<ul><li>Researchers from Sandia National Laboratories and Ohio State University are testing a backup system to help aircraft navigate when GPS signals are lost.</li><li>The system uses signals from cell towers and non-GPS satellites as a backup to guide planes safely in situations where GPS is unavailable or compromised.</li><li>The team conducted experiments using antennas attached to a weather balloon floating 80,000 feet above New Mexico.</li><li>Preliminary findings indicate that the alternative signals, if strong enough, could provide important assistance to GPS and improve air travel safety.</li></ul>

Can cell phone signals help planes navigate without GPS?

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