I just flipped through the NFHS umpires manual. I didn't see any reference to positions C1 or C2. There was a passage describing the field umpire's position as "behind and to the shortstop's left" for runner on 2B only; and "behind and to the shortstop's right" for runner on 3B only.
I have more training tomorrow, so I'll pose the question then.
Ted
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