Actually both methods detailed here are quite similar. As far as I can tell, the so-called O'Kane method can basically be described as "Fast 90 With Radar". It uses the Fast 90 method linked in the first reply, but target track is found via radar instead of stadimeter and bearing observations.
Of course, as much as the O'Kane method (as described) is down on estimating AoB I seem to recall old Dick himself actually had a lazy susan set up with a ship model and constantly practiced making quick and accurate AoB estimates by sight.
Both the Fast 90 and O'Kane methods are ambush tactics, requiring a lot of setup time to get into a nice perpendicular firing position. I have to take a huge amount of time making repeated measurements, fine tuning every variable before I fire if I want to hit anything. I was shocked when I read "Iron Coffins" and they were making snap shots against different targets in rapid succession just using basic information and a quick glance through the UZO, and hitting targets relatively frequently, even while maneuvering.
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