Intermittent gaps in GPS coverage at flight altitudes are raising some new concerns about relying on one satellite system for aircraft navigation. Dick Arnold, who leads the FAA's GPS and navigation integrated product team, used the term ``worm holes'' to describe these coverage problems caused by ground-based interference. The phrase evokes an image of small gaps, which mainly appears to be the case, but the FAA has investigated at least one anomaly that covered hundreds of square ...

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