Right-click the button to chose the type of coordinates to display. The menu options are:
Relative : Displays coordinates relative to the point you most recently specified. This option is available only when you are specifying multiple points, distances or angles.
Absolute : Displays coordinates relative to the current UCS.
Geographic : Displays coordinates relative to the geographic coordinate system specified for the drawing. This option is available only if the drawing file contains geographical location data.
Specific : Updates coordinates only when you specify points.
Coordinates are updated continuously (default).
Coordinates are updated only when you specify points.