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There's a technique where you move the mount with your keypad (assuming you have one) back and forth in the RA axis. If you have drift, it will create a "V" shaped line. If you wait 10sec at the start, before slewing 20sec forward and 20sec backwards, you will get a bright blob on the V, so you can work out where the line started.
As you correct for drift, the two lines of the V come closer and closer together, before eventually becoming one straight line.
Obviously, the amount of drift demonstrated by this is dependant on your focal length.
It works quite well and only takes ~1minute per exposure.
DT
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