This document summarizes the main requirements for GBT Observe (GO),
the observer's User Interface for the GBT. In many areas, it simply
restates what has already been implemented. The major new topic
of
the document is to specify how the observing system should be configured
prior to starting the scan.
This document was reviewed by the GBT commissioning scientists,
together with members of the GBT M & C group and the authors, and
accepted on 19th December 2001.
