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    Fwd: Why GPS Doesn't Work
    From: Tom Sult
    Date: 2020 Dec 18, 09:06 -0600
    GPS Jam and spoof has made IFR magazine. 

    In the post 9/11 world, security is clashing with utility and aviation is on the front lines, with consistent and reliable GPS signals at the center of the conflict.
    Why GPS Doesn't Work
    Dark clouds are looming on the horizon of our otherwise exciting GPS future. With increasing frequency, the military is jamming or spoofing GPS over huge swaths of airspace. A typical GPS NOTAM for Albuquerque center covers a radius of 237 NM at 10,000 feet, 207 NM at 400 feet and 165 NM at 50 feet daily for most of a week. Pilots in the Southwest have become accustomed to these NOTAMs, but they’re becoming more frequent and expanding to other areas of the country.

    Jamming is bad enough, but there’s been little talk of spoofing. GPS spoofing occurs when the GPS signal is replicated in a manner that provides incorrect location information. For example, at the Geneva Motor Show, a spoofing attack reported show-car locations, not in Geneva, but in Buckingham, England, in the year 2036.

    While that might seem cute, imagine flying the RNAV approach into Angel Fire, New Mexico. Five miles either side of center line on the initial segment from the west puts you in the mountains.

    GPS spoofing is insidious and doesn’t provide user clues like jamming does. We just don’t know. A report by RTCA found that GPS interference can affect most every system of a modern aircraft; ADS-B, GPS, TAWS, AHRS, communications, PFD/MFD, and ELT. Continue Reading

    Belvoir Publications, 535 Connecticut Ave , P.O. Box 5656, Norwalk, CT 06856, United States

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