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There are several default ordinates systems configured for use, and you can edit these or define additional systems. Most logical combinations of ordinates are allowed. See Horizontal Ordinates for an explanation of the ordinate types.

Name: The user defined name of the designated coordinate system
Ordinate 1: The type of ordinate set for the first ordinate. (Available ordinates are X, Y, Distance, Direction, Station, Offset, Dx, Dy)
Ordinate 2: The type of ordinate assigned to ordinate 2.
Common Origin: If YES, the two ordinates have the same origin. If NO, the two ordinates are measured from different origins. For example, for a Station-Offset ordinate system where Common Origin is set to YES, the station and offset are both measured from the same alignment. If NO then the station is measured from one alignment and the offset is measured from a different alignment.
Icon: The icon displayed on the Civil AccuDraw toolbox. Usually a suitable icon is selected automatically, but you can define any icon.