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Hi Dutch,
the other thing you could do is mark your north-south line on the ground at solar noon, if you observe in the same spot every time. Just string up a plumb bob and wait for solar noon. When it's solar noon, trace the shadow of the string (attached to the plumb bob) onto the ground. That will be your true north-south line. The shadow may be a little on the short side so be as accurate as you can - use a 1m or longer ruler if you can.
Dean
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