[bojan]

Hi Bruce,
I have non Go-To version...
The setting circles are accurate enough, to put the object into FOV. It may be a good idea to use vernier instead of just pointer (I am in a process of making one for myself actually). Also, take care about the direction, the supplied RA circle is more suitable for Northern hemisphere. Use the numbers that are further away from pointer (they go in opposite direction)
However, you have to be careful with RA circle, once it is calibrated (by pointing to the object of known coordinates and locked in place by small screws), the tracking must be kept ON all the time, otherwise the reference will be lost. Also, you should not use slewing at RA axis, because the same thing will happen.. If you do, you will need to re-calibrate it to correct position again after your object is in FOV (obviously, Synta wanted to make user's life easier by avoiding the need to manually convert RA into hour angle.. something that without encoders results in other problems)
However, unlock and manual push to desired position is OK.

You are correct about AN.

Also, consider Mel Bartel's software.. It can be used instead of Argo Navis, and it is freeware (you have to supply your own encoders).