... Heathrow International Airport, the world's busiest, has now installed a permanent dual radar system called the Tarsier, which scans 3,658 meters of runway in search of junk 24 hours a day.

The Tarsier uses networked high-frequency, high-resolution radar and integrated digital signal processing to pinpoint anything from a pigeon to a cellophane sandwich wrapper (PDF).

Foreign object damage, or "FOD," is responsible for $60 million worth of damage a year, an average of $15,000 per aircraft for each major airline in the U.S. alone, according to the FAA (PDF).

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The smallest item detected to date is a 10-millimeter metal fitting in an area the size of 30 football fields, the company says. Once an object is found, Tarsier reports its latitude and longitude to within 3 meters via GPS.

This week the California State Automobile Association announce it would end its production of road maps due to falling demand. The slack will be picked up by the national Association. At the same time police and response organizations are warning the public and their staffs to keep a paper map on hand. What is happening to paper maps as GPS devices become part of our daily lives? Editors Adena Schutzberg and Joe Francica share their thoughts.