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No need to use a compass to align the azimuth scale of your Dob. Check your favourite planetarium app for a bright star (or planet) not too high up that crosses the meridian at a convenient time, point the Dob at the object at that particular time and rotate the base to make your azimuth scale show 0 degrees. You can then mark the position of the Dob feet on the ground for future use.
Be sure the planetarium app is set up correctly (location and time zone).
Cheers
Steffen.
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