The difficulty is in the fact that the graticules are not centered, which makes it very difficult to confirm the actual number of ticks. You might be at 2.2, or 1.9, or some other not exactly 2.
I'd work backwards. Get range on the map, dial it in to the mast height, and see how many ticks are shown at the hash mark. If it is slightly different than the 2 you've indicated, then you're just not being precise enough. If it is vastly different, it could be that you need to select a different multiplier or hash position on the disk for the magnification you are using.
That having been said, I've not seen *any* correct implementation of the RAOBF beyond karamazov's initial implementation up to and including Makman's. Everything after that seems to be off.
I've had problems moreso with determining AOB - the value dialed in and known to be good because I checked before hand with the map tools, doesn't match the value that shows up in the scratchpad.
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