GNSS quality: three regional observations from 30 October 2026

What is measured, and what is not

We publish one snapshot per region from the SatellAItes local collection archive on 30 October. All three use the same quality-rules-0.2.0 classification. Contact counts describe retained rows in each snapshot, not unique flights over a day. “Degraded quality” and “unknown” are classifications produced locally from reported ADS-B information.

For eligible recent ADS-B positions, NIC below 7 or NACp below 8 produces the degraded-quality classification. Normal quality requires both indicators to be known and meet those thresholds; other cases remain unknown. It is not a radio measurement, the percentage of territory jammed or proof of spoofing. Missing fields remain unknown. Contacts excluded from GNSS assessment are listed separately; quality counters must not be converted into jamming rates. The times below are provider observation times in UTC, not the time this page is read.

Switzerland

At 2026-10-30 09:55:27 UTC, the snapshot retains 133 contacts, including 133 with positions. Archived counters report 1 with degraded quality and 9 with unknown quality; 7 contacts are excluded from GNSS assessment. Snapshot identifier: c9e801bb-4d2d-49d0-ab8f-94be80d67869.

Snapshot scope: bounding box [5.8, 45.7, 10.7, 47.9] in degrees (west, south, east, north), with a provider circle centred at 46.8° N, 8.3° E and a radius of 180 nautical miles. The bounding box is a filter, not a guarantee of continuous coverage.

Interpretation: this small degraded-quality count describes only contacts received at that instant. It does not certify normal ground-level GNSS reception throughout Switzerland.

Central Baltic

At 2026-10-30 10:00:37 UTC, the snapshot retains 109 contacts, including 109 with positions. Archived counters report 4 with degraded quality and 4 with unknown quality; 1 contact is excluded from GNSS assessment. Snapshot identifier: c2b788d0-de2e-4309-8fab-c55f6739becd.

Snapshot scope: bounding box [13, 52, 27, 60] in degrees (west, south, east, north), with a provider circle centred at 55.5° N, 20° E and a radius of 250 nautical miles. The bounding box is a filter, not a guarantee of continuous coverage.

Interpretation: the four degraded-quality contacts warrant checking time and location in the map, not automatically attributing jamming or spoofing. A single snapshot does not establish a persistent anomaly.

Eastern Mediterranean

At 2026-10-30 09:50:14 UTC, the snapshot retains 73 contacts, including 73 with positions. Archived counters report 1 with degraded quality and 0 with unknown quality; 0 contacts are excluded from GNSS assessment. Snapshot identifier: 5418081d-1903-4c17-9ab9-61aeb9ef690b.

Snapshot scope: bounding box [27, 31, 39, 40] in degrees (west, south, east, north), with a provider circle centred at 35.5° N, 33° E and a radius of 250 nautical miles. The bounding box is a filter, not a guarantee of continuous coverage.

Interpretation: this snapshot represents neither the entire Mediterranean basin nor all receivers in the area. One degraded-quality contact cannot locate a transmitter or identify the cause.

Why these counts do not rank the regions

The snapshots are roughly ten minutes apart and differ in area, traffic and coverage. Directly comparing 1, 4 and 1 therefore does not measure relative regional risk. A valid comparison would require common time windows, documented coverage, comparable samples and a stable method.

To continue in the map: select the area and interval, read sources and data freshness, then compare neighbouring observations and history. Keep the time window and limitations with every export. The GNSS guide explains the distinction between jamming, spoofing, satellite geometry and reported quality.

Sources, reuse and citation

Observation source: adsb.lol, under Open Database License 1.0. Selection, classification and commentary: SatellAItes. The aggregates, identifiers, dates and boundaries used in this analysis are downloadable in the accompanying JSON file; this extract publishes no individual contact records.

Suggested citation: SatellAItes, “GNSS quality: three regional observations from 30 October 2026”, published 30 October 2026, adsb.lol snapshots, quality-rules-0.2.0 classification. Also credit adsb.lol and retain the ODbL notice when reusing the data. This page is a dated report: consult the map for observations available today.