Skip to content

Week 2026 / 41 · 2026-10-05 – 2026-10-11

Week 41 (5–11 October 2026): Integrity-drop measurements (consistent with GNSS degradation)

Indicative · based on ADS-B integrity (NIC) data

Affected aircraft-hour share

%3.8

▲ 0.7 pp vs previous week

Affected aircraft-hours

6,603

/ 175,140 aircraft-hours

Events

325

325 medium/high sufficiency

Position anomalies

202

high/medium-sufficiency events

Day by day

Each day's affected aircraft-hour share (%). Peak day in dark colour.

  • 3.1
    Mon
  • 3.8
    Tue
  • 4.3
    Wed
  • 3.4
    Thu
  • 3.4
    Fri
  • 4.4
    Sat
  • 3.9
    Sun

Last 12 weeks

Weekly share; this report is the highlighted point. Weeks without data are left blank.

%3%4.1

Highest FIRs

Regions with enough sample during the week, by affected aircraft share.

  • Ankara%9.4
  • Damascus%9.1
  • Bucharest%6.7
  • Sofia%5.6
  • Istanbul%5.3
  • Amman%4.3
  • Nicosia%3.1
  • Cairo%2.9

Cell map of the peak day · 2026-10-10

Each polygon is an H3 cell; “no data” does not mean calm.

  • Insufficient data
  • Low
  • Medium
  • High

Largest event of the week

Sofia

181

2026-10-07, 03–09 UTC, 7 hours in total. The number of unique affected aircraft is shown above.

Position anomalies (spoofing) · day by day

High- and medium-sufficiency events (rule-based, focus region only); high in dark colour.

  • 17
    Mon
  • 35
    Tue
  • 62
    Wed
  • 14
    Thu
  • 33
    Fri
  • 5
    Sat
  • 36
    Sun

Findings this week

  1. In the regional scope (Türkiye and neighbours), 3.77% (6,603) of 175,140 aircraft-hours over seven days showed degraded navigation integrity; the daily rate ranged from 3.05% to 4.38%. The peak day was 10 October (4.38%), followed by 7 October (4.35%). These data do not identify the cause of any rise or fall.
  2. Share of aircraft affected by region (weekly, FIRs with sufficient observation volume): Ankara 9.4%, Damascus 9.1%, Bucharest 6.7%, Sofia 5.6%, Istanbul 5.2%.
  3. The integrity-drop event affecting the most aircraft this week was on 7 October in the Sofia and Istanbul FIRs: 181 unique aircraft, 7 hours (03–09 UTC), 67 cells (event = connected medium/high-level cell-hours). All days of the week were produced with the same algorithm version (1.5.0), so the events are comparable with one another.
  4. Position anomalies (spoofing, rule-based, focus region): 202 high/medium-confidence events this week (202 high, 0 medium); busiest day 7 October (62). There are also 17 low-confidence events and 461 jumps overlapping with low integrity; jumps coinciding with integrity loss are not counted in this headline figure; the cause is not stated. Indicator only: it states no cause.
Data period, version and scope

This report was published on 15 October 2026 and rests on the published data of that day: regional scope (Türkiye and neighbours), algorithm 1.5.0 (a single affected-aircraft definition is used: a notable share of reports showing low integrity; faulty-transmitter filter applied). Earlier weekly reports may have been prepared with a different scope or algorithm version; reports must not be compared directly. The data come from a single source (adsb.lol); areas without receivers are invisible and “no data” does not mean “calm”. It is an indicator only: it states no cause and makes no definitive detection claim.

Open on the map

This report is based on observed ADS-B data and is not an operational navigation source. See the methodology page for the general framework.