For the magnetic compass, I understand the theory behind dip error and the famous UNOS, what I'm a little confused over is in which headings does it lag and lead. The reason I ask is because the FAA publications (Instrument flying handbook pg. 5-13, PHAK pg. 8-26) say it leads in the north and lags in the south, while everywhere else says the opposite, it leads going through sough and lags in the north. What am I missing here?
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