The Leica System 50 gets its corrections from the Corps of Engineers beacons (free) or you can sign up for an annual subscription and pick up corrections from the Racal satellite at a rate of approximately $800 per year.  You would need to order a special part with your GS50 system to read the satellite corrections.  Though the Corps beacons are free, they are not available everywhere, and coverage is typically up to about 100 miles from each beacon.  There are also line-of-sight issues, and you can “lose” the Corps beacons when in deep valleys, for example.  Typical accuracies are 0.3 to 1 meter horizontal and 1 to 2 meters vertical.  Configure Base, Configure Rover and Receiver Utilities do not apply, but the Localization command can be used to translate (1-point) or transform (multi-point) from the configured coordinate system to local coordinates.  It is still important, under Job Settings, GPS tab, to set the correct Transformation (eg. NAD83) and Zone (eg. KY North) so that the Lat/Longs are converted to coordinates on the local system.