In AutoCAD, there are two coordinate systems: A fixed system called the World Coordinate System (WCS), and a movable system called the User Coordinate System (UCS). In the WCS, the X axis is horizontal, the Y axis is vertical, and the Z axis is perpendicular to the XY plane. The origin is where the X and Y axes intersect (0, 0) in the lower-left corner of the drawing. You define a UCS in terms of the WCS. Virtually all coordinate entry uses the current UCS. Moving the UCS can make it easier to work on particular sections of your drawing. Rotating the UCS helps you specify points in three-dimensional or rotated views.
Snap, Grid, and Ortho modes all rotate in line with the new UCS. You can relocate the user coordinate system using any of these methods:
1. Move the UCS by defining a new origin.
2. Align the UCS with an existing object or with the current viewing direction.
3. Rotate the current UCS around any of its axes.
4. Restore a saved UCS.
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