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If you are trying to use a compass to get a polar alignment started, forget it. Too many things to upset them.
Easiest way is to take a solar noon alignment using a plumb bob. Find Solar noon time for your location ( it will be slightly diferent from the clock time ) and just mark the shadow of the plumb bob on the ground where you will set up. That will be exactly Nth Sth. You can get local Solar noon off the interweb, google is your friend.
Have fun and don't waste your money on magnetic compasses. A decent GPS is another option of course and you can use a star transit on the Nrth/Sth line as well but it's bit harder at night. Stellarium will tell you when a star crosses the line.
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