Readback—November 2024

IFR Staff

Thursday, November 07, 2024 at 08:00 AM ET

Verified

Key Takeaways:

GPS spoofing, though rare outside conflict zones, can be detected by unexpected jumps in GPS time and position, requiring verification with independent sources like an accurate wristwatch or VOR/DME.
Thorough pre-flight planning, especially for unfamiliar airfields, is crucial, and pilots should be prepared to make difficult but professional "No-Go" decisions based on their assessment.
Effective pilot communication on CTAF, including using N numbers for ADS-B Traffic, enhances safety, and while checklists may not be legally mandated for all GA aircraft, keeping them accessible is common sense.
Some instrument procedures, like holding patterns on hybrid approaches, can offer flexibility, allowing pilots to choose between GPS (e.g., 4-NM legs) or conventional terrestrial navigation (e.g., 1-minute legs).

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Spoofing Confusion

I enjoyed your “GPS Jamming, Spoofing” article in June 2024. Would you please expand on your comment that “GPS satellite spoofing attacks are often detected by a jump in the time reported from the GPS.”?

Where would I check to see if there was a “jump in the GPS time”? Does that mean that the time shown on the GPS status page won’t match the current time? We currently have a WAAS-enabled Garmin GNS 530 but are planning to upgrade the entire panel in six months.