GPS interference caused the FAA to reroute Texas air visitors. Experts stumped

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The Federal Aviation Administration is investigating the reason for mysterious GPS interference that, over the previous few days, has closed one runway at the Dallas-Fort Worth International Airport and prompted some plane in the area to be rerouted to areas the place alerts have been working correctly.

The interference first got here to mild on Monday afternoon when the FAA issued an advisory over ATIS (Automatic Terminal Information Service). It warned flight personnel and air visitors controllers of GPS interference over a 40-mile swath of airspace close to the Dallas-Fort Worth airport. The advisory learn partly: “ATTN ALL AIRCRAFT. GPS REPORTED UNRELIABLE WITHIN 40 NM OF DFW.”

John Wiseman

A dramatic impression

An advisory issued round the identical time by the Air Traffic Control System Command Center, in the meantime, reported the area was “experiencing GPS anomalies that are dramatically impacting” flights out and in of Dallas-Fort Worth and neighboring airports. It went on to say that a few of the airports have been counting on the use of navigation methods that predated GPS.

John Wiseman, an internet site that screens GPS interference in actual time, printed this map that confirmed the particular areas the place plane have been reporting unreliable GPS.

John Wiseman, the operator of, stated on Twitter that the interference appeared to start round 1 pm native time and ramped up over the subsequent a number of hours. He offered a time-lapse video that illustrates what he was speaking about.


GPS interference round DFW appears to have began round 1900Z – 2000Z/12 PM – 1 PM native time. The ATCSCC advisory was signed t 2151Z/2:51 PM native time if I did my math proper. The interference continues to be going.

— John Wiseman (@lemonodor) October 18, 2022

A day later, Wiseman reported that not solely was the interference persevering with, however that plane on the floor in the affected area have been additionally unable to obtain dependable GPS readings. What’s extra, fine-grained monitoring of the interference advised that army operations—the commonest supply of unintentional interference—weren’t taking part in a task. Several hours later, the unexplained issues not solely continued however had unfold to areas close to Waco.

High decision map of GPS interference round Dallas Fort Worth/DFW with sectional chart, together with knowledge from 2022-10-18 0000Z via 1600Z. It could be tough to interpret a better res map since you may begin to see results of particular person plane, flight routes and altitudes

— John Wiseman (@lemonodor) October 18, 2022

As mysteriously because it started, it stops

Then, round 11 pm Dallas time, the interference ended. As mysteriously as the interference started, it had stopped. In an internet interview, Wiseman wrote:

This GPS interference stood out as a result of it was vital, lined a comparatively giant space, and did not appear to be the typical interference I see in the United States which is nearly at all times clearly related to army testing or coaching in a army working space. My understanding is that lack of GPS is not an emergency for plane, however it might probably positively be annoying and lead to delays and even canceled flights. I do not know what caused this interference or whether or not it was intentional, nevertheless it virtually actually got here from a chunk of digital gear and never a pure phenomenon. GPS is type of a bizarre piece of the world’s infrastructure in that it is so vital, but additionally very straightforward to break via intentional or unintended jamming. I hope it continues to keep usable!

Civilian GPS depends on low-power satellite tv for pc alerts broadcast in the L band, a radio frequency vary that’s additionally utilized by civilian terrestrial radio sources, together with 5G cellular gadgets. That makes GPS prone to unintentional interference from the rollout of this next-generation know-how. Equipment used on army bases can also be a frequent trigger.

Typically, nevertheless, when unintentional interference happens, authorities can pinpoint the trigger inside a number of hours. On Wednesday, FAA officers stated in a press release: “The FAA is looking into reports of issues with GPS-guided approaches for one of Dallas-Fort Worth International Airport runways. The agency has found no evidence of intentional interference and is working to identify the cause. Aircraft are able to land safely on other runways.”


With no identified trigger, specialists can solely speculate.

“We don’t know if there are malicious actors behind this incident, or if it’s a result of interference,” Josh Lospinoso, co-founder and CEO of plane and transportation safety firm Shift5 and a former US Cyber Command official, stated in an interview. “Interference is a timely issue for airports and airlines right now. There was a big push by wireless carriers to roll out 5G in airports a few months ago that was a terrible idea from the perspective of how many legacy devices in aircraft rely on the wireless bands that are impeded by 5G.”

Lospinoso additionally famous the susceptibility civilian GPS to intentional spoofing and jamming. North Korea used GPS jamming in 2012. Three years in the past, the Center for Advanced Defense Studies reported that Russia had carried out intensive spoofing of alerts utilized by GPS and different Global Navigation Satellite Systems in Syria and different fight zones.

Other types of plane navigation are equally susceptible. In 2012, as an illustration, researcher Brad Haines reported that he was ready to spoof the ADS-B alerts a surveillance know-how plane depend on to decide their place through satellite tv for pc navigation. The researcher demonstrated how attackers may use these spoofed alerts to create “ghost planes” that would seem on air visitors controllers’ screens. Researchers have additionally devised a low-cost hack that spoofs the instrument touchdown methods that planes depend on to safely land.

This week’s occasion seems related to one which, in accordance to GPSWorld, performed out in Denver final January. In the January episode, plane in a 50-nautical-mile swath of airspace round the airport reported unreliable GPS for greater than 33 hours.

Readers ought to know that GPS interference isn’t life-threatening. But as famous, episodes like these do trigger cancellations, delays, and different inconveniences. More importantly, they underscore the frailty of a system that the world is rising more and more reliant on. More regarding than the interference itself is the thriller as to what caused it.


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