Stephen, you can find a bit more on EQ6 setting circles if you have a look here, we discussed them earlier:
http://www.iceinspace.com.au/forum/s...etting+circles
http://www.iceinspace.com.au/forum/s...etting+circles
http://www.iceinspace.com.au/forum/s...etting+circles
It is important to remember that historically RA circle is essentially the Hour Angle circle.. but not quite as far as EQ6 is concerned. Here, it is meant to show RA, but this works only if tracking is ON all the time and provided the moving to another object is ALWAYS done manually, not with the help of the motors (slewing).
More details on this is available here:
http://en.wikipedia.org/wiki/Hour_angle
http://en.wikipedia.org/wiki/Spherical_astronomy
http://en.wikipedia.org/wiki/Setting_circles