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Grady,
Sorry - I was mistaken - the dx and dy are pixels not arc seconds. You should get dx and dy movements in pixels from DSS. Your first (reference) sub should show 0 for dx and dy and if you order the images by time in DSS you should see dx and/or dy steadily increasing in each sub. If you take the last sub this will show the total drift over the entire imaging session. Divide each of these numbers by the total integrated imaging time in minutes and you get drift in pixels per minute.
Rob,
You can go back and calculate your drift this way if you keep your old subs - just load them up in deep sky stacker!
Peter
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