[NorthBeach]

RR provided THREE charts. One for O'Kane, one for Cromwell, and one (Vector Analysis Attack Rules) that provides the formula for finding the precise lead angle for a ship going ANY speed. You can also figure out those angles using one of Solution Solver's tools.

I can easily combine O'Kane/VA or Cromwell/VA. O'Kane/Cromwell? Not so much. I set Cromwell/VA up at 45deg (ish). The only time I enter O'Kane into a Cromwell/VA attack mix is if I feel confident (or am delusional) about using it in an aft attack, swinging the boat into a 90deg, for a last shot in the salvo. The success rate for that is reeeeeeeeealy low as I've made a lot of noise and roiled up a lot of water letting loose the 6 bow shots. The only time I consult with the map is IF I consider trying an aft O'Kane attack, to locate the target. And, I only do that after I've sent my 45deg course change to the helm.

I guess I use a bastardization of the Cromwell. Because if I have a confirmed target speed of say 14kts. I'll use 17deg as my lead angle, just as I would for a VA attack. And, set the aob for 28deg.

Note: The actual lead angle for a 14kt target with a 45deg aob using a Mk14 set at 46kts is 15.5deg. I always round up as well as adding a degree of lead to compensate for being old and slow, as well as a slight delay from giving launch command and the actual launch.