Linear and Radial gauge types use a common 2D Cartesian model space, which allows you to switch between them without loosing preferences for pointer offsets, axis docking, sizes etc. This model space is transformed to Cartesian or Polar view space (in the case of radial gauges). In polar space the x value results in an angle which is proportional to the sweep angle, whereas the Y value in model space translates to distance from the scale towards the circle center. The bigger the Y value the closer the coordinate to the center point. The following picture shows how a marker offset is preserved when switching from a radial to linear gauge type:

 

Throughout the documentation we will refer to the model space in order to highlight that a specific offset or distance is "transferable" between linear and radial gauges and vice versa.