It's a holdover from SH3. I used a similar chart while playing SH3 for interception. It makes more sense there because of the metric system. I asked, I believe, CaptainCox to make an art graphic for me. I had done all the math tables myself, in both imperial and metric, but in my zeal i didn't pay much attention as to if it was needed or not in the imperial system. When i was done i sent CaptainCox the info, and he made the graphic. So the mispelling of conversion, and "official use only" was done by the artist. I never got around to correcting it.
Somewhere there's the metric version, but i don't know if it got accidently dropped or is still in the optional mods somewhere. These charts were crucial in SH3 in my opinion. It's funny how most people don't even know what they're for anymore.
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