you get close enough to see which way the target's headed.
I didn't get the impression that you were presenting an overly rigid method, by the way. :-) These are all good tools to have in one's toolkit, to use and adapt as best fits the situation...