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Ideally you need a star low in the east or west and then one near the meridian. Dont choose one too close to the horizon as there will be too much refraction. Stars in these positions will have most of their drift due to polar misalignment in either alt or az. Other position will tend to have a mix of both.
The east or west one will allow you to adjust your mounts altitude - if the star drifts south, lower the altitude adjustment
The star near the meridian shows you the azimuth adjustment required - if the star drifts north, you need to adjust the azimuth so the mount turns clockwise when viewed from above.
I use PHD to drift align, and I have worked out if thDEC graph drifts downwards when I am in the east, I need to raise the altitude, if it drifts downswards at the meridian, I need to twist the G11's azimuth adjustment downwards - but your mount may be different - its just how it helps me remember it
Adam
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