If you want to use a UCS in creating a measure, you must define the UCS before you define the measure. If you are using a UCS, the references to the WCSX, Y, and Z axes on the dialog boxes are replaced as follows:

Note that displacement measures associated with cylindrical coordinates in the T direction, or spherical coordinates in the T or P directions, are in units of length, not angle.

If you select any of the options on the Measure Definition dialog box that require a coordinate system selection, use the arrow button to select a coordinate system relative to which you define the measure. The default coordinate system is the WCS. You can also select a UCS.

For more information, see About Coordinate Systems.