> ## Modifying a User-Defined Coordinate System

> 1. From the Analysis menu, select Set User Coordinate System.

> The User Coordinate Systems dialog box appears.

> 2. From the Coordinate Systems list, select the UCS that you want to modify.

> The settings you configured for the UCS are displayed.

> 3. To change the name, highlight the name enter the new one.
> 4. To change the position of the UCS, click the Position tab, then from the Define From list, select the point where you want the UCS axes to appear.

> See Position Options

> 5. To change the orientation, click the Orientation tab, then from the Define From list, select the point where you want to orient the UCS.

> See Orientation Options

> 6. To show the UCS axes, select Show Trihedron. To hide the UCS axes, deselect the check box.
> 7. To change the UCS that it is relative to, select the UCS from the Relative To list.
> 8. Click OK to close the User Coordinate Systems dialog box.

> If you modified the position or orientation, the UCS axes dynamically move to the new position. A change in Show Trihedron option will make the UCS axes appear or disappear accordingly. Additionally, a name change will display the new name in the Coordinate Systems list.

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