Trends

Share of aircraft with severe GPS error (worse than 93 m), daily

A new day each morning. All panels share one scale, so levels compare directly.

Hollow dots mark days with under half an area's usual aircraft, when strong jamming may have taken aircraft off the map (why).

EGNOS area: 10 m-capable aircraft below 10 m, hourly

9–25 Oct 2025. The European SBAS service had an outage on 13–17 Oct; aircraft relying on it lost 10 m accuracy. An hour is flagged at 60% or more of capable aircraft across the service area. The baseline starts once five earlier days exist.

Northern US and southern Canada (43–55°N): 10 m-capable aircraft below 10 m

Hourly, 11–12 Nov 2025, against the same hours on two quiet days. The G4 storm peaked around 00–06Z on 12 Nov (Kp 8.7).

Same area: aircraft worse than 93 m

The severe-error measure on a 0–10% scale. It stays near zero through the storm: space weather degrades accuracy to tens of metres, rarely past 93 m.

Bay Area and Central Valley: aircraft with a 93 m-or-worse report, per minute

22 Sep 2026, 17:30–20:45 UTC, 35.5–38.5°N 123.5–119.5°W. Two bursts: about 18:00Z and 19:52–20:12Z. An FAA flight advisory (PMSRCA GPS 26-03) scheduled a Point Mugu Sea Range GPS test that day, 18:30–20:29Z, reaching well past the Bay Area: the second burst falls inside it, the first starts 22 minutes before it. Kp stayed at or below 1.7 all day.

Share of aircraft with severe GPS error (worse than 93 m), daily, 9–25 Oct 2025

Aircraft still degraded after leaving interference elsewhere are left out. Five known interference areas and one quiet high-latitude control; all panels share a 0–60% scale.

Over-representation among aircraft still degraded after leaving interference

9–25 Oct 2025, 4,025 aircraft-days on which an aircraft was still degraded after leaving interference. Ratio = a type's share of those days ÷ its share of all aircraft-days; 1× means in line with traffic. Types with at least 40 such days. A350s and A380s are shown apart, in grey: their high ratios most likely reflect how they report accuracy (they flag it as poor when a single satellite is marked degraded, and stay degraded longer; Validation), not lasting harm. Among the other types, long-haul widebodies stand out, which points to route exposure on the Gulf and Asia corridors.