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Field & Stream
Declination / Magnetic variation
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<blockquote data-quote="Stick" data-source="post: 535828" data-attributes="member: 3474"><p>Interesting article Oz and good to see that US / GB agencies are on top the current trend and adjusting nav systems accordingly.</p><p></p><p>Regular polarity flips have been observed in cross sections of the earth’s crust at the mid-atlantic ridge where new crust is created. This new rock takes on the polarity of the planet at the time that it’s created and recordings show that flips have occurred regularly throughout the earth’s history.</p><p></p><p>I shouldn’t imagine that it’d happen overnight, but nonetheless the effects of a complete polarity reversal would be enormous, from navigational aids to migrating species.</p></blockquote><p></p>
[QUOTE="Stick, post: 535828, member: 3474"] Interesting article Oz and good to see that US / GB agencies are on top the current trend and adjusting nav systems accordingly. Regular polarity flips have been observed in cross sections of the earth’s crust at the mid-atlantic ridge where new crust is created. This new rock takes on the polarity of the planet at the time that it’s created and recordings show that flips have occurred regularly throughout the earth’s history. I shouldn’t imagine that it’d happen overnight, but nonetheless the effects of a complete polarity reversal would be enormous, from navigational aids to migrating species. [/QUOTE]
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