Enter current position of the Cassegrain autoguider probe in 
coordinates.
Format: PROBE <radius> <theta>
Defaults: None.
Parameters: The autoradial position in microns and the autotheta
position in millidegrees.
Keywords: None.
Examples: PROBE 10000 10000
Comments: These values can be read directly from the ICL mimic
display. If the 
coordinate is
incorrect, then spurious guiding corrections will be applied. Both
coordinates are needed for the AGVIEW command to work.