Assigning a Coordinate System to the Current Drawing
Concept Procedure Quick Reference

You must specify a coordinate system for the current drawing to take advantage of the coordinate transformation capabilities in AutoCAD Map 3D.

After you bring objects into the current drawing, do not change the coordinate transformation options if you plan to save changes back to source drawings. The save-back process uses the original settings to determine whether adjustments are necessary to restore objects to the correct coordinate system.

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