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

Each line on the map is like a contour line but, instead of marking a uniform measurement of height, it marks a uniform measurement of magnetic variation.

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.