GNSS interference around the Baltic Sea has been widely reported in recent years, affecting flights over Poland, the Baltic states, southern Sweden and Finland. Reports frequently point to the Kaliningrad region.
Last 24 hours: High· data up to · updated hourly
4.7%of area-hours with interference in the last 24 h (3,417 observed)
340of 613 areas affected in the last 7 days (188 severe)
99%highest share of affected aircraft in one area (7 days)
66aircraft with spoofing indications in the last 7 days (88 events)
Affected areas — last 7 days
Share of aircraft with degraded GNSS:2–5.0%5–10.0%10–20.0%20–35.0%35–50.0%50%+
Share of observed area-hours in which a notable share of aircraft reported degraded GNSS (≥ 2% of aircraft; dark part ≥ 10%).
Most affected day in this period: Thu 8 Oct (7.7% of area-hours severely affected).
Day (UTC)
Area-hours
Affected
Severe
Aircraft-hours
Mon 2 Nov
1,178
52 (4.4%)
51
19,462
Sun 1 Nov
3,022
152 (5.0%)
145
53,045
Sat 31 Oct
2,792
111 (4.0%)
106
47,252
Fri 30 Oct
3,779
183 (4.8%)
175
56,636
Thu 29 Oct
3,761
248 (6.6%)
239
57,689
Wed 28 Oct
3,509
186 (5.3%)
172
54,522
Tue 27 Oct
3,301
178 (5.4%)
172
51,706
How to read these figures
The region is divided into hexagonal areas of about 1,770 km². For every hour, the monitor checks which share of the aircraft in each area reported degraded GNSS integrity (NIC) via ADS-B. An area-hour counts as affected when that share exceeds the threshold and enough aircraft were present. Spoofing indications are impossible position jumps and large GNSS/barometric altitude differences. These are heuristic indicators — see how the map works for details and limitations.
