Geomagnetic Anomaly Navigation in Tuareg Salt Caravan Traditions
图阿雷格盐商队传统中的地磁异常导航
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Caravans crossing the Tanezrouft desert rely on localized magnetic declination anomalies—mapped since the 12th century—to correct compass drift exceeding 18° in basalt-rich corridors.
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Salt merchants verify alignment by observing iron-rich sand dune crest orientations relative to stellar positions at magnetic midnight, not civil midnight.
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