The local company does tours to Lodestone Reef several times a week.
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by the 12th century the Chinese were known to use the Lodestone compass for navigation.
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The earliest mention of a needle's attraction appears in a
work composed between 20 and 100 AD, the Lunheng(Balanced Inquiries):"A Lodestone attracts a needle.
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The earliest Chinese literature reference to magnetism lies in a 4th-century BC book
called Book of the Devil Valley Master(鬼谷子):"The Lodestone makes iron come or it attracts it.
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It makes sense to reject any magnetic signal that is too far away from the natural values because it most likely is from a magnetic anomaly-
a lighting strike, or Lodestone deposit in the ground, for example.