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Hi David,
Drift alignment is only needed for astrophtography, a quick polar alignment using the polar scope is good enough for visual.
Drift align is done by getting a rough polar alignment then tweaking the mount to stop any drift. you make the adjustments by moving the Alt and AZ of the mount itself not by the electronics or motors.
With any mechanical device ,a telescope mount in this case, there will be some
errors in the construction, even with a perfectly adjusted polar scope there will be some drift after a period of time. the idea of drift aligning is to keep the drift to a minimum for a short period of around 5mins.
The easiest way to get a good drift align is by using a webcam or other type of camera, using cross hairs on the comp screen watch the star and see if it drifts up or down or left or right.
these are the rules for drift aligning in the southern hemisphere.
cheers
David.
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