I'm too a devotee of the O'Kane method. Thanks RR
There is a couple of things that turn me off using the PK - the need to identify the ship
before range data can be sent to the TDC and the fact that the maximum range that can be manually inputted is limited to approx 1,200 yards.
From what I've read and seen, in RL (whoops, here I go with the real life thing

), the situation did not often allow the luxury of accurately identifying the target before establishing a solution. Initially, an estimate of the range was made based on experience and/or an estimated target mast height. Refinement of the solution continued from there.
In fact, after the engagement, the skipper and other key crew that saw the target would pore over recognition manuals in an effort to identify the target.
The limitation on manually entering range data is a PITA, particularly when SJ radar provides fairly accurate ranges which, as in RL, was used as the range figure for the TDC.
Anyway, for me it's O'Kane all the way and it works a treat. So far in my current 3 patrol career (TM 1.7.2, RSRD, NSM & ROW) I've sunk two Takao class CA's, one Hiryu class CV (woo hoo!!) and half a dozen merchie's.