The importance of obtaining calibration for astronomical data is undisputed. Certain operational modes increase the importance of standardised, automated calibration which can be carried out efficiently in the course of a night. Gemini have adopted a `flexible queue' approach to scheduling 50% of the available telescope time. This aims to match the programme observed to the prevailing conditions, and in so doing maximise the scientific output of the telescopes [1]. Three instruments are mounted on the telescope instrument support structure at one time, any or all of which may be used, and therefore must be calibrated, during a given night. Queued observations will be carried out in a `service' mode; the astronomer at the telescope will not be the Principle Investigator for the programme. The increased use of archives for astronomical research is another `observing' mode in which the astronomer using the data is removed from the process of taking that data or of specifying the way in which it is taken. Within the Gemini project, these additional demands on calibration have led to the development of a dedicated facility designed to provide calibration for all the Gemini Phase I instruments, with the flexibility to calibrate visiting instruments and future Gemini instruments.
  
Table 1: Phase I Instrumentation