This is the one that is moveable and can be manipulated by the user. The UCS as mentioned is a user-defined coordinate system. Like the UCS, it hosts the X and Y axis in 2D and the additional Z-axis in. This is so that the package has a default system that it can refer to when manipulating your objects, adding new elements and doing the rest of the things you ask of it. The WCS is a coordinate system that is fixed throughout your CADing activities. Read on for more information about the two. With AutoCAD and some other CAD products, the coordinates are divided into two systems. For this purpose, the inherent nature of coordinates and the subsequent introduction of coordinate systems is of little surprise or debate. Any rotation, skewing or other manipulation is done with the help of mathematical equations and the help of regular geometric and algebraic techniques that work with the coordinates. In the world of CAD, play a part as important as any other. The WCS and the UCS are initially coincident in new drawings. Understand the World Coordinate System (WCS) All objects in a drawing are defined by their coordinates in the World Coordinate System (WCS), which cannot be moved or rotated. Here is the workflow to change the UCS back to. Within AutoCAD which may need to be updated to a World Coordinate System (WCS).