WCS and UCS

The different coordinate systems in TurboCAD makes it easy to adjust to 
different drawing environments, for example if you draw round objects it may be 
easier to use polar coordinates.

The World Coordinate System (WCS) is the internal,  high accuracy (10 digits) and absolute coordinate system.  To display the WCS axes, select Workspace / World  Coordinate System, and they will appear at the lower left  corner of the screen. The WCS indicator does not represent the  origin; it indicates orientation.

WCS Indicator

The User Coordinate System (UCS) is the coordinate  system in which you are working. By default, it is located to  coincide with the WCS, but it can be moved and relocated by  the user. UCS axes can be displayed by selecting Workspace /  User Coordinate System, and they appear wherever the  origin is located. Selecting an object using 2D Selector mode  changes the UCS (and therefore the workplane) to the one  attached to the selected object.

UCS Indicator

In each coordinate system you also have an option to use either relative or 
absolute coordinates.

The UCS indicator is helpful if you want to see how the UCS moves. You can 
display markers for the UCS and WCS via the Workspace menu, and customize the 
markers' appearance via the Preference page of the Program Setup (Options / 
Preference). The WCS indicator is always shown at the lower left corner of the 
screen; the UCS indicator is shown at the UCS origin.

Set UCS by Selector: Moves the UCS origin to the selection reference point.

Set Selector by UCS: Moves the selection to the UCS origin (similar to the Place on WorkPlane option for 2D objects).

Note: The 2D Selector always moves the UCS (Workplane) to the selection.