MACSYS UCS

The MACSYS coordinate system is not used in GPP2, except for the fact that it is the default reference UCS (REF). Therefore, GPP2 does not include any system variables that define MACSYS in any way.

If MACSYS is used as REF, then it's data if implicitly known (0,0,0,…)
If another UCS is used as REF, then MACSYS is not used in any way.

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