Pole shift forces airport makeover

Cosmic Log - Pole shift forces airport makeover: "Tampa International Airport in Florida has closed its primary runway until Jan. 13 to change the numeric designations at each end, as well as the signage on taxiways leading to the runway. The Tampa Tribune said the runway had been designated 18R/36L, indicating its alignment along the 180-degree approach from the north and the 360-degree approach from the south. Now the numbers are being revised to read 19R/1L (190 degrees and 10 degrees).
Two other runways will be closed later this month for a similar signage change, the Tribune reported.
The changes are required by the Federal Aviation Administration, which wants the numeric designations to reflect magnetic-north headings to the nearest 10-degree increment."