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Over the past century, the shift has been increasing in speed. It went from creeping as slow as nine miles per year in the early 1900s to more than 35 miles per year in the 2000s. However, that acceleration also is part of natural cycle, Love
Currently, the shift creates about a one-degree difference in compass direction every five years, Love said. Accordingly, the Federal Aviation Administration evaluates airport runway numbers every five years, said Kathleen Bergen, FAA spokeswoman.
Originally posted by goochball
Started a world map for us, hard to be very accurate at this scale though.
Feel free to update it. If you use photoshop you can use the custom shape tool to add your own blips. If you want to keep image format & quality, do File-----Save for web and devices----PNG-24
edit on 3/20/2011 by goochball because: map update
Aviation sectionals (maps / charts) and databases used for air navigation are based on True north rather than magnetic north, and the constant and significant slight changes in the actual location of magnetic north and local irregularities in the planet's magnetic field require that charts and databases be updated at least 2 times per year to reflect the current magnetic variation correction from True north. For example, as of March 2010, near San Francisco the magnetic north is about 14.3 degrees east of True north, with the difference decreasing by about 6 minutes of arc per year.
Fluctuations in the magnetic field have occurred in several far-flung regions of Earth, the researchers found.
In 2003 scientists found pronounced changes in the magnetic field in the Australasian region. In 2004, however, the changes were focused on Southern Africa.
The changes "may suggest the possibility of an upcoming reversal of the geomagnetic field," said study co-author Mioara Mandea, a scientist at the German Research Centre for Geosciences in Potsdam.
Originally posted by UberL33t
reply to post by MadDogtheHunter
Get enough readings...maybe you can define a border where normal magnetic north ends and this odd magnetic east as north begins. From there, perhaps there will be geological clues of the affected area.