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I use the Sun to check my compass first. To do this, put a stake in the ground and make sure it is vertical. Work out your local time for solar transit and at that time run a string line along the shadow line. This is a true North South line. You can now use this line to check your compass or to set up your mount. The accuracy of this method depends on how well you can locate yourself (a GPS helps here) and how well you can work out the local solar transit time (most astronomy ephemerides can do this for you).
Dennis.
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