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It's another two motors, would rely on the tripod/pier head being perfectly level, known local magnetic variation, and a CCD to confirm the alignment stars were where it though they should be.
Any magnetic compass is only as accurate as the variation you feed it. A bit of reo in the concrete or a nearby steel fence throws my Silva compass off about 5 degrees. Polar alignment needs better values than "S is over thataway".
With a bit of practice it doesn't take that long to polar align, at least for visual.
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