Next-Generation GPS
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The writers of your May 16 news story "Lockheed Wins GPS Satellite Contract" confused system accuracy with satellite precision. While Lockheed Martin's Steve Tatum cited the improved accuracy of the Global Positioning System, the article noted: "The military's new satellites will be harder to jam, more powerful and more accurate, making it easier for bombs to hit their targets in Afghanistan under heavy cloud cover and for tourists to get directions in Times Square." The GPS system may offer improved information accuracy with fewer errors and better data from multiple sources. The GPS satellites may provide repeatable data that are more precise with better measurements.
But no matter how precise the satellite data, only the integration of accurate information from a range of sources will allow accurate use of the GPS, whether for directions in Times Square or bombs in Afghanistan.
Or locating the Chinese Embassy in Belgrade.
MICHAEL B. TOTH
Oakton
