Coordinate Systems Coordinate systems have improved in how you define and select them. Contents Using Numeric Values to Define Coordinate Systems In parts and assemblies, you can define coordinate systems by entering absolute numeric values for position and orientation. Selection for Coordinate Systems You can reference all parts of coordinate systems, such as planes, axes, and origin, in downstream features. For example, you can sketch on the XY plane of a coordinate system or use the Z axis of a coordinate system as the axis for a revolve feature. Parent topicParts and Features