Hi David Are you still having this issue? I had been having the exact issue some months back and it was driving me crazy. When I did a GOTO to a target, the scope would go to it and then track it really well. However once it had landed on the object, if I manually slewed it, the object will then start drifting, to the point that it went off the FOV. One day by mistake I pressed the MODE button after I had slewed manually, and hey ho, I heard the motors engage. It seems that when you manually slew to an object (or move around), tracking mode gets turned off. To turn it back on, once you have the object in FOV (centered hopefully), just press MODE and tracking will start. Let me know how it goes Hope this helps