Thread by @auonsson

The GPS-jammer affecting aircrafts around Estonia is located in Russia, about halfway to St Petersburg from Narva, Estonia.

This is shown by plotting the highest density of intersecting radio horizons of jammed aircrafts on a map.

Further, a drone-based method supports it.🧵

The GPS-jammer affecting aircrafts around Estonia is located in Russia, about halfway to St Petersburg from Narva, Estonia.

This can be shown by plotting the highest density of intersecting radio horizons of jammed aircrafts on a map.

Further, a drone-based method supports it.

This is a more zoomed in view of the likeliest position of the GPS-jammer operating around Estonia and recently famous for causing the brand new Helsinki - Tartu flight line to cease operating.

See this and linked posts for methodology.

https://x.com/auonsson/status/1776701617842073956

This took some time to make so I will continue the thread tomorrow with drones, more radio horizons and closer explanations.

Data available if interest is shown. Stay tuned.

I should add. The jammer over Estonia is very different in scope and temporal profile. A higher proportion of aircrafts are affected around Estonia and the jammer is almost always on. See plots.

Proportion measure (%) is a bit skewed during nights though, because there are so few planes in the air. And this effect is even stronger around Estonia. Plots show last months total number of observations for respective area.