FILE - In this July 10, 2010, a cockpit GPS shows the search area as scientists participate in a marine mammal/sea turtle survey flight related to the Deepwater Horizon oil spill on a National Oceanic... more 
FILE - In this July 10, 2010, a cockpit GPS shows the search area as scientists participate in a marine mammal/sea turtle survey flight related to the Deepwater Horizon oil spill on a National Oceanic and Atmospheric Administration twin otter DHC-6, over the Gulf of Mexico near the Chandeleur Islands off the Louisiana coast. About 40 percent of commercial and private planes rely on GPS navigation systems. In addition, the Federal Aviation Administration is in the middle of multi-billion-dollar program to upgrade the nation's air-traffic control system, which is based on World War II-era radar technology, to a GPS-based system. less 
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Associated Press | Photo By Gerald Herbert, file
Wed, Apr 6, 2011 5:21 PM EDT