Magnetic pole shift means new Hillsboro runway name | OregonLive.com: "The slowly drifting location of Earth’s magnetic north pole means the Hillsboro Airport’s main runway underwent a name change early this week — from 12/30 to 13/31.
The new numbers were painted at one end of the runway early this week as part of general maintenance, said a spokeswoman for the Port of Portland, which owns and operates the airport.
Pilots and clients of the airport were mailed notices to be on the lookout for the runway work, but the airport was never shut down, as was rumored, said spokeswoman Kama Simonds.
Runways are designated according to the points on a compass, and the changing location of true magnetic north meant the runway sometimes is renamed.
Experts say magnetic north is slipping slowly from above the Arctic Ocean in a north-northwestern direction toward Siberia, at about 34.2 miles per year. When the magnetic points were recalibrated, Hillsboro, like some other airports, had to renumber its main runway."
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