Copyright Goodheart-Willcox Co., Inc. Chapter 4 Understanding Three-Dimensional Coordinates and User Coordinate Systems 105 Managing User Coordinate Managing User Coordinate Systems and Displays Systems and Displays You can create, name, and use as many user coordinate systems as needed to construct your model or drawing. As you saw earlier, AutoCAD allows you to name (save) coordinate systems for future use. User coordinate systems can be saved, renamed, set current, and deleted by using the Named UCSs tab of the UCS dialog box, Figure 4-33. The Named UCSs tab contains the Current UCS: list box. This list box contains the names of all saved coordinate systems plus World. If other coordinate systems have been used in the current drawing session, Previous appears in the list. Unnamed appears if the current coordinate system has not been named (saved). The current UCS is indicated by a small triangle to the left of its name in the list and by the label at the top of the list. To make any of the listed coordinate systems active, highlight the name and pick the Set Current button. A list of coordinate and axis values of the highlighted UCS can be displayed by picking the Details button. This displays the UCS Details dialog box shown in Figure 4-34. If you right-click on the name of a UCS in the list in the Named UCSs tab, a shortcut menu is displayed. Using this menu, you can rename the UCS. You can also set the UCS current or delete it using the shortcut menu. The Unnamed UCS cannot be deleted, nor can the World UCS. PROFESSIONAL TIP PROFESSIONAL TIP You can also manage UCSs on the command line using the UCS command. In addition, by right-clicking on the UCS icon, you can select a UCS from the UCS icon shortcut menu to make it current. Figure 4-33. The UCS dialog box allows you to rename, list, delete, and set current an existing UCS. Figure 4-34. The UCS Details dialog box displays the coordinate values of the selected UCS.