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One set of scans, which uses magnetic variations, showed the 5 hectare site was surrounded by ditches.

Hailey had conducted two expeditions to make the measurements on which the map was based, and the hope was that this would open the way to using magnetic variation to measure longitude.

A magnetic variation shift greater than 3 degrees prompts the administration to make changes to published airport approaches, and to advise airports to make changes on their property.

Every five years, the Federal Aviation Administration tests magnetic variation and assigns the values that’ll be used in designating runways.

All the Arctic peoples had been thrown into panic, and so had the animals, not only by the fog and the magnetic variations but by unseasonal crackings of ice and stirrings in the soil.